第二部分 Linux Shell高级编程技巧——第三章运行级别脚本介绍

逃离我推掉我的手 2022-03-11 09:56 253阅读 0赞

### 笔记 ###

#运行级别脚本介绍
    #准备工作
    #进入目录
    cd /home/wgb/shell
    #建立文件夹
    mkdir 0421
    #进入目录
    cd 0421
    
    #运行级别
    #运行级别目录
    #进入etc目录
    [root@localhost etc]# cd /etc
    #ls rc后按tab键，显示rc开头的文件或者目录
    [root@localhost etc]# ls rc
    rc          rc.news     rc1.d       rc4.d       
    rc.d        rc.sysinit  rc2.d       rc5.d       
    rc.local    rc0.d       rc3.d       rc6.d    
    #获得当前运行级别
    [root@localhost etc]# runlevel
    N 5
    #进入目录
    [root@localhost etc]# cd rc5.d
    #显示内容
    [root@localhost rc5.d]# ls
    K05innd            K50snmpd          S09isdn
    K05saslauthd       K50snmptrapd      S10network
    K09privoxy         K50tux            S12syslog
    K10psacct          K50vsftpd         S13irqbalance
    K12mailman         K54pxe            S13portmap
    K15httpd           K55routed         S14nfslock
    K15postgresql      K61ldap           S17keytable
    K16rarpd           K65identd         S20random
    K20bootparamd      K65kadmin         S24pcmcia
    K20iscsi           K65kprop          S25netfs
    K20netdump-server  K65krb524         S26apmd
    K20nfs             K65krb5kdc        S28autofs
    K20rstatd          K70aep1000        S55sshd
    K20rusersd         K70bcm5820        S56rawdevices
    K20rwalld          K74ntpd           S56xinetd
    K20rwhod           K74ups            S59hpoj
    K24irda            K74ypserv         S80sendmail
    K25squid           K74ypxfrd         S80spamassassin
    K28amd             K84bgpd           S85gpm
    K34dhcrelay        K84ospf6d         S90FreeWnn
    K34yppasswdd       K84ospfd          S90canna
    K35atalk           K84ripd           S90crond
    K35dhcpd           K84ripngd         S90cups
    K35vncserver       K85zebra          S90xfs
    K35winbind         K90isicom         S91smb
    K36lisa            K95firstboot      S95anacron
    K40mars-nwe        S00microcode_ctl  S95atd
    K45arpwatch        S03vmware-tools   S95jexec
    K45named           S05kudzu          S97rhnsd
    K45smartd          S08ip6tables      S99local
    K46radvd           S08ipchains       S99mdmonitor
    K50netdump         S08iptables
    #S和K表示当前级别下的脚本 S：被启动 K：被终止
    #列出详细信息，指向init.d目录下的对应文件
    [root@localhost rc5.d]# ls -al
    total 8
    drwxr-xr-x    2 root     root         4096 Nov 26 09:42 .
    drwxr-xr-x   10 root     root         4096 Nov 24 10:38 ..
    lrwxrwxrwx    1 root     root           14 Sep 21  2011 K05innd -> ../init.d/innd
    lrwxrwxrwx    1 root     root           19 Sep 21  2011 K05saslauthd -> ../init.d/saslauthd
    lrwxrwxrwx    1 root     root           17 Sep 21  2011 K09privoxy -> ../init.d/privoxy
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 K10psacct -> ../init.d/psacct
    lrwxrwxrwx    1 root     root           17 Sep 21  2011 K12mailman -> ../init.d/mailman
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 K15httpd -> ../init.d/httpd
    lrwxrwxrwx    1 root     root           20 Sep 21  2011 K15postgresql -> ../init.d/postgresql
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 K16rarpd -> ../init.d/rarpd
    lrwxrwxrwx    1 root     root           20 Sep 21  2011 K20bootparamd -> ../init.d/bootparamd
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 K20iscsi -> ../init.d/iscsi
    lrwxrwxrwx    1 root     root           24 Sep 21  2011 K20netdump-server -> ../init.d/netdump-server
    lrwxrwxrwx    1 root     root           13 Sep 21  2011 K20nfs -> ../init.d/nfs
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 K20rstatd -> ../init.d/rstatd
    lrwxrwxrwx    1 root     root           17 Sep 21  2011 K20rusersd -> ../init.d/rusersd
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 K20rwalld -> ../init.d/rwalld
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 K20rwhod -> ../init.d/rwhod
    lrwxrwxrwx    1 root     root           14 Sep 21  2011 K24irda -> ../init.d/irda
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 K25squid -> ../init.d/squid
    lrwxrwxrwx    1 root     root           13 Sep 21  2011 K28amd -> ../init.d/amd
    lrwxrwxrwx    1 root     root           18 Sep 21  2011 K34dhcrelay -> ../init.d/dhcrelay
    lrwxrwxrwx    1 root     root           19 Sep 21  2011 K34yppasswdd -> ../init.d/yppasswdd
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 K35atalk -> ../init.d/atalk
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 K35dhcpd -> ../init.d/dhcpd
    lrwxrwxrwx    1 root     root           19 Sep 21  2011 K35vncserver -> ../init.d/vncserver
    lrwxrwxrwx    1 root     root           17 Sep 21  2011 K35winbind -> ../init.d/winbind
    lrwxrwxrwx    1 root     root           14 Sep 21  2011 K36lisa -> ../init.d/lisa
    lrwxrwxrwx    1 root     root           18 Sep 21  2011 K40mars-nwe -> ../init.d/mars-nwe
    lrwxrwxrwx    1 root     root           18 Sep 21  2011 K45arpwatch -> ../init.d/arpwatch
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 K45named -> ../init.d/named
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 K45smartd -> ../init.d/smartd
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 K46radvd -> ../init.d/radvd
    lrwxrwxrwx    1 root     root           17 Sep 21  2011 K50netdump -> ../init.d/netdump
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 K50snmpd -> ../init.d/snmpd
    lrwxrwxrwx    1 root     root           19 Sep 21  2011 K50snmptrapd -> ../init.d/snmptrapd
    lrwxrwxrwx    1 root     root           13 Sep 21  2011 K50tux -> ../init.d/tux
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 K50vsftpd -> ../init.d/vsftpd
    lrwxrwxrwx    1 root     root           13 Sep 21  2011 K54pxe -> ../init.d/pxe
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 K55routed -> ../init.d/routed
    lrwxrwxrwx    1 root     root           14 Sep 21  2011 K61ldap -> ../init.d/ldap
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 K65identd -> ../init.d/identd
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 K65kadmin -> ../init.d/kadmin
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 K65kprop -> ../init.d/kprop
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 K65krb524 -> ../init.d/krb524
    lrwxrwxrwx    1 root     root           17 Sep 21  2011 K65krb5kdc -> ../init.d/krb5kdc
    lrwxrwxrwx    1 root     root           17 Sep 21  2011 K70aep1000 -> ../init.d/aep1000
    lrwxrwxrwx    1 root     root           17 Sep 21  2011 K70bcm5820 -> ../init.d/bcm5820
    lrwxrwxrwx    1 root     root           14 Sep 21  2011 K74ntpd -> ../init.d/ntpd
    lrwxrwxrwx    1 root     root           13 Sep 21  2011 K74ups -> ../init.d/ups
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 K74ypserv -> ../init.d/ypserv
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 K74ypxfrd -> ../init.d/ypxfrd
    lrwxrwxrwx    1 root     root           14 Sep 21  2011 K84bgpd -> ../init.d/bgpd
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 K84ospf6d -> ../init.d/ospf6d
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 K84ospfd -> ../init.d/ospfd
    lrwxrwxrwx    1 root     root           14 Sep 21  2011 K84ripd -> ../init.d/ripd
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 K84ripngd -> ../init.d/ripngd
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 K85zebra -> ../init.d/zebra
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 K90isicom -> ../init.d/isicom
    lrwxrwxrwx    1 root     root           19 Sep 21  2011 K95firstboot -> ../init.d/firstboot
    lrwxrwxrwx    1 root     root           23 Sep 21  2011 S00microcode_ctl -> ../init.d/microcode_ctl
    lrwxrwxrwx    1 root     root           22 Oct 19  2012 S03vmware-tools -> ../init.d/vmware-tools
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 S05kudzu -> ../init.d/kudzu
    lrwxrwxrwx    1 root     root           19 Sep 21  2011 S08ip6tables -> ../init.d/ip6tables
    lrwxrwxrwx    1 root     root           18 Sep 21  2011 S08ipchains -> ../init.d/ipchains
    lrwxrwxrwx    1 root     root           18 Sep 21  2011 S08iptables -> ../init.d/iptables
    lrwxrwxrwx    1 root     root           14 Sep 21  2011 S09isdn -> ../init.d/isdn
    lrwxrwxrwx    1 root     root           17 Sep 21  2011 S10network -> ../init.d/network
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 S12syslog -> ../init.d/syslog
    lrwxrwxrwx    1 root     root           20 Sep 21  2011 S13irqbalance -> ../init.d/irqbalance
    lrwxrwxrwx    1 root     root           17 Sep 21  2011 S13portmap -> ../init.d/portmap
    lrwxrwxrwx    1 root     root           17 Sep 21  2011 S14nfslock -> ../init.d/nfslock
    lrwxrwxrwx    1 root     root           18 Sep 21  2011 S17keytable -> ../init.d/keytable
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 S20random -> ../init.d/random
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 S24pcmcia -> ../init.d/pcmcia
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 S25netfs -> ../init.d/netfs
    lrwxrwxrwx    1 root     root           14 Sep 21  2011 S26apmd -> ../init.d/apmd
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 S28autofs -> ../init.d/autofs
    lrwxrwxrwx    1 root     root           14 Sep 21  2011 S55sshd -> ../init.d/sshd
    lrwxrwxrwx    1 root     root           20 Sep 21  2011 S56rawdevices -> ../init.d/rawdevices
    lrwxrwxrwx    1 root     root           16 Sep 21  2011 S56xinetd -> ../init.d/xinetd
    lrwxrwxrwx    1 root     root           14 Sep 21  2011 S59hpoj -> ../init.d/hpoj
    lrwxrwxrwx    1 root     root           18 Sep 21  2011 S80sendmail -> ../init.d/sendmail
    lrwxrwxrwx    1 root     root           22 Sep 21  2011 S80spamassassin -> ../init.d/spamassassin
    lrwxrwxrwx    1 root     root           13 Sep 21  2011 S85gpm -> ../init.d/gpm
    lrwxrwxrwx    1 root     root           17 Sep 21  2011 S90FreeWnn -> ../init.d/FreeWnn
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 S90canna -> ../init.d/canna
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 S90crond -> ../init.d/crond
    lrwxrwxrwx    1 root     root           14 Sep 21  2011 S90cups -> ../init.d/cups
    lrwxrwxrwx    1 root     root           13 Sep 21  2011 S90xfs -> ../init.d/xfs
    lrwxrwxrwx    1 root     root           13 Sep 21  2011 S91smb -> ../init.d/smb
    lrwxrwxrwx    1 root     root           17 Sep 21  2011 S95anacron -> ../init.d/anacron
    lrwxrwxrwx    1 root     root           13 Sep 21  2011 S95atd -> ../init.d/atd
    lrwxrwxrwx    1 root     root           15 Nov 19 20:42 S95jexec -> ../init.d/jexec
    lrwxrwxrwx    1 root     root           15 Sep 21  2011 S97rhnsd -> ../init.d/rhnsd
    lrwxrwxrwx    1 root     root           11 Sep  8  2007 S99local -> ../rc.local
    lrwxrwxrwx    1 root     root           19 Sep 21  2011 S99mdmonitor -> ../init.d/mdmonitor
    #进入rc3.d目录
    [root@localhost rc5.d]# cd ../rc3.d
    #列出详细信息
    [root@localhost rc3.d]# ls -al
    total 8
    drwxr-xr-x    2 root     root         4096 Nov 26 09:42 .
    drwxr-xr-x   10 root     root         4096 Nov 24 10:38 ..
    lrwxrwxrwx    1 root     root           14 Sep  8  2007 K05innd -> ../init.d/innd
    lrwxrwxrwx    1 root     root           19 Sep  8  2007 K05saslauthd -> ../init.d/saslauthd
    lrwxrwxrwx    1 root     root           17 Sep  8  2007 K09privoxy -> ../init.d/privoxy
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 K10psacct -> ../init.d/psacct
    lrwxrwxrwx    1 root     root           17 Sep  8  2007 K12mailman -> ../init.d/mailman
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 K15httpd -> ../init.d/httpd
    lrwxrwxrwx    1 root     root           20 Sep  8  2007 K15postgresql -> ../init.d/postgresql
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 K16rarpd -> ../init.d/rarpd
    lrwxrwxrwx    1 root     root           20 Sep  8  2007 K20bootparamd -> ../init.d/bootparamd
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 K20iscsi -> ../init.d/iscsi
    lrwxrwxrwx    1 root     root           24 Sep  8  2007 K20netdump-server -> ../init.d/netdump-server
    lrwxrwxrwx    1 root     root           13 Sep  8  2007 K20nfs -> ../init.d/nfs
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 K20rstatd -> ../init.d/rstatd
    lrwxrwxrwx    1 root     root           17 Sep  8  2007 K20rusersd -> ../init.d/rusersd
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 K20rwalld -> ../init.d/rwalld
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 K20rwhod -> ../init.d/rwhod
    lrwxrwxrwx    1 root     root           14 Sep  8  2007 K24irda -> ../init.d/irda
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 K25squid -> ../init.d/squid
    lrwxrwxrwx    1 root     root           13 Sep  8  2007 K28amd -> ../init.d/amd
    lrwxrwxrwx    1 root     root           18 Sep  8  2007 K34dhcrelay -> ../init.d/dhcrelay
    lrwxrwxrwx    1 root     root           19 Sep  8  2007 K34yppasswdd -> ../init.d/yppasswdd
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 K35atalk -> ../init.d/atalk
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 K35dhcpd -> ../init.d/dhcpd
    lrwxrwxrwx    1 root     root           13 Sep  8  2007 K35smb -> ../init.d/smb
    lrwxrwxrwx    1 root     root           19 Sep  8  2007 K35vncserver -> ../init.d/vncserver
    lrwxrwxrwx    1 root     root           17 Sep  8  2007 K35winbind -> ../init.d/winbind
    lrwxrwxrwx    1 root     root           14 Sep  8  2007 K36lisa -> ../init.d/lisa
    lrwxrwxrwx    1 root     root           18 Sep  8  2007 K40mars-nwe -> ../init.d/mars-nwe
    lrwxrwxrwx    1 root     root           18 Sep  8  2007 K45arpwatch -> ../init.d/arpwatch
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 K45named -> ../init.d/named
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 K45smartd -> ../init.d/smartd
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 K46radvd -> ../init.d/radvd
    lrwxrwxrwx    1 root     root           17 Sep  8  2007 K50netdump -> ../init.d/netdump
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 K50snmpd -> ../init.d/snmpd
    lrwxrwxrwx    1 root     root           19 Sep  8  2007 K50snmptrapd -> ../init.d/snmptrapd
    lrwxrwxrwx    1 root     root           13 Sep  8  2007 K50tux -> ../init.d/tux
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 K50vsftpd -> ../init.d/vsftpd
    lrwxrwxrwx    1 root     root           13 Sep  8  2007 K54pxe -> ../init.d/pxe
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 K55routed -> ../init.d/routed
    lrwxrwxrwx    1 root     root           14 Sep  8  2007 K61ldap -> ../init.d/ldap
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 K65identd -> ../init.d/identd
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 K65kadmin -> ../init.d/kadmin
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 K65kprop -> ../init.d/kprop
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 K65krb524 -> ../init.d/krb524
    lrwxrwxrwx    1 root     root           17 Sep  8  2007 K65krb5kdc -> ../init.d/krb5kdc
    lrwxrwxrwx    1 root     root           17 Sep  8  2007 K70aep1000 -> ../init.d/aep1000
    lrwxrwxrwx    1 root     root           17 Sep  8  2007 K70bcm5820 -> ../init.d/bcm5820
    lrwxrwxrwx    1 root     root           14 Sep  7  2007 K74ntpd -> ../init.d/ntpd
    lrwxrwxrwx    1 root     root           13 Sep  8  2007 K74ups -> ../init.d/ups
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 K74ypserv -> ../init.d/ypserv
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 K74ypxfrd -> ../init.d/ypxfrd
    lrwxrwxrwx    1 root     root           14 Sep  8  2007 K84bgpd -> ../init.d/bgpd
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 K84ospf6d -> ../init.d/ospf6d
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 K84ospfd -> ../init.d/ospfd
    lrwxrwxrwx    1 root     root           14 Sep  8  2007 K84ripd -> ../init.d/ripd
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 K84ripngd -> ../init.d/ripngd
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 K85zebra -> ../init.d/zebra
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 K90isicom -> ../init.d/isicom
    lrwxrwxrwx    1 root     root           19 Sep  7  2007 K95firstboot -> ../init.d/firstboot
    lrwxrwxrwx    1 root     root           23 Sep  8  2007 S00microcode_ctl -> ../init.d/microcode_ctl
    lrwxrwxrwx    1 root     root           22 Oct 19  2012 S03vmware-tools -> ../init.d/vmware-tools
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 S05kudzu -> ../init.d/kudzu
    lrwxrwxrwx    1 root     root           19 Sep  8  2007 S08ip6tables -> ../init.d/ip6tables
    lrwxrwxrwx    1 root     root           18 Sep  8  2007 S08ipchains -> ../init.d/ipchains
    lrwxrwxrwx    1 root     root           18 Sep  8  2007 S08iptables -> ../init.d/iptables
    lrwxrwxrwx    1 root     root           14 Sep  8  2007 S09isdn -> ../init.d/isdn
    lrwxrwxrwx    1 root     root           17 Sep  8  2007 S10network -> ../init.d/network
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 S12syslog -> ../init.d/syslog
    lrwxrwxrwx    1 root     root           20 Sep  8  2007 S13irqbalance -> ../init.d/irqbalance
    lrwxrwxrwx    1 root     root           17 Sep  8  2007 S13portmap -> ../init.d/portmap
    lrwxrwxrwx    1 root     root           17 Sep  8  2007 S14nfslock -> ../init.d/nfslock
    lrwxrwxrwx    1 root     root           18 Sep  8  2007 S17keytable -> ../init.d/keytable
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 S20random -> ../init.d/random
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 S24pcmcia -> ../init.d/pcmcia
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 S25netfs -> ../init.d/netfs
    lrwxrwxrwx    1 root     root           14 Sep  8  2007 S26apmd -> ../init.d/apmd
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 S28autofs -> ../init.d/autofs
    lrwxrwxrwx    1 root     root           14 Sep  8  2007 S55sshd -> ../init.d/sshd
    lrwxrwxrwx    1 root     root           20 Sep  8  2007 S56rawdevices -> ../init.d/rawdevices
    lrwxrwxrwx    1 root     root           16 Sep  8  2007 S56xinetd -> ../init.d/xinetd
    lrwxrwxrwx    1 root     root           14 Sep  8  2007 S59hpoj -> ../init.d/hpoj
    lrwxrwxrwx    1 root     root           18 Sep  8  2007 S80sendmail -> ../init.d/sendmail
    lrwxrwxrwx    1 root     root           22 Sep  8  2007 S80spamassassin -> ../init.d/spamassassin
    lrwxrwxrwx    1 root     root           13 Sep  8  2007 S85gpm -> ../init.d/gpm
    lrwxrwxrwx    1 root     root           17 Sep  8  2007 S90FreeWnn -> ../init.d/FreeWnn
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 S90canna -> ../init.d/canna
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 S90crond -> ../init.d/crond
    lrwxrwxrwx    1 root     root           14 Sep  8  2007 S90cups -> ../init.d/cups
    lrwxrwxrwx    1 root     root           13 Sep  8  2007 S90xfs -> ../init.d/xfs
    lrwxrwxrwx    1 root     root           17 Sep  8  2007 S95anacron -> ../init.d/anacron
    lrwxrwxrwx    1 root     root           13 Sep  8  2007 S95atd -> ../init.d/atd
    lrwxrwxrwx    1 root     root           15 Nov 19 20:42 S95jexec -> ../init.d/jexec
    lrwxrwxrwx    1 root     root           15 Sep  8  2007 S97rhnsd -> ../init.d/rhnsd
    lrwxrwxrwx    1 root     root           11 Sep  8  2007 S99local -> ../rc.local
    lrwxrwxrwx    1 root     root           19 Sep  8  2007 S99mdmonitor -> ../init.d/mdmonitor
    #阿拉伯数字小先启动，大后启动
    
    
    
    
    # inittab
    #查看inittab文件内容
    [root@localhost etc]# cat inittab
    #
    # inittab       This file describes how the INIT process should set up
    #               the system in a certain run-level.
    #
    # Author:       Miquel van Smoorenburg, <miquels@drinkel.nl.mugnet.org>
    #               Modified for RHS Linux by Marc Ewing and Donnie Barnes
    #
    
    # Default runlevel. The runlevels used by RHS are:
    #   0 - halt (Do NOT set initdefault to this)
    #   1 - Single user mode
    #   2 - Multiuser, without NFS (The same as 3, if you do not have networking)
    #   3 - Full multiuser mode
    #   4 - unused
    #   5 - X11
    #   6 - reboot (Do NOT set initdefault to this)
    # 
    id:5:initdefault:
    
    # System initialization.
    si::sysinit:/etc/rc.d/rc.sysinit
    
    l0:0:wait:/etc/rc.d/rc 0
    l1:1:wait:/etc/rc.d/rc 1
    l2:2:wait:/etc/rc.d/rc 2
    l3:3:wait:/etc/rc.d/rc 3
    l4:4:wait:/etc/rc.d/rc 4
    l5:5:wait:/etc/rc.d/rc 5
    l6:6:wait:/etc/rc.d/rc 6
    
    # Trap CTRL-ALT-DELETE
    ca::ctrlaltdel:/sbin/shutdown -t3 -r now
    
    # When our UPS tells us power has failed, assume we have a few minutes
    # of power left.  Schedule a shutdown for 2 minutes from now.
    # This does, of course, assume you have powerd installed and your
    # UPS connected and working correctly.  
    pf::powerfail:/sbin/shutdown -f -h +2 "Power Failure; System Shutting Down"
    
    # If power was restored before the shutdown kicked in, cancel it.
    pr:12345:powerokwait:/sbin/shutdown -c "Power Restored; Shutdown Cancelled"
    
    
    # Run gettys in standard runlevels
    1:2345:respawn:/sbin/mingetty tty1
    2:2345:respawn:/sbin/mingetty tty2
    3:2345:respawn:/sbin/mingetty tty3
    4:2345:respawn:/sbin/mingetty tty4
    5:2345:respawn:/sbin/mingetty tty5
    6:2345:respawn:/sbin/mingetty tty6
    
    # Run xdm in runlevel 5
    x:5:respawn:/etc/X11/prefdm –nodaemon
    #作为服务器：默认为3
    #学会查看帮助信息
    #再次查看inittab文件
    [root@localhost etc]# cat inittab
    #
    # inittab       This file describes how the INIT process should set up
    #               the system in a certain run-level.
    #
    # Author:       Miquel van Smoorenburg, <miquels@drinkel.nl.mugnet.org>
    #               Modified for RHS Linux by Marc Ewing and Donnie Barnes
    #
    
    # Default runlevel. The runlevels used by RHS are:
    #   0 - halt (Do NOT set initdefault to this)
    #   1 - Single user mode
    #   2 - Multiuser, without NFS (The same as 3, if you do not have networking)
    #   3 - Full multiuser mode
    #   4 - unused
    #   5 - X11
    #   6 - reboot (Do NOT set initdefault to this)
    # 
    id:5:initdefault:
    
    # System initialization.
    si::sysinit:/etc/rc.d/rc.sysinit
    
    l0:0:wait:/etc/rc.d/rc 0
    l1:1:wait:/etc/rc.d/rc 1
    l2:2:wait:/etc/rc.d/rc 2
    l3:3:wait:/etc/rc.d/rc 3
    l4:4:wait:/etc/rc.d/rc 4
    l5:5:wait:/etc/rc.d/rc 5
    l6:6:wait:/etc/rc.d/rc 6
    
    # Things to run in every runlevel
    ud:once:/sbin/update
    #更改的内容
    #checkdisk::once:/sbin/checkdisk.sh > /dev/console 2>&1
    # Trap CTRL-ALT-DELETE
    ca::ctrlaltdel:/sbin/shutdown -t3 -r now
    
    # When our UPS tells us power has failed, assume we have a few minutes
    # of power left.  Schedule a shutdown for 2 minutes from now.
    # This does, of course, assume you have powerd installed and your
    # UPS connected and working correctly.  
    pf::powerfail:/sbin/shutdown -f -h +2 "Power Failure; System Shutting Down"
    
    # If power was restored before the shutdown kicked in, cancel it.
    pr:12345:powerokwait:/sbin/shutdown -c "Power Restored; Shutdown Cancelled"
    
    
    # Run gettys in standard runlevels
    1:2345:respawn:/sbin/mingetty tty1
    2:2345:respawn:/sbin/mingetty tty2
    3:2345:respawn:/sbin/mingetty tty3
    4:2345:respawn:/sbin/mingetty tty4
    5:2345:respawn:/sbin/mingetty tty5
    6:2345:respawn:/sbin/mingetty tty6
    
    # Run xdm in runlevel 5
    x:5:respawn:/etc/X11/prefdm -nodaemon
    
    
    #启动应用程序
    #启动脚本分析
    #编辑文件
    [root@localhost rc3.d]# vi S90crond 
    #查看文件内容
    [root@localhost rc3.d]# cat S90crond 
    #! /bin/bash
    #
    # crond          Start/Stop the cron clock daemon.
    #
    # chkconfig: 2345 90 60
    # description: cron is a standard UNIX program that runs user-specified \
    #              programs at periodic scheduled times. vixie cron adds a \
    #              number of features to the basic UNIX cron, including better \
    #              security and more powerful configuration options.
    # processname: crond
    # config: /etc/crontab
    # pidfile: /var/run/crond.pid
    
    # Source function library.
    . /etc/init.d/functions
    
    RETVAL=0
    
    # See how we were called.
      
    prog="crond"
    
    start() {
            echo -n $"Starting $prog: "
            daemon crond
            RETVAL=$?
            echo
            [ $RETVAL -eq 0 ] && touch /var/lock/subsys/crond
            return $RETVAL
    }
    
    stop() {
            echo -n $"Stopping $prog: "
            killproc crond
            RETVAL=$?
            echo
            [ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/crond
            return $RETVAL
    }
    
    rhstatus() {
            status crond
    }
    
    restart() {
            stop
            start
    }
    
    reload() {
            echo -n $"Reloading cron daemon configuration: "
            killproc crond -HUP
            retval=$?
            echo
            return $RETVAL
    }
    
    case "$1" in
      start)
            start
            ;;
      stop)
            stop
            ;;
      restart)
            restart
            ;;
      reload)
            reload
            ;;
      status)
            rhstatus
            ;;
      condrestart)
            [ -f /var/lock/subsys/crond ] && restart || :
            ;;
      *)
            echo $"Usage: $0 {start|stop|status|reload|restart|condrestart}"
            exit 1
    esac
    
    exit $?
    #启动脚本
    service server start|stop|restart|…
    srcipt_name start|stop|restart
    #停止crond服务
    [root@localhost rc3.d]# service crond stop
    Stopping crond:                                            [  OK  ]
    #启动crond服务
    [root@localhost rc3.d]# service crond start
    Starting crond: ^[[A                                       [  OK  ]
    #重启crond服务
    [root@localhost rc3.d]# service crond restart
    Stopping crond:                                            [  OK  ]
    Starting crond:                                            [  OK  ]
    #查看crond服务状态
    [root@localhost rc3.d]# service crond status 
    crond (pid 3737) is running...
    #进入inti.d目录
    [root@localhost rc3.d]# cd ../init.d/
    #列出所有内容
    [root@localhost init.d]# ls
    FreeWnn     gpm         krb5kdc         portmap     smartd
    aep1000     halt        kudzu           postfix     smb
    amd         hpoj        ldap            postgresql  snmpd
    anacron     httpd       lisa            privoxy     snmptrapd
    apmd        identd      lpd             psacct      spamassassin
    arpwatch    innd        mailman         pxe         squid
    atalk       ip6tables   mars-nwe        radvd       sshd
    atd         ipchains    mdmonitor       random      syslog
    autofs      iptables    microcode_ctl   rarpd       tux
    bcm5820     irda        named           rawdevices  ups
    bgpd        irqbalance  netdump         rhnsd       vmware-tools
    bluetooth   iscsi       netdump-server  ripd        vncserver
    bootparamd  isdn        netfs           ripngd      vsftpd
    canna       isicom      network         routed      winbind
    cpqarrayd   jexec       nfs             rstatd      xfs
    crond       kadmin      nfslock         rusersd     xinetd
    cups        kdcrotate   nscd            rwalld      ypbind
    dhcpd       keytable    ntpd            rwhod       yppasswdd
    dhcrelay    killall     ospf6d          saslauthd   ypserv
    firstboot   kprop       ospfd           sendmail    ypxfrd
    functions   krb524      pcmcia          single      zebra
    [root@localhost init.d]# vi mysqld
    #编写自己的服务，然后放在init.d目录下，再在对应的启动级别下加入超链接即可实现当机器启动时完成对相应服务的启动

### 附图 ###

![1366547204_2864.jpg][]

![1366547216_9357.jpg][]

![1366547230_2456.jpg][]

![1366547247_8154.jpg][]

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   <td style="text-align:right; font-family:microsoft yahei; color:white; font-size:12px"> <a title="我的CSDN博客——HelloWorld" href="http://blog.csdn.net/Wentasy" rel="nofollow">@Wentasy</a> 博文仅供参考，欢迎大家来访。如有错误之处，希望批评指正。原创博文如需转载请注明出处，谢谢 :) [CSDN博客]</td> 
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[1366547204_2864.jpg]: https://img-my.csdn.net/uploads/201304/21/1366547204_2864.jpg
[1366547216_9357.jpg]: https://img-my.csdn.net/uploads/201304/21/1366547216_9357.jpg
[1366547230_2456.jpg]: https://img-my.csdn.net/uploads/201304/21/1366547230_2456.jpg
[1366547247_8154.jpg]: https://img-my.csdn.net/uploads/201304/21/1366547247_8154.jpg