日常作业2

左手的ㄟ右手 2022-06-07 00:55 214阅读 0赞

1、显示当前时间，格式为hh:mm:ss,并保存到文件time.txt文件中；

[root@localhost Desktop]# date +%T | tee time.txt
    21:37:23
    [root@localhost Desktop]# cat time.txt
    21:37:23

2、显示/etc/passwd文件的第15-18行内容；

[root@localhost Desktop]# head -n 18 /etc/passwd | tail -n 4 
    nobody:x:99:99:Nobody:/:/sbin/nologin
    dbus:x:81:81:System message bus:/:/sbin/nologin
    usbmuxd:x:113:113:usbmuxd user:/:/sbin/nologin
    vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin

[root@localhost Desktop]# sed -n '15,18p' /etc/passwd
    nobody:x:99:99:Nobody:/:/sbin/nologin
    dbus:x:81:81:System message bus:/:/sbin/nologin
    usbmuxd:x:113:113:usbmuxd user:/:/sbin/nologin
    vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin

3、显示/bin中文件包含大写字母的文件，保存到bin\_westos\_file.txt文件中，并统计个数显示到屏幕；  
![这里写图片描述][SouthEast]  
4、在student用户下查找/etc下passwd文件，屏蔽错误输出；

[student@localhost ~]$ find /etc -name passwd 2>/dev/null
    /etc/pam.d/passwd
    /etc/passwd

5、在student用户下查找/etc下passwd文件，正确输出保存到/tmp/westos.out 错误输出保存到/tmp/westos.err；

[student@localhost ~]$ find /etc -name passwd >/tmp/westos.out 2>/tmp/westos.err
    [student@localhost ~]$ cat /tmp/westos.err
    find: `/etc/dhcp': Permission denied
    find: `/etc/sudoers.d': Permission denied
    find: `/etc/selinux/targeted/modules/active': Permission denied
    find: `/etc/audisp': Permission denied
    find: `/etc/pki/CA/private': Permission denied
    find: `/etc/pki/rsyslog': Permission denied
    find: `/etc/audit': Permission denied
    find: `/etc/ntp/crypto': Permission denied
    find: `/etc/polkit-1/localauthority': Permission denied
    find: `/etc/lvm/backup': Permission denied
    find: `/etc/lvm/archive': Permission denied
    find: `/etc/lvm/cache': Permission denied
    find: `/etc/cups/ssl': Permission denied
    [student@localhost ~]$ cat /tmp/westos.out
    /etc/pam.d/passwd
    /etc/passwd

6、在student用户下查找/etc下passwd文件，显示命令输出并保存输出到/tmp/westos.all中；

[student@localhost ~]$ cat /tmp/westos.all
    /etc/pam.d/passwd
    /etc/passwd
    [student@localhost ~]$ find /etc -name passwd 2>&1 | tee /tmp/westos.all
    find: `/etc/dhcp': Permission denied
    /etc/pam.d/passwd
    find: `/etc/sudoers.d': Permission denied
    find: `/etc/selinux/targeted/modules/active': Permission denied
    find: `/etc/audisp': Permission denied
    find: `/etc/pki/CA/private': Permission denied
    find: `/etc/pki/rsyslog': Permission denied
    /etc/passwd
    find: `/etc/audit': Permission denied
    find: `/etc/ntp/crypto': Permission denied
    find: `/etc/polkit-1/localauthority': Permission denied
    find: `/etc/lvm/backup': Permission denied
    find: `/etc/lvm/archive': Permission denied
    find: `/etc/lvm/cache': Permission denied
    find: `/etc/cups/ssl': Permission denied
    [student@localhost ~]$ cat /tmp/westos.all
    find: `/etc/dhcp': Permission denied
    /etc/pam.d/passwd
    find: `/etc/sudoers.d': Permission denied
    find: `/etc/selinux/targeted/modules/active': Permission denied
    find: `/etc/audisp': Permission denied
    find: `/etc/pki/CA/private': Permission denied
    find: `/etc/pki/rsyslog': Permission denied
    /etc/passwd
    find: `/etc/audit': Permission denied
    find: `/etc/ntp/crypto': Permission denied
    find: `/etc/polkit-1/localauthority': Permission denied
    find: `/etc/lvm/backup': Permission denied
    find: `/etc/lvm/archive': Permission denied
    find: `/etc/lvm/cache': Permission denied
    find: `/etc/cups/ssl': Permission denied

[SouthEast]: /images/20220607/4ce9c016764a4dbfafec9347c975fca0.png