linux高级命令

淡淡的烟草味﹌ 2021-11-17 05:04 272阅读 0赞

1.查看内存和释放内存：

查看内存：free -m

释放内存：echo 1 > /proc/sys/vm/drop\_caches

2.查看用户和用户组：

cat /etc/passwd

结果如下：

root:x:0:0:root:/root:/bin/bash  
bin:x:1:1:bin:/bin:/sbin/nologin  
daemon:x:2:2:daemon:/sbin:/sbin/nologin  
adm:x:3:4:adm:/var/adm:/sbin/nologin  
lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin  
sync:x:5:0:sync:/sbin:/bin/sync  
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown  
halt:x:7:0:halt:/sbin:/sbin/halt  
mail:x:8:12:mail:/var/spool/mail:/sbin/nologin  
uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin  
operator:x:11:0:operator:/root:/sbin/nologin  
games:x:12:100:games:/usr/games:/sbin/nologin  
gopher:x:13:30:gopher:/var/gopher:/sbin/nologin  
ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin  
nobody:x:99:99:Nobody:/:/sbin/nologin  
dbus:x:81:81:System message bus:/:/sbin/nologin  
rpc:x:32:32:Rpcbind Daemon:/var/lib/rpcbind:/sbin/nologin  
vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin  
abrt:x:173:173::/etc/abrt:/sbin/nologin  
rpcuser:x:29:29:RPC Service User:/var/lib/nfs:/sbin/nologin  
nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/sbin/nologin  
haldaemon:x:68:68:HAL daemon:/:/sbin/nologin  
ntp:x:38:38::/etc/ntp:/sbin/nologin  
saslauth:x:499:76:Saslauthd user:/var/empty/saslauth:/sbin/nologin  
postfix:x:89:89::/var/spool/postfix:/sbin/nologin  
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin  
oprofile:x:16:16:Special user account to be used by OProfile:/home/oprofile:/sbin/nologin  
tcpdump:x:72:72::/:/sbin/nologin  
mysql:x:27:27:MySQL Server:/var/lib/mysql:/bin/bash  
apache:x:48:48:Apache:/var/www:/sbin/nologin  
zookeeper:x:498:498:ZooKeeper:/var/lib/zookeeper:/sbin/nologin  
mailnull:x:47:47::/var/spool/mqueue:/sbin/nologin  
smmsp:x:51:51::/var/spool/mqueue:/sbin/nologin  
solr:x:497:497:Solr:/var/lib/solr:/sbin/nologin  
hbase:x:496:496:HBase:/var/lib/hbase:/sbin/nologin  
hive:x:495:495:Hive:/var/lib/hive:/sbin/nologin  
sentry:x:494:494:Sentry:/var/lib/sentry:/sbin/nologin  
hdfs:x:493:492:Hadoop HDFS:/var/lib/hadoop-hdfs:/bin/bash  
yarn:x:492:491:Hadoop Yarn:/var/lib/hadoop-yarn:/bin/bash  
impala:x:491:490:Impala:/var/lib/impala:/bin/bash  
mapred:x:490:489:Hadoop MapReduce:/var/lib/hadoop-mapreduce:/bin/bash  
hue:x:500:500::/home/hue:/bin/bash

3. vim  撤销、回退操作：

u：撤销上一步的操作；

Ctrl+r：恢复上一步被撤销的操作。

转载于:https://www.cnblogs.com/mediocreWorld/p/11070632.html