Post

linux(CentOS7) 命令操作

Posted Updated
By Cc 3 min read

前言

linux 系统架构

  1. 硬件
  2. 系统内核
  3. 命令解析器
  4. 上层应用程序

初认命令行

  • [当前用户@计算机名字~]#
  • [当前用户@计算机名字~]$

    #为 root 用户，$普通用户

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[root@Cc ~]# su yf
[yf@Cc root]$ su root
Password:
[root@Cc ~]#

bash Shell

别名

alias创建别名,unalias撤销别名

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[root@Cc ~]# alias cc='ls -l'
[root@Cc ~]# cc
total 24
drwxr-xr-x  2 root root 4096 Dec 11 22:44 Cc
drwxr-xr-x  7 root root 4096 Nov 22 19:56 FileRecv
drwxr-xr-x  5 root root 4096 Nov 28 11:45 fileWehChat
drwxr-xr-x 19 root root 4096 Mar  3 15:45 gogs-repositories
drwxr-xr-x 17 root root 4096 Mar 18 13:51 lichaocheng
drwxr-xr-x  2 root root 4096 Mar 18 08:57 supervisord.d
[root@Cc ~]# unalias cc
[root@Cc ~]# cc
cc: fatal error: no input files
compilation terminated.
[root@Cc ~]#

历史命令使用

  • !!

    上一个命令

  • 找出特定字符命令

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[root@Cc ~]# history | grep sou
 1050  history | grep sou
[root@Cc ~]#
  • ![num]
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 1050  history | grep sou
 1051  history | grep ps
 1052  ll
 1053  history
[root@Cc ~]# !1052
ll
total 24
drwxr-xr-x  2 root root 4096 Dec 11 22:44 Cc
drwxr-xr-x  7 root root 4096 Nov 22 19:56 FileRecv
drwxr-xr-x  5 root root 4096 Nov 28 11:45 fileWehChat
drwxr-xr-x 19 root root 4096 Mar  3 15:45 gogs-repositories
drwxr-xr-x 17 root root 4096 Mar 18 13:51 lichaocheng
drwxr-xr-x  2 root root 4096 Mar 18 08:57 supervisord.d
[root@Cc ~]#
  • 通配符使用

    多个字符、任意字符、范围查找、

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[root@Cc ~]# ls /opt/go*
/opt/gomod:
Gin

/opt/gopath:
bin  pkg  src
[root@Cc ~]#

[root@Cc ~]# ls /bin/l?
/bin/ld  /bin/ln  /bin/lp  /bin/ls
[root@Cc ~]#
[root@Cc ~]# ls [a-f]*
Cc:

fileWehChat:
2019-09  2019-10  2019-11
[root@Cc ~]# find /opt/ -name "cc"
/opt/lichaocheng.top/lichaocheng.top.server/.git/objects/cc
/opt/gopath/src/smtface/client_user_server/.git/objects/cc
/opt/gopath/src/google.golang.org/grpc/.git/objects/cc
/opt/client/bogl.lichaocheng.top/.git/objects/cc
[root@Cc ~]#

管道

标准输入输出

注意 ctrl+d结束

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[root@Cc ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
IPADDR=172.24.40.83
NETMASK=255.255.192.0
ONBOOT=yes
GATEWAY=172.24.63.253
[root@Cc ~]# cat
lcc
lcc
yf
yf
cc
cc
[root@Cc ~]#

输入重定向

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[root@Cc ~]# wc<  /etc/sysconfig/network-scripts/ifcfg-eth0
 5  5 87
[root@Cc ~]# cat<  /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
IPADDR=172.24.40.83
NETMASK=255.255.192.0
ONBOOT=yes
GATEWAY=172.24.63.253

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[root@Cc ~]# cat <<<EEE
EEE
[root@Cc ~]#
[root@Cc ~]# cat <<CC
> 第一个输入
> 第二个输入
> exit^C
[root@Cc ~]# cat <<CC
第一个输入
第二个输入
> 第三个输入
> -bash: warning: here-document at line 50 delimited by end-of-file (wanted `CC')
第一个输入
第二个输入

第三个输入
  • 正确的值追加到文件
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[root@Cc ~]#
[root@Cc RedHad]# ll
total 0
-rw-r--r-- 1 root root 0 Mar 23 21:59 readme.md
[root@Cc RedHad]# cat readme.md
[root@Cc RedHad]# ls -l ./ >>  readme.md
[root@Cc RedHad]# cat readme.md
total 0
-rw-r--r-- 1 root root 0 Mar 23 21:59 readme.md
DevOps, RedHad
System RedHad
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