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Rocky基础命令3
2022-07-05 12:45:00 【51CTO】
1、命令名称:ln
命令所在路径:/usr/bin/ln
执行权限:所有用户
语法:ln [-s] 源文件 链接
-s 建立软链接(类似windows里的快捷方式)
功能描述:建立链接文件(默认不加-s创建硬链接)
举例:
[[email protected] <sub>] #ln anaconda-ks.cfg a #创建硬链接,链接数会增加1
[[email protected] </sub>] #ll
total 12
-rw -- -- -- -. 2 root root 1438 Jul 2 10:43 a
-rw -- -- -- -. 2 root root 1438 Jul 2 10:43 anaconda-ks.cfg
-rw -r --r --. 1 root root 1728 Jul 2 10:52 initial-setup-ks.cfg
[[email protected] <sub>] #ln -s anaconda-ks.cfg b #创建软链接
[[email protected] </sub>] #ll
total 12
-rw -- -- -- -. 2 root root 1438 Jul 2 10:43 a
-rw -- -- -- -. 2 root root 1438 Jul 2 10:43 anaconda-ks.cfg
lrwxrwxrwx. 1 root root 15 Jul 4 20:54 b -> anaconda-ks.cfg
-rw -r --r --. 1 root root 1728 Jul 2 10:52 initial-setup-ks.cfg
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2、命令名称:tr
命令所在路径:/usr/bin/tr
执行权限:所有用户
语法: tr [-sdct] 第一个字符集 [第二个字符集]
-s 去重
-d 删除匹配 ”第一个字符集“ 的字符
-c 除去包含 ” 第一个字符集 “ 外的字符都将由 “ 第二个字符集” 的最后一个字符替换
-t 将 “第一个字符集 ” 替换为 “ 第二个字符集” ,位数按第一个字符集确定
功能描述:转换和删除字符
举例:
[[email protected] <sub>] #tr a-z A-Z
abcdefg
ABCDEFG
[[email protected] </sub>] #df
Filesystem 1K-blocks Used Available Use% Mounted on
devtmpfs 885060 0 885060 0% /dev
tmpfs 914116 0 914116 0% /dev/shm
tmpfs 914116 9300 904816 2% /run
tmpfs 914116 0 914116 0% /sys/fs/cgroup
/dev/sda2 31441920 5629848 25812072 18% /
/dev/sda1 506528 244712 261816 49% /boot
tmpfs 182820 0 182820 0% /run/user/0
[[email protected] <sub>] #df | tr -s ' ' %
Filesystem%1K-blocks%Used%Available%Use%Mounted%on
devtmpfs%885060%0%885060%0%/dev
tmpfs%914116%0%914116%0%/dev/shm
tmpfs%914116%9300%904816%2%/run
tmpfs%914116%0%914116%0%/sys/fs/cgroup
/dev/sda2%31441920%5629848%25812072%18%/
/dev/sda1%506528%244712%261816%49%/boot
tmpfs%182820%0%182820%0%/run/user/0
[[email protected] </sub>] #tr -d abc < /etc/fstab
#
# /et/fst
...
[[email protected] <sub>] #tr -t etc ETC < /etc/fstab
#
# /ETC/fsTab
# CrEaTEd by anaConda on SaT Jul 2 02:32:29 2022
...
[[email protected] </sub>] #tr -c wangdayu a
abcdefg
aaadaaga
[[email protected] <sub>] #tr -c wangdayu 0
wangxiaochun
wang00a000un0
[[email protected] </sub>] #tr -c wangdayu 011
wangxiaochun
wang11a111un1
[[email protected] ~] #tr -c wangdayu 011
wangxiaochun
wang11a111un1
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