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Rocky basic command 3
2022-07-05 13:11:00 【51CTO】
1、 Command name :ln
Command path :/usr/bin/ln
Executive authority : All users
grammar :ln [-s] Source file link
-s Build soft links ( similar windows Shortcuts in )
Function description : Create a link file ( The default without -s Create a hard link )
give an example :
[[email protected] <sub>] #ln anaconda-ks.cfg a # Create a hard link , The number of links will increase 1
[[email protected]8-1 </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 # Create soft link
[[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、 Command name :tr
Command path :/usr/bin/tr
Executive authority : All users
grammar : tr [-sdct] First character set [ Second character set ]
-s duplicate removal
-d Delete match ” First character set “ The characters of
-c Remove the containing ” First character set “ All characters outside will be written by “ Second character set ” Replace with the last character of
-t take “ First character set ” Replace with “ Second character set ” , The number of digits is determined by the first character set
Function description : Converting and deleting characters
give an example :
[[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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