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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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版权声明
本文为[51CTO]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/186/202207051233060740.html

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Rocky basic command 3

1、 Command name ：ln

2、 Command name ：tr

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