Linux Scripting Learn A

• Linux Scripting Learning

• D: Delete rows that match the criteria

Sed ' 1,2d '/etc/fstab delete 1, 2 lines, show other rows

• P: The line that displays the print fit condition

Sed '/^\//p '/etc/fstab matches the display, plus the original, there will be 2 duplicate

Sed-n '/^\//p/etc/fstab displays the line that matches the print

• A: Add/string after the specified line

Sed '/^\//a \ #hello world '/etc/fstab \ #hello The world tested \# #都可以使用

• I \string: Add a new line before the specified line

  
  

• R file adds the contents of the specified file to the qualifying line

Sed ' 2r/etc/issue '/etc/fstab after the second line of the/etc/fstab file, add/etc/issue the entire file content

• The W file saves the row in the range specified by the address to the specified file using the method as above R
  

Sed '/oot/w/tmp/oot.txt '/etc/fstab find oot lines in/etc/fstab file, save to/tmp/oot.txt inside

• s/patten/string/modifier: Find and Replace, default to replace only the first time in each row by the pattern-matching string modifier

/patten/can use regular expressions

By default, the first string that is matched in each line

\ (\), \1 \2 can also be tried

• Sed ' s#\ (L.. e\) #\1r#g ' Sed.txt
  

L.. E:liek-->liker

Love-->lover

&: Reference pattern matches entire string

Sed ' s#1..e#&r#g

• G: Global Substitution

• I: Ignore case
  

Linux Scripting Learn A