Awk practical tips

 
Awk 'nf'
 

Filter blank rows

 
Awk '! A [$0] ++'
 

Filter duplicate rows

 
Awk 'nf-= 2'
 

Filter out the last two columns

 
Awk 'a =! A'
 

Print odd rows

 
Awk '! (A =! A )'
 

Print even rows

 
Awk 'end {print Nr }'
 

Simulate WC-l

 
Awk 'in in {print "'\''"}'
 

Print single quotes. The quotation marks are followed by single quotes, and single quotes.

 
Awk 'in in {print "\""}'
 

Double quotation marks are printed, followed by double quotation marks.

 
Awk 'in in {rs = ""; FS = "\ n"} {print NF }'
 

Calculates the number of lines of each text segment based on an empty behavior.

 
Awk-VRS = "\ n"-vofs = "" '$1 = $1'
 

Based on the segmentation standard of each text segment of an empty behavior, a text segment is integrated into one line.

 
Awk '{A = $2; $2 = $4; $4 = A} 1'
 

Column exchange

 
Awk '/[^! -~] /'
 

Print rows containing Chinese Characters

 
Awk '/[! -~] /'
 

This will not be explained at the meeting. It is best to execute lang = C before executing this column.

 
Awk 'nf {A = $ NF} end {print }'
 

Print the last word in the last line

 
Awk '{print $1> "file"}' file
 

Only keep the first column of the file (Dangerous to directly modify the file content)

This article from the "lisp O & M path" blog, please be sure to keep this source http://lspgyy.blog.51cto.com/5264172/1543687

Awk practical tips