awk.md

sed & awk

For command lines, the syntax is:

awk ’instructions’ files

using script file

awk -f scfl file 

variables

$0     — while document 
$1     — field one 
$2    — field two
...
...


awk regex 
awk ‘/pattern/‘ file 


awk '/line/' file                                     
second line                                                          
line three                                                           
line four                                                            
line five                                                            
line six     

adding command to the awk

iPad:~# awk '/line/' file                                     
second line                                                          
line three                                                           
line four                                                            
line five                                                            
line six                                                             
    

Imrans-iPad:~# awk '/line/{print }' file                           
line                                                                 
three                                                               
four                                                                 
five                                                                 
six                                                                  
Imrans-iPad:~# 

changing field seperator

Imrans-iPad:~# echo im/mm/jj | awk -F/ '/jj/{print $2}'              
mm   



multiple statements on data 

---

Imrans-iPad:~# echo '                                                

> imran,nazir,parray                                                 
> mubashir,mehraj,dar                                                
> zubair,fayaz,mir' | awk -F, '{print ;print }'                  

imran                                                                
parray                                                               
mubashir                                                           	
dar                                                                  
zubair                                                               
mir            

combining sed and awk

Imrans-iPad:~# cat ff                                                
l1 f1 f2 f3                                                          
l2 f1 f2 f3                                                          
l3 f1 f2 f3   

Imrans-iPad:~# cat ff | sed -e 's/1/one/' -e 's/2/two/'              
lone f1 ftwo f3                                                      
ltwo fone f2 f3                                                      
l3 fone ftwo f3                            
                      
Imrans-iPad:~# cat ff | sed -e 's/1/one/' -e 's/2/two/' | awk '{print $2}'                                                                
f1                                                                   
fone                                                                 
fone