Some useful notes:
Chart of similar operations with sed and awk
--------------------------------------------
string
======
sed "s/from/to/" awk '{sub("from","to"); print}'
sed "s/from/to/g" awk '{gsub("from","to"); print}'
sed "s/from/to/3" awk '{$0=gensub("from","to",3); print}'
regex
=====
sed "s/reg.*$/_&_/" awk '{sub(/reg.*$/, "_&_"); print}'
sed "s/reg[ex]/YY/g" awk '{gsub(/reg[ex]/, "YY"); print}'
sed "s/reg[ex]/ZZ/4" awk '{$0=gensub(/reg[ex]/, "ZZ", 4); print}'
awk variable "var"
==================
sed "s/bang/boom/" awk -v var="bang" '{sub(var,"boom");print}'
sed "s/.*=/equ/5" awk -v var=".*=" '{$0=gensub(var,"equ",5);print}'
DOS variable "XY" with awk variable "z"
=======================================
[DOSPROMPT] C:\path> set xy=bangg*
sed "s/%XY%/boom/" awk -v z="%XY" '{sub(z,"boom"); print}'
sed "s/%XY%/boom/g" awk -v z="%XY" '{gsub(z,"boom"); print}'
sed "s/%XY%/boom/5" awk -v z="%XY" '{$0=gensub(z,"boom",5); print}'
interval expression, \{M,N\}
============================
sed "s/fo\{3,8\}/bar/" awk --re-interval '{sub(/fo{3,8}/, "bar");print}'
sed "s/fo\{3,8\}/bar/g"
awk --re-interval -v a="fo{3,8}" '{gsub(a,"bar");print}'
or
awk --re-interval -v a="fo\{3,8\}" '{gsub(a,"bar");print}'
DOS variable "HI", awk variable "j" with interval expression
============================================================
[DOSPROMPT] C:\path> set hi=Whe\{2,7\}!*
sed "s/%hi%/Zow!/" awk --re-interval -v j="%hi" '{sub(j,"Zow!"); print}'
sed "s/%hi%/Zow!/g" awk --re-interval -v j="%hi" '{gsub(j,"Zow!");print}'
[DOSPROMPT] C:\path> REM ... using a disk file ...
[DOSPROMPT] C:\path> echo {$0=gensub(j,"Zow!",5); print} >myfile.awk
sed "s/%hi%/Zow!/5" awk --re-interval -v j="%hi" -f myfile.awk
--
compiled by Eric Pement
on 03/20/2001 07:11pm
[end-of-file]
Taken from: http://www.student.northpark.edu/pemente/awk/awk_sed.txt
Tuesday, July 3, 2007
sed and awk notes
Posted by kapla.hodot at 09:49
Labels: Shell Scripting
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