I have a file with:
q12 q25
q13 q15
q78 q13
q42 q54
q13 q12
q12 q74
q45 q25
I want to replace any 12 to 13 and any 13 to 12 :
q13 q25
q12 q15
q78 q12
q42 q54
q12 q13
q13 q74
q45 q25
how to do this with a simple command?
Add a comment
|
3 Answers
Using perl you could avoid making use of a placeholder string to perform the substitutions.
Create a hash of the transformations that are needed and perform a substitution:
perl -pe 'BEGIN{%h=("12" => "13", "13" => "12")} s/(12|13)/$h{$1}/g' inputfile
For your sample input, it'd produce:
q13 q25
q12 q15
q78 q12
q42 q54
q12 q13
q13 q74
q45 q25
Use the -i option to save the changes to the file in-place.
Comments
You could try something like :
sed "s/13/tmp/g;s/12/13/g;s/tmp/12/g" file
You could use -i option if you want to replace inside the file :
sed -i "s/13/tmp/g;s/12/13/g;s/tmp/12/g" file
2 Comments
zmo
and be sure that there's no legit
tmp in file. Also if you want to do it in place (from and to file), use the -i argument of sed.
Idriss Neumann
@zmo I've edited my answer in the same time ^^ (for the
-i option).You can try this:
perl -i.bak -ne '/12/ && !/13/ && s/12/13/g && print; /13/ && !/12/ && s/13/12/g && print; !/12/ && !/13/ && print ' file; cat file
q13 q25
q12 q25
q12 q15
q78 q12
q42 q54
q13 q74
q12 q74
q45 q25
