CODEWITHSUNDEEP
unixawksed
Invictus
Invictus

Reputation: 4328

To modify a line that match start and mid part of a text in a line inplace

I have a file say Abc.txt . It consist of many lines. I want to use sed or may be any other command that modifies that line in place in that file. Suppose line has just one word like below

ABCDsdfg01klmn

Here I check if line starts with ABC and then check if it also has 00 and in that case I want to modify 01 by say PM . How can i do it ?

I want to add some further specific . I want it to be done only for lines that have say 4 character between ABCD and 01 . I dont want to modify it for lines say that has 3 characters or 5 characters between ABCD and 01 e.g ABCDsfg01klmn or ABCDsdfgh01klmn 

ABCDsdfgPMklmn

Upvotes: 0

Views: 34

Answers (1)

hek2mgl
hek2mgl

Reputation: 158020

With sed:

sed -r 's/^(ABCD.{4})01/\1PM/' file

If a line contains ABC plus 4 characters and a 01 the s command is used to replace 01 by PM.

Upvotes: 3

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