Hello All,

How to replace a string in nth line of a file using sed or awk.

For Ex: test.txt

Line 1 : TEST1 TEST2 TEST3
Line 2 : TEST1 TEST2 TEST3 TEST4
Line 3 : TEST1 TEST2 TEST3 TEST5
Line 4 : TEST1 TEST2 TEST3 TEST6
Line 5 : TEST1 TEST2 TEST3 TEST7

i want to go to 4th line of a file and replace the word TEST2 in that line with the word DEV2.

any suggestions will be helpful.

Thanks

Rahul

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Hey There,

For sed, you can just specify the line number, like substituting THIS for THAT on line 4:

sed 4s/THIS/THAT/

In Awk, I believe you can specify the NR variable to cherry-pick the line.

Best wishes,

MIke

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All 2 Replies

Hey There,

For sed, you can just specify the line number, like substituting THIS for THAT on line 4:

sed 4s/THIS/THAT/

In Awk, I believe you can specify the NR variable to cherry-pick the line.

Best wishes,

MIke

if TEST2 is the second field and no where else and you want to replace only that second field,

awk 'NR==4{$2="DEV"}1' file
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