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How to remove only the first occurrence of a line in a file using sed

MOHAMED Published at Dev
33
MOHAMED

I have the following file

titi
tata
toto
tata

If I execute

sed -i "/tat/d" file.txt

It will remove all the lines containing tat. The command returns:

titi
toto

but I want to remove only the first line that occurs in the file containing tat:

titi
toto
tata

How can I do that?

devnull

You could make use of two-address form:

sed '0,/tat/{/tat/d;}' inputfile

This would delete the first occurrence of the pattern.

Quoting from info sed:

 A line number of `0' can be used in an address specification like
 `0,/REGEXP/' so that `sed' will try to match REGEXP in the first
 input line too.  In other words, `0,/REGEXP/' is similar to
 `1,/REGEXP/', except that if ADDR2 matches the very first line of
 input the `0,/REGEXP/' form will consider it to end the range,
 whereas the `1,/REGEXP/' form will match the beginning of its
 range and hence make the range span up to the _second_ occurrence
 of the regular expression.

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Please contact [email protected] to delete if infringement.

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