Shell script Sed read one file and write to another only on the first occurrence of a string

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Shell script Sed read one file and write to another only on the first occurrence of a string

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#1 by (1 votes)
#2 by (0 votes)

1

Good afternoon,

I'm trying to read from an X file and write to a Y file when a specific String appears. But I just want to do the inclusion once. Example I'm trying to do:

sed -i '/, pasta/r teste.txt' Report.html

This command is reading all strings, "folder," and it is including the contents of the test.txt file underneath. But I want to make it include only the first occurrence of the string, "folder". A command like:

sed -i '0,/, pasta/r teste.txt' Report.html

The syntax above is wrong, how would it be correct to include the contents of the file only in the first occurrence of the string, "folder"?

linux shell-script terminal

asked by anonymous 01.12.2015 / 17:22

2 answers

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score 1 · Answer 1

If it's just to find an occurrence, without making substitutions, or if there are too many conditions for this match to be true, I'd use grep .

grep -o -a -m 1  -h  "pasta" teste.txt > report.html

Parameters:

-o = Show only the search word, if you remove it, show the entire line of the match.

-a = Process the file as if it were text.

-m 1 = Stop searching again after the first real match

-h = Does not show the name of the file where the match was found.

score 0 · Answer 2

perl -p0e  's/(, pasta)/"$1\n" . 'cat teste.txt'/e ' Report.html

that is: it replaces the first occurrence of " , pasta " by the result of

eval("$1\n" . 'cat teste.txt')

( perl -0 ... file loads the entire file; s/ / / only makes a substitution)