CODEWITHSUNDEEP
linuxsed
Kumar
Kumar

Reputation: 29

Not getting an sed error

Im trying to append a line in a file using following sed command

    sed -i  's/id="1asda"/id="1asda"\n peer="120"/g' a.xml.

Now the problem is that even if I'm giving a wrong id, sed is not popping an error.How to get an error if the pattern is not found.

Upvotes: 0

Views: 32

Answers (2)

hek2mgl
hek2mgl

Reputation: 158050

I would suggest to use awk:

awk 'BEGIN{e=1}gsub(/foo1/, "bar",$0){e=0};1;END{exit e}' file

The above command will give you a return value of 1 if no substitution has been performed, otherwise 0.

Upvotes: 0

Andrea Corbellini
Andrea Corbellini

Reputation: 17761

sed is used to replace text. Having nothing to replace is not an error.

Use something like grep to check whether there's something to replace or not. For example:

if grep -q 'id="1asda"' a.xml
then
    sed -i  's/id="1asda"/id="1asda"\n peer="120"/g' a.xml
else
    echo 'nothing to do' >& 2
fi

Upvotes: 1

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