Sed command : how to replace if exists else just insert?

Asked 2012-10-22T14:53:53.207

I need to edit several lines in a file such that if a line begins with (av or avpgw) then replace these with new text, else just insert the new text in beginning.

How can I do this using sed ?

linux sed

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This might work for you (GNU sed):

sed -r 's/^av(pgw)?.*/replacement/;t;s/^/replacement /' file

answered 2012-10-22T15:10:24.153

Sed command : how to replace if exists else just insert?

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