Script to add balise [img][/img] on each line of text linux?

Question

I just got a script who upload image file on to a web hoster; at the end I got a file with all the links (one link per line) and I would like to add [img] at the beginning of each link and [/img] at the end.

Answer 1

If you just want to add [img] to the start of each line in a file, and [/img] to the end, you could do that with awk like so:

awk '{ print "[img]" $0 "[/img]" }' infile >outfile

Or,

awk '{ printf("[img]%s[/img]\n", $0) }' infile >outfile

Answer 2

One way, with the stream editor, sed:

sed -e 's/^/[img]/' -e 's!$![/img]!' < input > output

Here I've changed the delimiter for the second search & replacement from / to ! so that the forward-slash in the replacement text doesn't need to be escaped. GNU sed would allow an in-place edit with the -i option:

sed -i -e 's/^/[img]/' -e 's!$![/img]!' input

Alternatively, you could edit the file in-place with ed:

ed -s input <<< $'1,$s/^/[img]/\n1,$s!$![/img]!\nw\nq'