I have a file containing one function that can start either like this
function f1 () {
... or
function f1 ()
{
...
I'm trying to find a sed command that deletes one line in the first case and two lines in the second case. I tried using:
sed /function/,/{/d $file
but It's not working, how can I do it?
This might work for you (GNU sed):
sed '/^function f1 ()\s*{/d;N;//d;P;D' file
If a line contains the first required string, delete it.
Otherwise, append the following line and test it again.
If the match is true, delete both lines, otherwise print/delete the first and repeat.
N.B. The // match uses the last regexp entered and as \s* matches zero or more white space (which also includes newlines) the regexp is good for the deletion of either of the two required strings.
An alternative:
sed '/^function f1 ()[ \n]*{/d;N;//d;P;D' file