I've been a long time perl user, and in perl you can easily remove lines from text files like this:
perl -pi -e 'undef $_ if m/some-condition/' file.txt
I'm trying to move my scripting to Ruby, which also does in-place-edit, so I wrote this:
ruby -pi -e '$_ = nil if $_ =~ /some-condition/' file.text
but that instead nullified the entire file. I then tried
ruby -pi -e 'nil if $_ =~ /some-condition/' file.text
but that didn't do anything.
Any ideas?
ruby -pi -e '$_ = nil if $_ =~ /some-condition/' file.text
should be correct. If it doesn't work, the problem is in some-condition. To demonstrate,
echo -e "a\nb\nc" > x ; ruby -pi -e '$_ = nil if $_ =~ /b/' x ; cat x
prints
a
c
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