inplace editing - How to use Ruby's command line in-place-edit mode to remove lines from a text file -

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i've been long time perl user, , in perl can remove lines text files this:

perl -pi -e 'undef $_ if m/some-condition/' file.txt

i'm trying move scripting ruby, in-place-edit, wrote this:

ruby -pi -e '$_ = nil if $_ =~ /some-condition/' file.text

but instead nullified entire file. tried

ruby -pi -e 'nil if $_ =~ /some-condition/' file.text

but didn't anything.

any ideas?

ruby -pi -e '$_ = nil if $_ =~ /some-condition/' file.text

should correct. if doesn't work, problem in some-condition. demonstrate,

echo -e "a\nb\nc" > x ; ruby -pi -e '$_ = nil if $_ =~ /b/' x ; cat x

prints

a c

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