[Sed Ignore Lines] #sed #ignore #regex #patterns

Sed Ignore Lines.bash

# imagine you have multiple lines (non-deterministically generated):
#
# server 127.0.0.1; other stuff
# server 127.2.2.2:2222; other stuff
#
# to replace the second line and not the first, you can use the /.../! syntax
# this says "as long as the first pattern doesn't match, go ahead and try the substitution"
#
# sed -i '/some_pattern_to_ignore/! s/some_pattern_to_match/the_replacement_for_the_match/g' /nginx.conf

sed -i '/server 127.0.0.1/! s/server [^:]\+:[^;]\+/server 127.0.0.1:9000/g' /nginx.conf