line="password requisite /lib/security/$ISA/pam_cracklib.so
newline="password required /lib/security/$ISA/pam_cracklib.so
I need to maintain whitespace
perl -p -i -e s/"$line"/"$newline"/ file
That tosses out all kinds of errors
Modern regexp engines allow you to use an arbitrary char as the pattern
delimiter. If I've got slashes in my patterns, I tend to use # as the
delimiter, which allows you to avoid Leaning Toothpick Syndrome. Other people
may use | . # is visually distinctive and not as common as / in some
string-replace contexts, though:
perl -p -i -e 's#"$line"#"$newline"#' file
The | sits right under the \ on the keyboard, so it is easy to put into
scripts. The # may seem like a reasonable delimiter unless the lines
being read in have comments in them. In which case most files I've seen
use the # to denote a comment or a comment line...
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