I was hoping that because I'm using in-line modification from the command line, that it could somehow be a 1-liner
REM Windows CMD prompt
perl -F: -e "$F[0] =~ s/-/_/g; print join(':',@F);"

[download]
# Linux/Unix/Cygwin shell
perl -F: -e '$F[0] =~ s/-/_/g; print join(":",@F);'

[download]

Disclaimer: Not tested.

Explanation: -F: turns on auto-split (-a) and auto-loop (-n) and sets the split character to ':'

In reply to Re^3: Repeated substitution on 1 side of a line only by RonW
in thread Repeated substitution on 1 side of a line only by dspivey

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