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In this way it doesn't have problems with filenames with spaces.
dsniff is general purpose password sniffer, it handles *lots* of different protocols, but it also handles tcp-style expressions for limiting analyzed traffic - so I can limit it to work on pop3 only.
works at least in bash. returns integer in range 0-32767. range is not as good, but for lots of cases it's good enough.
When using regex - there is no need to use -o and 2nd regex.
has the benefit of being a bit more cross-platform.
Safe for whitespaces in names.
Of course it requires import command, from imagemagick tools, but it's simpler to type, and imagemagick is usefull anyway.
As long as you have perl based rename. You can check:
=$ rename --help
Unknown option: help
Usage: rename [-v] [-n] [-f] perlexpr [filenames]
That's the good one.