Re: how to deal with incorrect command line argument

... I want the program to report an error "warn" but continue and work with the correct argument.

In general, I find I have enough trouble when I try to guess what my programs should be doing; I certainly don't want my programs making those guesses!

However, in the spirit of giving good advice and then immediately undercutting it, you might look at Text::Levenshtein and related fuzzy string comparison modules; see Levenshtein distance. The strategy might be something like "look for all file names in a given directory with an L-D (or other match metric) less than a given threshold, then use the file name with the least distance if that name is unique".

>perl -wMstrict -le
"use Text::LevenshteinXS;
 ;;
 my $tyop = 'twst.html';
 for my $try (qw(test.html testb.html)) {
   my $d = distance($tyop, $try);
   print qq{'$tyop' < $d > '$try'};
   }
"
'twst.html' < 1 > 'test.html'
'twst.html' < 2 > 'testb.html'
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Re^2: how to deal with incorrect command line argument by marinersk (Priest) on Oct 31, 2013 at 11:50 UTC
`<speechless> </speechless>` [download] Um. Wow. I have some self-educational opportunities here, it seems.	[reply] [d/l]
Re^3: how to deal with incorrect command line argument by Anonymous Monk on Oct 31, 2013 at 15:11 UTC
Make sure to have paramedics standing by before you start juggling your swiss army chainsaws like this :).	[reply]
Re^4: how to deal with incorrect command line argument by marinersk (Priest) on Oct 31, 2013 at 19:35 UTC
LOL. Noted -- I'll be sure to aiariiighr . . . { static on the radio } . . .	[reply]
Re^2: how to deal with incorrect command line argument by muba (Priest) on Oct 31, 2013 at 21:23 UTC
The day that commands in the `rm` family start exposing that kind of behaviour, where not only they offer suggestions a la Google ("twst.htm doesn't exist - did you mean to rm test.htm instead?") but also assume that that's what I meant ("twst.htm doesn't exist, so I went out of my way for you and rm'ed test.html instead, which, hey, you only worked on for 8 hours straight and haven't backed up yet. You're welcome, bro.") I swear I'm never touching a computer again.	[reply] [d/l]
Re^3: how to deal with incorrect command line argument by marinersk (Priest) on Oct 31, 2013 at 21:30 UTC
ROFLSHIPMP OMG My wife is going to disown me I am laughing so hard. Nice way to end my PerlMonks day. Thank you!	[reply]