@ARGV and glob

lightoverhead has asked for the wisdom of the Perl Monks concerning the following question:

Dear Friends:

I just came up with this question, when I used @ARGV in my program and if I feed the program input files like "*.txt", such as perl program.pl *.txt, will this program automatically take all the "*.txt" file in the current directory and feed them to @ARGV?

It seems doing so. But I cannot find reference for this behavior.

Thank you

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Re: @ARGV and glob by Corion (Patriarch) on Aug 22, 2017 at 15:49 UTC
The expansion of wildcards on the command line has nothing to do with Perl. It is a feature of the shell you use. For example under Windows with the `cmd.exe` shell, no such automatic expansion of wildcards occurs.	[reply] [d/l]
Re^2: @ARGV and glob by lightoverhead (Pilgrim) on Aug 22, 2017 at 15:58 UTC
oh, I see. Which means the shell actually feeds perl program all the files with ".txt". Thank you for your clear answer.	[reply]
Re: @ARGV and glob by haukex (Archbishop) on Aug 22, 2017 at 16:23 UTC
But I cannot find reference for this behavior. As Corion said, this is a feature of the shell. See for example "Filename Expansion" (and the following "Pattern Matching") in the Bash Reference Manual; of course there are lots of other shells, but the basic behavior of `*` and `?` are pretty much the same almost everywhere. Under Windows, you can use Win32::Autoglob to emulate this behavior.	[reply] [d/l] [select]
Re: @ARGV and glob by ikegami (Patriarch) on Aug 22, 2017 at 18:59 UTC
It depends on the shell to which that command is passed. `cmd` and `PowerShell` will pass `.txt` `sh`, `csh` and their derivatives will expand the glob and pass multiple files names. (Their behaviour may vary when there are no matching file names. Some will pass `.txt`.)	[reply] [d/l] [select]
Re: @ARGV and glob by thanos1983 (Parson) on Aug 22, 2017 at 16:11 UTC
Hello lightoverhead, I think you are looking for File::Find::Rule. Sample of code using this module Re: reading files in @ARGV doesn't return expected output. Through the module you can specify multiple directories to recover file(s) and also multiple regex to recover different file(s). Hope this helps, BR. Seeking for Perl wisdom...on the process of learning...not there...yet!	[reply] [d/l] [select]