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Full Discussion: Run perl script on files in multiple directories
Top Forums Shell Programming and Scripting Run perl script on files in multiple directories Post 302432348 by durden_tyler on Thursday 24th of June 2010 08:53:07 PM
Old 06-24-2010
Quote:
Originally Posted by ad23
...
I want to run a Perl script on multiple files, with same name ("Data.txt") but in different directories (eg : 2010_06_09_A/Data.txt, 2010_06_09_B/Data.txt).

I know how to run this perl script on files in the same directory like:

Code:
for $i in *.txt
do
perl myscript.pl $i > $i.new
done

But my filenames are same, and they are in different directories. How to go about this?
...
.... <Shell script snipped> ...
a_programmer's shell for loop is far better.

Perl globbing example follows -

You can iterate through all files named "Data.txt" in the Perl program itself, thereby avoiding the shell's for loop.

Example of your Perl script "myscript.pl" -

Code:
#!/usr/bin/perl -w
...
while ($file = glob("<your_directory>/*/Data.txt")) {
  # Now you have the full path in $file.
  # Process it the way you want.
  # You can even create and write to "$file.new" thereby 
  # avoiding the shell's redirection operator.
  ... your code here
}

HTH,
tyler_durden
This User Gave Thanks to durden_tyler For This Post:
ad23
 

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LEARN ABOUT CENTOS

binfmt.d

BINFMT.D(5)							     binfmt.d							       BINFMT.D(5)

NAME

       binfmt.d - Configure additional binary formats for executables at boot

SYNOPSIS

       /etc/binfmt.d/*.conf

       /run/binfmt.d/*.conf

       /usr/lib/binfmt.d/*.conf

DESCRIPTION

       At boot, systemd-binfmt.service(8) reads configuration files from the above directories to register in the kernel additional binary formats
       for executables.

CONFIGURATION FORMAT

       Each file contains a list of binfmt_misc kernel binary format rules. Consult binfmt_misc.txt[1] for more information on registration of
       additional binary formats and how to write rules.

       Empty lines and lines beginning with ; and # are ignored. Note that this means you may not use ; and # as delimiter in binary format rules.

       Each configuration file shall be named in the style of program.conf. Files in /etc/ override files with the same name in /usr/lib/ and
       /run/. Files in /run/ override files with the same name in /usr/lib/. Packages should install their configuration files in /usr/lib/, files
       in /etc/ are reserved for the local administrator, who may use this logic to override the configuration files installed from vendor
       packages. All files are sorted by their filename in lexicographic order, regardless of which of the directories they reside in. If multiple
       files specify the same binary type name, the entry in the file with the lexicographically latest name will be applied.

       If the administrator wants to disable a configuration file supplied by the vendor, the recommended way is to place a symlink to /dev/null
       in /etc/binfmt.d/ bearing the same filename.

EXAMPLE

       Example 1. /etc/binfmt.d/wine.conf example:

	   # Start WINE on Windows executables
	   :DOSWin:M::MZ::/usr/bin/wine:

SEE ALSO

       systemd(1), systemd-binfmt.service(8), systemd-delta(1), wine(8)

NOTES

	1. binfmt_misc.txt
	   https://www.kernel.org/doc/Documentation/binfmt_misc.txt

systemd 208															       BINFMT.D(5)
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