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Full Discussion: Check for particular files and compare the file names
Top Forums Shell Programming and Scripting Check for particular files and compare the file names Post 302595264 by Corona688 on Thursday 2nd of February 2012 01:08:36 PM
Old 02-02-2012
Quote:
Yes, All the scripts of mine are perl.
Any particular reason? I wrote some really horrible perl scripts before I realized 99% of what I was doing was actually shell work, much simpler and more efficient in that language.

Code:
$ wc -l perl-backup.pl bash-backup.sh
  49 perl-backup.pl
  25 bash-backup.sh
  74 total
$

Anyway. That regex looks a lot more complicated than you need. Why match all the stuff you don't care about? Just match the things you want, and enough to know it's where it belongs, at the end.

Code:
#!/usr/bin/perl

my $FILE1="masterCSF242323.img";
my $FILE2="indexCSF242323.img";

$FILE1 =~ /([0-9]+)\.[^0-9]*$/;
$NUM1=$1;
$FILE2 =~ /([0-9]+)\.[^0-9]*$/;
$NUM2=$1;

 

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LEARN ABOUT X11R4

comm

COMM(1) 							   User Commands							   COMM(1)

NAME

       comm - compare two sorted files line by line

SYNOPSIS

       comm [OPTION]... FILE1 FILE2

DESCRIPTION

       Compare sorted files FILE1 and FILE2 line by line.

       When FILE1 or FILE2 (not both) is -, read standard input.

       With  no  options,  produce three-column output.  Column one contains lines unique to FILE1, column two contains lines unique to FILE2, and
       column three contains lines common to both files.

       -1     suppress column 1 (lines unique to FILE1)

       -2     suppress column 2 (lines unique to FILE2)

       -3     suppress column 3 (lines that appear in both files)

       --check-order
	      check that the input is correctly sorted, even if all input lines are pairable

       --nocheck-order
	      do not check that the input is correctly sorted

       --output-delimiter=STR
	      separate columns with STR

       --total
	      output a summary

       -z, --zero-terminated
	      line delimiter is NUL, not newline

       --help display this help and exit

       --version
	      output version information and exit

       Note, comparisons honor the rules specified by 'LC_COLLATE'.

EXAMPLES

       comm -12 file1 file2
	      Print only lines present in both file1 and file2.

       comm -3 file1 file2
	      Print lines in file1 not in file2, and vice versa.

AUTHOR

       Written by Richard M. Stallman and David MacKenzie.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report comm translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       join(1), uniq(1)

       Full documentation at: <http://www.gnu.org/software/coreutils/comm>
       or available locally via: info '(coreutils) comm invocation'

GNU coreutils 8.28						   January 2018 							   COMM(1)
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