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Full Discussion: Extract variables from filenames and output to file
Top Forums Shell Programming and Scripting Extract variables from filenames and output to file Post 302513478 by kevintse on Wednesday 13th of April 2011 10:24:08 AM
Old 04-13-2011
What I used in the one liner is called Regular Expression.
Code:
perl -pe  's/^.(\d{4})(\d{3}).*$/$1 $2/' data.txt

The slashes are just separators, the syntax is: s/Regex/replacement/
^ matches the very start of the string(a line in data.txt).
. matches a single character(any character).
(\d{4}) \d represents number from 0 to 9, 4 in the curly braces means the pattern will match 4 numbers, the outer braces capture the 4 numbers(yr you want), this is called a group in Regular Expression.
(\d{3}) is roughly the same as the previous pattern.
$1 $2 prints the 1st and 2nd groups captured by the pattern.

For your last question, yes, Perl can easily achieve what you want but may not be as easy as the previous command, shouldn't be complicated though
 

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LEARN ABOUT DEBIAN

gextractwinicons

GEXTRACTWINICONS(1)					      General Commands Manual					       GEXTRACTWINICONS(1)

NAME

       gExtractWinIcons - Extract cursors and icons from MS Windows compatible resource files

SYNOPSIS

       gextractwinicons -h
       gextractwinicons [options]

DESCRIPTION

       gExtractWinIcons  is  a	GTK+ utility to extract cursors, icons and png images from MS Windows compatible resource files (.exe, .dll, .ocx,
       .cpl and many others).

       To extract icons or cursors just to select a MS Windows compatible resource file and the contained resources will be shown. Select a desti-
       nation  directory  where  to  save  the selected resources, simply check the items to extract and press the save button to save them in the
       specified path.

OPTIONS

       This program follow the usual GNU command line syntax, with long options starting with two dashes (`-').  A summary of options is  included
       below.

       -h, --help
	      Show summary of options

       -d, --destination
	      Set destination folder for extracted resources

       -f, --filename
	      Set resources filename from which to extract the resources

       -r, --refresh
	      Automatically refresh the resources list if -f (--filename) was specified

AUTHORS

       gExtractWinIcons was written by Fabio Castelli <muflone@vbsimple.net>.

HOMEPAGE

       http://code.google.com/p/gextractwinicons/

								  January 3, 2010					       GEXTRACTWINICONS(1)
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