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Top Forums Shell Programming and Scripting extract string from file name between two underscores Post 302674405 by shamrock on Thursday 19th of July 2012 02:34:20 PM
Old 07-19-2012
The sed command looks at a line and filters out only the part that has this pattern "(number)x(number)" punctuated by underscores. So in this pattern
Code:
.*_\([0-9][0-9]*x[0-9][0-9]*\)_.*

the regex ".*_" is the entire line to the left of the first 300 as is the "_.*" to the right of the second 300. The [0-9][0-9]* filters out only numbers and the "x" and "_" are taken literally...
 

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ppmpat(1)						      General Commands Manual							 ppmpat(1)

NAME
ppmpat - make a pretty pixmap SYNOPSIS
ppmpat -gingham2|-g2|-gingham3| -g3|-madras|-tartan| -poles|-squig|-camo| -anticamo width height DESCRIPTION
Produces a portable pixmap of the specified width and height, with a pattern in it. This program is mainly to demonstrate use of the ppmdraw routines, a simple but powerful drawing library. See the ppmdraw.h include file for more info on using these routines. Still, some of the patterns can be rather pretty. If you have a color workstation, something like ppmpat -squig 300 300 | ppmquant 128 should generate a nice background. OPTIONS
The different flags specify various different pattern types: -gingham2 A gingham check pattern. Can be tiled. -gingham3 A slightly more complicated gingham. Can be tiled. -madras A madras plaid. Can be tiled. -tartan A tartan plaid. Can be tiled. -poles Color gradients centered on randomly-placed poles. May need to be run through ppmquant. -squig Squiggley tubular pattern. Can be tiled. May need to be run through ppmquant. -camo Camouflage pattern. May need to be run through ppmquant. -anticamo Anti-camouflage pattern - like -camo, but ultra-bright colors. May need to be run through ppmquant. All flags can be abbreviated to their shortest unique prefix. REFERENCES
Some of the patterns are from "Designer's Guide to Color 3" by Jeanne Allen. SEE ALSO
pnmtile(1), ppmquant(1), ppm(5) AUTHOR
Copyright (C) 1989 by Jef Poskanzer. 04 September 1989 ppmpat(1)
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