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Full Discussion: Setting a variable (need syntax help)
Top Forums UNIX for Dummies Questions & Answers Setting a variable (need syntax help) Post 302075020 by Slanter on Monday 29th of May 2006 01:25:15 PM
Old 05-29-2006
Setting a variable (need syntax help)
I need some syntax help (working in a bash shell)

I have a variable which is a filename with an extension, and I need to create another variable with the same name but a different extension

To explain, the input file should be called something like "filename.L1" and the output file should be "filename.GEO"

so here's what I've been typing, but it doesn't work:

input=filename.L1
output=echo $input | sed s/L1/GEO/g


can anybody tell me how I should do this?

-Brent.
 

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LEARN ABOUT MINIX

tgatoppm

tgatoppm(1)                                                   General Commands Manual                                                  tgatoppm(1)

NAME

       tgatoppm - convert TrueVision Targa file into a portable pixmap

SYNOPSIS

       tgatoppm [--alphaout={alpha-filename,-}] [--headerdump] tga-filename

DESCRIPTION

       Reads a TrueVision Targa file as input.  Produces a portable pixmap as output.

OPTIONS

       --alphaout=alpha-filename
              tgatoppm  creates  a PGM (portable graymap) file containing the alpha channel values in the input image.  If the input image doesn't
              contain an alpha channel, the alpha-filename file contains all zero (transparent) alpha values.  If you  don't  specify  --alphaout,
              tgatoppm does not generate an alpha file, and if the input image has an alpha channel, tgatoppm simply discards it.

              If you specify - as the filename, tgatoppm writes the alpha output to Standard Output and discards the image.

              See pnmcomp(1) for one way to use the alpha output file.

       --headerdump
              Causes the header information to be dumped to stderr.

       All options can be abbreviated to their shortest unique prefix.  Should really be in PNM, not PPM.

SEE ALSO

       ppmtotga(1), pnmcomp(1), ppm(5)

AUTHOR

       Partially based on tga2rast, version 1.0, by Ian J. MacPhedran.

       Copyright (C) 1989 by Jef Poskanzer.

                                                                   02 April 2000                                                       tgatoppm(1)
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