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Pamexec User Manual(0)							   Pamexec User Manual(0)

NAME
       pamexec - Execute a shell command on each image in a Netpbm image stream

SYNOPSIS
       pamexec

       ['command']

       [netpbmfile]

       [-check]

       Minimum	unique	abbreviation of option is acceptable.  You may use double hyphens instead
       of single hyphen to denote options.  You may use white space in place of the  equals  sign
       to separate an option name from its value.

DESCRIPTION
       This program is part of Netpbm(1)

       pamexec	reads  a Netpbm image stream as input.	For each image, it runs a specified shell
       command and supplies the image to it as Standard Input (with a pipe).

       netpbmfile is the file name of the input file, or  -  to  indicate  Standard  Input.   The
       default is Standard Input.

       Many  Netpbm programs understand multimage Netpbm streams themselves, so you don't need to
       use pamexec to run the program on the images in the stream.  Ideally, all Netpbm  programs
       would  have that capability, but multi-image streams are a relatively recent invention, so
       older Netpbm programs just process the first image in the  stream  and  then  stop.   Even
       recently  written  Netpbm  programs  work  that way, since the authors aren't aware of the
       multi-image possibility.

       Another way to process a multi-image stream is to use pamsplit to explode it into multiple
       files, one image per file.  You can then process those files.

       To  run	your  command  on a subset of the images in the stream, use pampick to select the
       desired images from the input stream and pipe the result to pamexec.

OPTIONS
       -check This causes pamexec to exit without processing any further images  if  the  command
	      has a nonzero exit status.

APPLICATIONS
       To make an animated GIF movie:

	   pamexec pamtogif myvideo.ppm | gifsicle --multifile >myvideo.gif

LIMITATIONS
       pamexec	assumes all commands consume all of Standard Input.  If yours doesn't (perhaps it
       just exits when it's seen enough), you can buffer through a temporary file like this:

	   pamexec 'cat >/tmp/x; head -3 x' myvideo.ppm

HISTORY
       pamexec was new in Netpbm 10.56 (September 2011).

       Michael Pot wrote it, borrowing from pamsplit.

SEE ALSO
       pamfile(1) , pampick(1) , pampick(1) , pnm(1) , pam(1) , cat man page

netpbm documentation			  11 August 2011		   Pamexec User Manual(0)
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