1Pamexec User Manual(0)                                  Pamexec User Manual(0)
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NAME

6       pamexec  -  Execute  a  shell  command  on each image in a Netpbm image
7       stream
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SYNOPSIS

11       pamexec
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13       ["command"]
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15       [netpbmfile]
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17       [-check]
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19       Minimum unique abbreviation of option is acceptable.  You may use  dou‐
20       ble  hyphens  instead  of single hyphen to denote options.  You may use
21       white space in place of the equals sign to separate an option name from
22       its value.
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DESCRIPTION

27       This program is part of Netpbm(1).
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29       pamexec  reads a Netpbm image stream as input.  For each image, it runs
30       a specified shell command and supplies the  image  to  it  as  Standard
31       Input (with a pipe).
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33       netpbmfile  is  the file name of the input file, or - to indicate Stan‐
34       dard Input.  The default is Standard Input.
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36       Many Netpbm programs understand multimage Netpbm streams themselves, so
37       you  don't  need to use pamexec to run the program on the images in the
38       stream.  Ideally, all Netpbm programs would have that  capability,  but
39       multi-image  streams are a relatively recent invention, so older Netpbm
40       programs just process the first image in  the  stream  and  then  stop.
41       Even  recently written Netpbm programs work that way, since the authors
42       aren't aware of the multi-image possibility.
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44       Another way to process a multi-image  stream  is  to  use  pamsplit  to
45       explode  it  into  multiple  files,  one  image per file.  You can then
46       process those files.
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48       To run your command on a subset  of  the  images  in  the  stream,  use
49       pampick to select the desired images from the input stream and pipe the
50       result to pamexec.
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OPTIONS

55       In addition to the options common to all programs  based  on  libnetpbm
56       (most notably -quiet, see
57        Common  Options  ⟨index.html#commonoptions⟩  ), pamexec recognizes the
58       following command line option:
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62       -check This causes pamexec  to  exit  without  processing  any  further
63              images if the command has a nonzero exit status.
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APPLICATIONS

69       To make an animated GIF movie:
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71           pamexec pamtogif myvideo.ppm | gifsicle --multifile >myvideo.gif
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LIMITATIONS

75       pamexec  assumes  all commands consume all of Standard Input.  If yours
76       doesn't (perhaps it just exits when it's seen enough), you  can  buffer
77       through a temporary file like this:
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79           pamexec "cat >/tmp/x; head -3 x" myvideo.ppm
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HISTORY

83       pamexec was new in Netpbm 10.56 (September 2011).
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85       Michael Pot wrote it, borrowing from pamsplit.
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SEE ALSO

90       pamfile(1), pampick(1), pamsplit(1), pnm(1), pam(1), cat man page
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DOCUMENT SOURCE

93       This  manual  page was generated by the Netpbm tool 'makeman' from HTML
94       source.  The master documentation is at
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96              http://netpbm.sourceforge.net/doc/pamexec.html
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98netpbm documentation            11 August 2011          Pamexec User Manual(0)