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Top Forums Programming Writing c code for who | sort | lp Post 33995 by S.P.Prasad on Wednesday 29th of January 2003 04:18:52 AM
Old 01-29-2003
I was just wondering that had the requirement been like this :
who | sort | lp 2> log.dat
then how would we modify the code you have written.Is it possible that the purpose can be attended without forking more processes.

How can we do ">" (redirection) of the output to a file using exec utility.
 

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APS2FILE(1)						    BSD General Commands Manual 					       APS2FILE(1)

NAME
aps2file -- printing to a file via apsfilter SYNOPSIS
aps2file [-D] [-Pqueue] [-Zoptions] [-ooutput] [input] aps2file [-h] DESCRIPTION
With aps2file you can direct the printer data generated by apsfilter(1) into an arbitrary file without the use of a spooler. OPTIONS
-h show help screen -D enable debug mode -Pqueue select a printer queue (different from the default one) -Zoptions use apsfilter command line options (comma-separated list) -ooutput direct data stream to output (default: stdout) input read data from input (default: stdin) Unlike printing with lpr(1), you can only use one input file at a time. Using aps2file is also the recommended way to create a debugging log of a failed printing attempt. If you include the -D flag, the apsfilter shell script will log every command and print it to stderr. To save the output for inclusion into a bug report, you should therefore use a command of the sort aps2file -D -o /dev/null [-P...] [-Z...] [input] 2> log.txt NOTES
aps2file only works correctly with entries in /etc/printcap that have been created by /usr/share/apsfilter/SETUP. FILES
/etc/printcap printer capability data base /usr/share/apsfilter/bin/apsfilter apsfilter script SEE ALSO
apsfilter(1), apsfilter-bug(1), apspreview(1), apsfilterrc(5), printcap(5) BUGS
See apsfilter software center - http://www.apsfilter.org/ - for new versions, bugfixes and known bugs. Please use the new tool apsfilter-bug(1) to release bug- or problem reports. It automatically presents you a form in an editor window which asks you some standard questions. If you save and quit the editor session, then this report is sent automatically via e-mail to the proper apsfilter mailinglist. If apsfilter fails to print something or prints it in a way you wouldn't expect and you want to report an apsfilter error then please save the debugging output of one print session using the new aps2file(1) utility by typing aps2file -D -Z options file > /dev/null 2> file.debug and including the debugging output in the file file.debug into the edit session of the apsfilter-bug utility, so that it is included into the mail to the apsfilter mailinglist. Please note that you need to run /bin/sh (Bourne Shell), bash or a compatible shell, so that the above mentioned output redirection works. Under C-shell (/bin/csh) or tcsh it would't work. If you don't know, then simply make sure you use the Bournce shell by typing /bin/sh or bash, then you should have no problems with redirection of stdout and stderr (> /dev/null 2> file.debug). DOCUMENTATION
See official apsfilter homepage http://www.apsfilter.org/handbook.html Apsfilter Handbook including the Frequently Asked Questions (FAQ) USER FORUM
Please send questions to the official apsfilter help channel apsfilter-help@apsfilter.org. The above section BUGS and the file HOWTO-BUGREPORTS tells you how to report bugs. If you want to know how to troubleshoot your apsfilter installation, please read the manpage aps2file(1) and apsfilter-bug(1) as well as the Apsfilter Handbook carefully. HISTORY
The aps2file manpage has been written by Michael LoBin <phallobst@web.de> and first appeared in apsfilter V 7.1.0. BSD
Dec 19, 2001 BSD
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