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Top Forums Programming [C language] system function print output when not expected. Post 302418465 by Corona688 on Tuesday 4th of May 2010 11:05:12 AM
Old 05-04-2010
Read the man page for system(). It does not return a string, it returns the status of the command, as an integer -- probably 0 most of the time, or nonzero on error. If you want to actually capture the output of the command, use popen, it opens a FILE stream you can read from.

Better yet, don't create external processes for things you can do inside C. See man gettimeofday and man ctime.
 

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pspp-dump-sav(1)						    PSPP Manual 						  pspp-dump-sav(1)

NAME
pspp-dump-sav - dissect SPSS system file SYNOPSIS
pspp-dump-sav [-d | --data[=maxcases]] file... pspp-dump-sav --help | -h pspp-dump-sav --version | -v DESCRIPTION
The pspp-dump-sav program reads each SPSS system file file and prints its contents. The output format is useful for debugging system file readers and writers and for discovering how to interpret unknown or poorly understood records. End users may find the output useful for providing the PSPP developers information about system files that PSPP does not accurately read. OPTIONS
-d[maxcases] --data[=maxcases] By default, pspp-dump-sav does not print any of the data in a system file, only the file headers. Specify this option to print the data as well. If maxcases is specified, then it limits the number of cases printed. -h --help Prints a usage message on stdout and exits. -v --version Prints version information on stdout and exits. BUGS
Some errors that prevent files from being interpreted successfully cause pspp-dump-sav to exit without reading any additional files given on the command line. AUTHORS
Ben Pfaff and John Darrington. SEE ALSO
pspp(1), psppire(1). PSPP
January 2012 pspp-dump-sav(1)
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