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Homework and Emergencies Homework & Coursework Questions Sorting files by size in another directory Post 302900094 by Don Cragun on Sunday 4th of May 2014 05:36:13 AM
Old 05-04-2014
Each call to system() creates a separate shell execution environment. Once the commands given to a call to system() complete, that environment is gone.

So, if you call system two times:
Code:
    system("cd some_directory");
    system("ls -al | sort -k5n");

the first call will not affect the directory in which the second call is run. But, if you perform the cd and the ls and sort pipeline in the same call to system() as in:
Code:
    system("cd some_directory
        ls -al | sort -k5n");
                or
    system("cd some_directory; ls -al | sort -k5n");

then the cd command will affect the directory where the pipeline executes.

Do you want the primary sort key of your output to be the file size and the secondary sort key to be the file type? Would you prefer to sort the output with the primary sort key being the file size and the secondary sort key being the file name? Have you looked at all of the options that the ls utility accepts on your system? Do you need both ls and sort? Is there an option to ls that will sort the output by file size and file name instead of having the primary sort key be the file name? If that output is backwards, is there an option to reverse the order of the output produced by ls?
 

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oggz-sort(1)						      General Commands Manual						      oggz-sort(1)

NAME
oggz-sort -- Sort the pages of an Ogg file in order of presentation time. SYNOPSIS
oggz-sort [-o filename | --output filename ] filename oggz-sort [-h | --help ] [-v | --version ] Description oggz-sort sorts an Ogg file, interleaving pages in order of presentation time. It correctly interprets the granulepos timestamps of Ogg CELT, CMML, Dirac, FLAC, Kate, PCM, Speex, Theora and Vorbis bitstreams. Run oggz-known-codecs(1) for a full list of codecs known by the installed version of oggz. Some encoders produce files with incorrect page ordering; for example, some audio and video pages may occur out of order. Although these files are usually playable, it can be difficult to accurately seek or scrub on them, increasing the likelihood of glitches during playback. Players may also need to use more memory in order to buffer the audio and video data for synchronized playback, which can be a problem when the files are viewed on low-memory devices. Some older Ogg encoders also produce pages which incorrectly have granulepos timestamps recorded that shouldn't be: pages which have no completed packets must have a granulepos of -1. oggz-sort will correct such granulepos during the process of sorting. The tool oggz-validate can be used to check the relative ordering of packets in a file, and also to detect incorrect granulepos on pages with no completed packets. If either of these errors are reported, or use oggz-sort to fix the problem. Options oggz-sort accepts the following options: Miscellaneous options -o filename, --output filename Write output to the specified filename instead of printing it to standard output. -h, --help Display usage information and exit. -v, --version Output version information and exit. EXAMPLES
Correct the page ordering in broken.ogv: oggz sort -o fixed.ogv broken.ogv AUTHOR
Conrad Parker January 25, 2008; COPYRIGHT
Copyright (C) 2008 Annodex Association SEE ALSO
oggz-validate(1), oggz-merge(1), oggz-dump(1), oggz-diff(1), hogg(1) oggz-sort(1)
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