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Full Discussion: Sorting files by size in another directory
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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LEARN ABOUT CENTOS

wrap-and-sort

WRAP-AND-SORT(1)					      General Commands Manual						  WRAP-AND-SORT(1)

NAME

       wrap-and-sort - wrap long lines and sort items in Debian packaging files

SYNOPSIS

       wrap-and-sort [options]

DESCRIPTION

       wrap-and-sort  wraps the package lists in Debian control files. By default the lists will only split into multiple lines if the entries are
       longer than 80 characters. wrap-and-sort sorts the package lists in Debian control files and all .install files. Beside that  wrap-and-sort
       removes trailing spaces in these files.

       This  script should be run in the root of a Debian package tree. It searches for control, control.in, copyright, copyright.in, install, and
       *.install in the debian directory.

OPTIONS

       -h, --help
	      Show this help message and exit.

       -a, --wrap-always
	      Wrap all package lists in the Debian control file even if the entries are shorter than 80 characters and could fit in one line line.

       -s, --short-indent
	      Only indent wrapped lines by one space (default is in-line with the field name).

       -b, --sort-binary-packages
	      Sort binary package paragraphs by name.

       -k, --keep-first
	      When sorting binary package paragraphs, leave the first one at the top.  Unqualified debhelper(7) configuration files are applied to
	      the first package.

       -n, --no-cleanup
	      Do not remove trailing whitespaces.

       -d path, --debian-directory=path
	      Location of the debian directory (default: ./debian).

       -f file, --file=file
	      Wrap  and sort only the specified file.  You can specify this parameter multiple times.  All supported files will be processed if no
	      files are specified.

       -v, --verbose
	      Print all files that are touched.

AUTHORS

       wrap-and-sort and this manpage have been written by Benjamin Drung <bdrung@debian.org>.

       Both are released under the ISC license.

DEBIAN
								 Debian Utilities						  WRAP-AND-SORT(1)
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