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Homework and Emergencies Homework & Coursework Questions Sorting files by size in another directory Post 302900085 by TedFTW on Sunday 4th of May 2014 01:36:46 AM
Old 05-04-2014
Wrench Sorting files by size in another directory

1. The problem statement, all variables and given/known data:
I'm trying to use a directory path to enter a new directory and sort the files there. I'm using the language C with a system call in Unix to sort the files from smallest to largest.


2. Relevant commands, code, scripts, algorithms:
Code:
system("ls -al | sort -k5n >> tempfile.txt");

This command enters the sorted data into a temporary directory named tempfile.txt. Tempfile.txt is later deleted. But the command:
system("ls -al | sort -k5n");
sorts only the data in the current directory. I would like to be able to sort data in any directory entered into my program.



3. The attempts at a solution (include all code and scripts):
i've tried:
Code:
       sprintf(cmd, "cd %s", argv[PATH]);
       system(cmd);

to change directories before using the sort command. But this doesn't work. I do not know very much about the Unix language to create a command that changes directories and sorts the files it finds there.


4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):

University at Albany, Albany NY, United States, S.S. Ravi, CSI 402


Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).

Last edited by vbe; 05-04-2014 at 05:30 AM..
 

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SCANDIR(3)								 1								SCANDIR(3)

scandir - List files and directories inside the specified path

SYNOPSIS
array scandir (string $directory, [int $sorting_order = SCANDIR_SORT_ASCENDING], [resource $context]) DESCRIPTION
Returns an array of files and directories from the $directory. PARAMETERS
o $directory - The directory that will be scanned. o $sorting_order - By default, the sorted order is alphabetical in ascending order. If the optional $sorting_order is set to SCANDIR_SORT_DESCEND- ING, then the sort order is alphabetical in descending order. If it is set to SCANDIR_SORT_NONE then the result is unsorted. o $context - For a description of the $context parameter, refer to the streams section of the manual. RETURN VALUES
Returns an array of filenames on success, or FALSE on failure. If $directory is not a directory, then boolean FALSE is returned, and an error of level E_WARNING is generated. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.4.0 | | | | | | | $sorting_orderconstants were added. Any nonzero | | | value caused descending order in previous ver- | | | sions. So for all PHP versions, use 0 for ascend- | | | ing order, and 1 for descending order. An option | | | for SCANDIR_SORT_NONE behavior did not exist | | | prior to PHP 5.4.0. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 A simple scandir(3) example <?php $dir = '/tmp'; $files1 = scandir($dir); $files2 = scandir($dir, 1); print_r($files1); print_r($files2); ?> The above example will output something similar to: Array ( [0] => . [1] => .. [2] => bar.php [3] => foo.txt [4] => somedir ) Array ( [0] => somedir [1] => foo.txt [2] => bar.php [3] => .. [4] => . ) Example #2 PHP 4 alternatives to scandir(3) <?php $dir = "/tmp"; $dh = opendir($dir); while (false !== ($filename = readdir($dh))) { $files[] = $filename; } sort($files); print_r($files); rsort($files); print_r($files); ?> The above example will output something similar to: Array ( [0] => . [1] => .. [2] => bar.php [3] => foo.txt [4] => somedir ) Array ( [0] => somedir [1] => foo.txt [2] => bar.php [3] => .. [4] => . ) NOTES
Tip A URL can be used as a filename with this function if the fopen wrappers have been enabled. See fopen(3) for more details on how to specify the filename. See the "Supported Protocols and Wrappers" for links to information about what abilities the various wrappers have, notes on their usage, and information on any predefined variables they may provide. SEE ALSO
opendir(3), readdir(3), glob(3), is_dir(3), sort(3). PHP Documentation Group SCANDIR(3)
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