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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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SORT(1) 						      General Commands Manual							   SORT(1)

NAME
sort - sort a file of ASCII lines SYNOPSIS
sort [-bcdfimnru] [-tc] [-o name] [+pos1] [-pos2] file ... OPTIONS
-b Skip leading blanks when making comparisons -c Check to see if a file is sorted -d Dictionary order: ignore punctuation -f Fold upper case onto lower case -i Ignore nonASCII characters -m Merge presorted files -n Numeric sort order -o Next argument is output file -r Reverse the sort order -t Following character is field separator -u Unique mode (delete duplicate lines) EXAMPLES
sort -nr file # Sort keys numerically, reversed sort +2 -4 file # Sort using fields 2 and 3 as key sort +2 -t: -o out # Field separator is : sort +.3 -.6 # Characters 3 through 5 form the key DESCRIPTION
Sort sorts one or more files. If no files are specified, stdin is sorted. Output is written on standard output, unless -o is specified. The options +pos1 -pos2 use only fields pos1 up to but not including pos2 as the sort key, where a field is a string of characters delim- ited by spaces and tabs, unless a different field delimiter is specified with -t. Both pos1 and pos2 have the form m.n where m tells the number of fields and n tells the number of characters. Either m or n may be omitted. SEE ALSO
comm(1), grep(1), uniq(1). SORT(1)
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