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UNIX in a Nutshell: System V Edition

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UNIX Commands
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sort



sort

 [

options

] [

files

]

Sort the lines of the named files , typically in alphabetical order. See also uniq , comm , join .

Options

-b

Ignore leading spaces and tabs.

-c

Check whether files are already sorted, and if so, produce no output.

-d

Sort in dictionary order (ignore punctuation).

-f

"Fold"; ignore uppercase/lowercase differences.

-i

Ignore nonprinting characters (those outside ASCII range 040-176).

-m

Merge sorted input files.

-M

Compare first three characters as months.

-n

Sort in arithmetic order.

-o file

Put output in file .

-r

Reverse the order of the sort.

-t c

Fields are separated with c (default is any white space).

-u

Identical lines in input file appear only one ( u nique) time in output.

-y kmem

Adjust the amount of memory (in kilobytes) sort uses. If kmem is not specified, allocate the maximum memory.

-z recsz

Provide the maximum number of bytes for any one line in the file. This option prevents abnormal termination of sort in certain cases.

+ n [- m ]

Skip n fields before sorting, and sort up to field position m . If m is missing, sort to end of line. Positions take the form a . b , which means character b of field a . If . b is missing, sort at the first character of the field.

Examples

List files by decreasing number of lines:



wc -l * | sort -r

Alphabetize a list of words, remove duplicates, and print the frequency of each word:



sort -fd wordlist | uniq -c

Sort the password file numerically by the third field (user ID):



sort +2n -t: /etc/passwd


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