Linux 指令篇:文本排序--sort
NAME
sort - sort lines of text files
SYNOPSIS
sort [OPTION]... [FILE]...
sort [OPTION]... --files0-from=F
DESCRIPTION
Write sorted concatenation of all FILE(s) to standard output.
Mandatory arguments to long options are mandatory for short options too. Ordering options:
-f, --ignore-case
fold lower case to upper case characters
-n, --numeric-sort
compare according to string numerical value
-r, --reverse
reverse the result of comparisons
-k, --key=POS1[,POS2]
start a key at POS1 (origin 1), end it at POS2 (default end of line)
-t, --field-separator=SEP
use SEP instead of non-blank to blank transition
-u, --unique
with -c, check for strict ordering; without -c, output only the first of an equal run
===============================================================
e.g.1
[root@localhost tmp]# sort num.txt
11
132
132
43
457
667
999
[root@localhost tmp]# sort -n num.txt
11
43
132
132
457
667
999
[root@localhost tmp]# sort -n -u num.txt
11
43
132
457
667
999
[root@localhost tmp]# sort -n -u -r num.txt
999
667
457
132
43
11
==============================================================
e.g.2
[root@localhost tmp]# sort passwd
bin:x:62:1:bin:/bin:/sbin/nologin
daemon:x:222:2:daemon:/sbin:/sbin/nologin
root:x:36:0:root:/root:/bin/bash
[root@localhost tmp]# sort -t: -k3 passwd
daemon:x:222:2:daemon:/sbin:/sbin/nologin
root:x:36:0:root:/root:/bin/bash
bin:x:62:1:bin:/bin:/sbin/nologin
[root@localhost tmp]# sort -n -t: -k3 passwd
root:x:36:0:root:/root:/bin/bash
bin:x:62:1:bin:/bin:/sbin/nologin
daemon:x:222:2:daemon:/sbin:/sbin/nologin