Linux wc指令解析

wc指令比较实用，可以统计文件中的字节数、字符数、行数、字数等。

先通过 wc --help 查看指令帮助。

$ wc --help
Usage: wc [OPTION]... [FILE]...
  or:  wc [OPTION]... --files0-from=F
Print newline, word, and byte counts for each FILE, and a total line if
more than one FILE is specified.  With no FILE, or when FILE is -,
read standard input.  A word is a non-zero-length sequence of characters
delimited by white space.
The options below may be used to select which counts are printed, always in
the following order: newline, word, character, byte, maximum line length.
  -c, --bytes            print the byte counts
  -m, --chars            print the character counts
  -l, --lines            print the newline counts
      --files0-from=F    read input from the files specified by
                           NUL-terminated names in file F;
                           If F is - then read names from standard input
  -L, --max-line-length  print the length of the longest line
  -w, --words            print the word counts
      --help     display this help and exit
      --version  output version information and exit

Report wc bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
For complete documentation, run: info coreutils 'wc invocation'

格式：wc [option] ... [file]

$ cat 123.txt 
12345
mn
67890234
xyz

-c 或者 -bytes：打印文件字节数

$ wc -c 123.txt 
22 123.txt

-m 或者 --chars：打印文件字符数

$ wc -m 123.txt  
22 123.txt

-l 或者 --lines：打印文件行数

$ wc -l 123.txt  
4 123.txt

-L 或者 --max-line-length：打印最长一行的长度

$ wc -L 123.txt  
8 123.txt

-w 或者 --words：打印字数

$ wc -w 123.txt  
4 123.txt

--help：查看指令帮助并退出

--version：输出版本信息并退出

$ wc --version
wc (GNU coreutils) 8.21
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Paul Rubin and David MacKenzie.