wc
Created by : Mr Dk.
2022 / 11 / 25 0:19
Hangzhou, Zhejiang, China
Background
wc 用于打印每个文件的行数、单词数和字节数。
Usage
$ 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. A word is a non-zero-length sequence of
characters delimited by white space.
With no FILE, or when FILE is -, read standard input.
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 maximum display width
-w, --words print the word counts
--help display this help and exit
--version output version information and exit
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Full documentation at: <https://www.gnu.org/software/coreutils/wc>
or available locally via: info '(coreutils) wc invocation'
如示例所示，文件中有两行、6 个单词、23 个字节：
$ cat example.txt
aaa bb cccc
dd e fffff
$ wc example.txt
2 6 23 example.txt
通过 -l / -w / -c 参数可以分别打印上述的行数、单词数、字节数：
$ wc -l example.txt
2 example.txt
$ wc -w example.txt
6 example.txt
$ wc -c example.txt
23 example.txt
-m 选项用于打印 字符数。
-l 选项可以打印长度最长的行的长度：
$ wc -L example.txt
11 example.txt