linux命令之fold

1.fold介绍

linux命令fold用于将文本文件中的行进行折叠处理，使其适应特定的显示宽度。

2.fold用法

fold [参数] filename

参数	说明
-b	指定折行的字节数，而不是列数
-s	指定折叠后的每行宽度。默认宽度为80个字符

3.fold样例

3.1.fold版本查看

命令：

fold --version

[root@patrolagent ~]# fold --version
fold (GNU coreutils) 8.22
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 David MacKenzie.
[root@patrolagent ~]# 

3.2.fold帮助

命令：

fold --help

[root@patrolagent ~]# fold --help
Usage: fold [OPTION]... [FILE]...
Wrap input lines in each FILE (standard input by default), writing to
standard output.Mandatory arguments to long options are mandatory for short options too.-b, --bytes         count bytes rather than columns-c, --characters    count characters rather than columns-s, --spaces        break at spaces-w, --width=WIDTH   use WIDTH columns instead of 80--help     display this help and exit--version  output version information and exitGNU coreutils online help: <http://www.gnu.org/software/coreutils/>
For complete documentation, run: info coreutils 'fold invocation'
[root@patrolagent ~]# 

3.3.指定折叠后的每行宽度

命令：

fold -w 3 1.txt

[root@patrolagent ~]# fold -w 3 1.txt 
aaabbb
dddcc
c
[root@patrolagent ~]# 

3.4.制定折叠后的每行字节

命令：

fold -b3 1.txt

[root@patrolagent ~]# cat 1.txt 
aaa   bbb
ddd ccc
[root@patrolagent ~]# fold -b3 1.txt 
aaabbbdd
d c
cc
[root@patrolagent ~]#