unexpand [OPTION]... [FILE]...
!subtitle:功能
将空格转换为制表符（\t）。
!subtitle:类型
可执行文件（/usr/bin/unexpand），属于 coreutils。
!subtitle:参数
OPTION 选项：
-a, --all - 转换搜索空格，而不仅是前导空格
--first-only - 仅转换前导空格
-t, --tabs=N - 制表位宽度为 N 个字符；默认为 8
-t, --tabs=LIST- 使用 LIST 指定制表位的位置
--help - 显示帮助
--version - 显示版本
FILE - 文件列表；如果没有这个参数或指定为 -，则读取标准输入
$ echo -e " A B C" > 1.txt
$ unexpand 1.txt | cat -t
^IA B C
$ unexpand -a 1.txt | cat -t
^IA^I B^I C
| 命令 | 说明 |
|---|---|
| expand | 将制表符（\t）转换为空格 |
UNEXPAND(1) User Commands UNEXPAND(1)
NAME
unexpand - convert spaces to tabs
SYNOPSIS
unexpand [OPTION]... [FILE]...
DESCRIPTION
Convert blanks in each FILE to tabs, writing to standard output.
With no FILE, or when FILE is -, read standard input.
Mandatory arguments to long options are mandatory for short options
too.
-a, --all
convert all blanks, instead of just initial blanks
--first-only
convert only leading sequences of blanks (overrides -a)
-t, --tabs=N
have tabs N characters apart instead of 8 (enables -a)
-t, --tabs=LIST
use comma separated list of tab positions. The last specified
position can be prefixed with '/' to specify a tab size to use
after the last explicitly specified tab stop. Also a prefix of
'+' can be used to align remaining tab stops relative to the
last specified tab stop instead of the first column
--help display this help and exit
--version
output version information and exit
AUTHOR
Written by David MacKenzie.
REPORTING BUGS
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report any translation bugs to <https://translationproject.org/team/>
COPYRIGHT
Copyright © 2023 Free Software Foundation, Inc. License GPLv3+: GNU
GPL version 3 or later <https://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.
SEE ALSO
expand(1)
Full documentation <https://www.gnu.org/software/coreutils/unexpand>
or available locally via: info '(coreutils) unexpand invocation'
GNU coreutils 9.4 April 2024 UNEXPAND(1)