expand [OPTION]... [FILE]...
!subtitle:功能
将制表符（\t）转换为空格。
!subtitle:类型
可执行文件（/usr/bin/expand），属于 coreutils。
!subtitle:参数
OPTION 选项：
-i, --initial - 非空格后的制表符不要转换
-t, --tabs=N - 制表位的宽度设为 N；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\tB\tC" > 1.txt # 创建一个文件
$ cat 1.txt # 查看文件
A B C
$ expand 1.txt # 默认制表位宽度为 8
A B C
$ expand -t 4 1.txt # 指定制表位宽度为 4
A B C
$ expand -t 4,16 1.txt # 指定制表位的位置为 4,16
A B C
EXPAND(1) User Commands EXPAND(1)
NAME
expand - convert tabs to spaces
SYNOPSIS
expand [OPTION]... [FILE]...
DESCRIPTION
Convert tabs in each FILE to spaces, 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.
-i, --initial
do not convert tabs after non blanks
-t, --tabs=N
have tabs N characters apart, not 8
-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
unexpand(1)
Full documentation <https://www.gnu.org/software/coreutils/expand>
or available locally via: info '(coreutils) expand invocation'
GNU coreutils 9.4 April 2024 EXPAND(1)