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=NUMBER
have tabs NUMBER characters apart, not 8
-t, –tabs=LIST
use comma separated list of explicit tab positions
–help display this help and exit
–version
output version information and exit
AUTHOR
Written by David MacKenzie.
REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>.
COPYRIGHT
Copyright © 2006 Free Software Foundation, Inc.
This is free software. You may redistribute copies of it under the terms of the GNU General Public
License <http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
unexpand(1)
The full documentation for expand is maintained as a Texinfo manual. If the info and expand programs a Texinfo manual.
If the info and expand programs are properly installed at your site,
the command
info expand
should give you access to the complete manual.
补允、更新（2009-03-12）：
在vi中，可以通过设置vi的变量来达到使用若干空格代替“tab”健的目的。在运行中，可以通过指令 :set expandtab ( :set et )设置vi，使vi用若干空格来代替“tab”，空格的个数，可以通过：set ts=4来设置“tab”健占四个字符位。当然也可以将指令存入配置文件，避免每次都需要设置。