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di1984HIT： xuexile!!!
Linux下的UDP/TCP端口映射（netcat and socat）

expand and upexpand

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expand:
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 expand bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>

unexpand:
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 (enables -a)

       --help display this help and exit

       --version
              output version information and exit

AUTHOR
       Written by David MacKenzie.

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2011-04-09 13:33
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