在写命令的时候经常见到别人写 "-" 请问那个"-" 是什么意思呢?

[excalibur]

如题 谢谢

[O_O_BOT]

STDIN or STDOUT

[tusooa]

如

代码： 全选

tar -cf -  ~/backup | tar -xf - -C ~/.bak/20090910/
      Stdin                Stdout

[t3swing]

ls能给点资料链接不 ？ - 这个东西不好搜索啊

[tusooa]

>> lzma --help
Usage: lzma [OPTION]... [FILE]...
Compress or decompress FILEs in the .xz format.

Mandatory arguments to long options are mandatory for short options too.

-z, --compress force compression
-d, --decompress force decompression
-t, --test test compressed file integrity
-l, --list list information about files
-k, --keep keep (don't delete) input files
-f, --force force overwrite of output file and (de)compress links
-c, --stdout write to standard output and don't delete input files
-0 .. -9 compression preset; 0-2 fast compression, 3-5 good
compression, 6-9 excellent compression; default is 6
-e, --extreme use more CPU time when encoding to increase compression
ratio without increasing memory usage of the decoder
-q, --quiet suppress warnings; specify twice to suppress errors too
-v, --verbose be verbose; specify twice for even more verbose
-h, --help display this short help
-H, --long-help display the long help (lists also the advanced options)
-V, --version display the version number

With no FILE, or when FILE is -, read standard input.

Report bugs to <[email protected]> (in English or Finnish).
XZ Utils home page: <http://tukaani.org/xz/>