Linux tee命令

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　　tee 从标准输入读取，并写入标准输出和文件
　　

　　tee 命令参数
　　-a, --append                     追加附加到给定的文件，不要重写
　　-i, --ignore-interrupts      忽略中断，忽略中断信号
　　--help                            帮助显示此帮助并退出
　　--version                        版本输出版本信息和退出
[root@localhost ~]# ll | tee -a ll.txt
total 20
-rw-------. 1 root root 1211 Feb 27  2017 anaconda-ks.cfg
-rw-r--r--. 1 root root 9458 Feb 27  2017 install.log
-rw-r--r--. 1 root root 3161 Feb 27  2017 install.log.syslog
-rw-r--r--  1 root root    0 Nov  7 17:58 ll.txt
[root@localhost ~]# cat ll.txt
total 20
-rw-------. 1 root root 1211 Feb 27  2017 anaconda-ks.cfg
-rw-r--r--. 1 root root 9458 Feb 27  2017 install.log
-rw-r--r--. 1 root root 3161 Feb 27  2017 install.log.syslog
-rw-r--r--  1 root root    0 Nov  7 17:58 ll.txt
[root@localhost ~]# pwd | tee pwd.txt
/root
[root@localhost ~]# cat pwd.txt
/root　　查看tee命令版本
[root@svn ~]# tee  --version
tee (GNU coreutils) 8.4
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://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.
Written by Mike Parker, Richard M. Stallman, and David MacKenzie.　　查看命令帮助

[root@svn ~]# tee --help
Usage: tee [OPTION]... [FILE]...
Copy standard input to each FILE, and also to standard output.
  -a, --append              append to the given FILEs, do not overwrite
  -i, --ignore-interrupts   ignore interrupt signals
      --help     display this help and exit
      --version  output version information and exit
If a FILE is -, copy again to standard output.
Report tee 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/>
For complete documentation, run: info coreutils 'tee invocation'[root@svn ~]# man tee
TEE(1)                           User Commands                          TEE(1)
NAME
       tee - read from standard input and write to standard output and files
SYNOPSIS
       tee [OPTION]... [FILE]...
DESCRIPTION
       Copy standard input to each FILE, and also to standard output.
       -a, --append
              append to the given FILEs, do not overwrite
       -i, --ignore-interrupts
              ignore interrupt signals
       --help display this help and exit
       --version
              output version information and exit
       If a FILE is -, copy again to standard output.
AUTHOR
       Written by Mike Parker, Richard M. Stallman, and David MacKenzie.
REPORTING BUGS
       Report tee 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/>
       Report tee translation bugs to <http://translationproject.org/team/>
COPYRIGHT
       Copyright  2010 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://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
       The  full  documentation  for tee is maintained as a Texinfo manual.  If the info and tee programs are properly installed at your site,
       the command
              info coreutils 'tee invocation'