An example of using tee Command in Linux system
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Name: tee
Location: / usr/bin/tee
Permissions: all users
Function: two-way redirection, which sends the data stream to both the file and the screen, while the output to the screen is stdout, which allows the next command to continue processing.
Usage: tee [OPTION]. [FILE]...
Options:
-a,-append append to the given FILEs, do not overwrite
Additional
Two-way redirection, after the file last.list is written, it can also be output to the screen.
The code is as follows:
Last | tee last.list
Cwjy1202 pts/0: 0 Sat Jan 10 22:14 still logged in
Reboot system boot 3.2.0-24-generic Sat Jan 10 21:45-23:02 (01:16)
Cwjy1202 pts/0: 0.0 Sat Jan 10 19:24-down (00:00)
Reboot system boot 3.2.0-24-generic Sat Jan 10 14:17-19:24 (05:07)
Reboot system boot 3.2.0-24-generic Fri Jan 9 20:50-22:50 (01:59)
Cwjy1202 pts/0: 0 Thu Jan 8 22:08-23:16 (01:08)
Reboot system boot 3.2.0-24-generic Thu Jan 8 21:45-23:17 (01:31)
Cwjy1202 pts/2: 0 Wed Jan 7 23:22-00:27 (01:05)
Cwjy1202 pts/0: 0 Wed Jan 7 23:04-00:27 (01:23)
Reboot system boot 3.2.0-24-generic Wed Jan 7 23:03-00:27 (01:23)
Cwjy1202 pts/2: 0 Tue Jan 6 23:10-23:46 (00:36)
Cwjy1202 pts/0: 0 Tue Jan 6 22:32-23:46 (01:13)
Reboot system boot 3.2.0-24-generic Tue Jan 6 19:32-23:46 (04:13)
Cwjy1202 pts/0: 0 Tue Jan 6 00:24-00:46 (00:21)
Reboot system boot 3.2.0-24-generic Mon Jan 5 20:59-00:46 (03:47)
Cwjy1202 pts/0: 0 Sat Jan 3 20:33-00:39 (04:06)
Cwjy1202 pts/0: 0 Sat Jan 3 19:23-19:24 (00:00)
Reboot system boot 3.2.0-24-generic Sat Jan 3 19:12-00:41 (05:28)
Cwjy1202 pts/2: 0 Sat Jan 3 14:58-17:04 (02:05)
Cwjy1202 pts/1: 0 Sat Jan 3 14:57-17:04 (02:07)
Reboot system boot 3.2.0-24-generic Sat Jan 3 14:54-17:05 (02:10)
Wtmp begins Fri Jan 2 17:17:32 2015
Note: the named tee command does not add the option-a, so the default file will be overwritten.
In the following example, the information of last is written to the file last.list and can also be processed by the sed command
The code is as follows:
$last | tee-a last.list | sed-n '1p'
Cwjy1202 pts/0: 0 Sat Jan 10 22:14 still logged in
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