tee命令用于将标准输入复制到每个指定文件，并显示到标准输出。tee指令会从标准输入设备读取数据，将其内容输出到标准输出设备，同时保存成文件。
- 基本参数
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
-p diagnose errors writing to non pipes
--output-error[=MODE] set behavior on write error. See MODE below
--help display this help and exit
--version output version information and exit
MODE determines behavior with write errors on the outputs:
'warn' diagnose errors writing to any output
'warn-nopipe' diagnose errors writing to any output not a pipe
'exit' exit on error writing to any output
'exit-nopipe' exit on error writing to any output not a pipe
The default MODE for the -p option is 'warn-nopipe'.
The default operation when --output-error is not specified, is to
exit immediately on error writing to a pipe, and diagnose errors
writing to non pipe outputs.
- 将屏幕输出同时输出到文件：
ping www.baidu.com | tee pingbaidu.log
PING www.wshifen.com (103.235.46.40) 56(84) bytes of data.
64 bytes from 103.235.46.40 (103.235.46.40): icmp_seq=1 ttl=55 time=3.79 ms
64 bytes from 103.235.46.40 (103.235.46.40): icmp_seq=2 ttl=55 time=3.87 ms
......
cat pingbaidu.com
PING www.wshifen.com (103.235.46.40) 56(84) bytes of data.
64 bytes from 103.235.46.40 (103.235.46.40): icmp_seq=1 ttl=55 time=3.79 ms
64 bytes from 103.235.46.40 (103.235.46.40): icmp_seq=2 ttl=55 time=3.87 ms
......- 追加到输出文件
ping www.sina.com | tee -a pingbaidu.log
PING ww1.sinaimg.cn.w.alikunlun.com (47.246.16.231) 56(84) bytes of data.
64 bytes from 47.246.16.231 (47.246.16.231): icmp_seq=1 ttl=57 time=2.15 ms
64 bytes from 47.246.16.231 (47.246.16.231): icmp_seq=2 ttl=57 time=5.42 ms
......
cat pingbaidu.log
PING www.wshifen.com (103.235.46.40) 56(84) bytes of data.
64 bytes from 103.235.46.40 (103.235.46.40): icmp_seq=1 ttl=55 time=3.79 ms
64 bytes from 103.235.46.40 (103.235.46.40): icmp_seq=2 ttl=55 time=3.87 ms
64 bytes from 103.235.46.40 (103.235.46.40): icmp_seq=3 ttl=55 time=4.62 ms
64 bytes from 103.235.46.40 (103.235.46.40): icmp_seq=4 ttl=55 time=3.77 ms
PING ww1.sinaimg.cn.w.alikunlun.com (47.246.16.231) 56(84) bytes of data.
64 bytes from 47.246.16.231 (47.246.16.231): icmp_seq=1 ttl=57 time=2.15 ms
64 bytes from 47.246.16.231 (47.246.16.231): icmp_seq=2 ttl=57 time=5.42 ms
64 bytes from 47.246.16.231 (47.246.16.231): icmp_seq=3 ttl=57 time=2.16 ms
......- 将内容输出到多个文件，我们直接在tee命令后面直接添加对应的文件
ping www.baidu.com | tee pingbaidu.log ping.log
PING www.wshifen.com (183.232.231.172) 56(84) bytes of data.
64 bytes from 183.232.231.172: icmp_seq=1 ttl=46 time=21.2 ms
64 bytes from 183.232.231.172: icmp_seq=2 ttl=46 time=19.4 ms
64 bytes from 183.232.231.172: icmp_seq=3 ttl=46 time=19.4 ms
64 bytes from 183.232.231.172: icmp_seq=4 ttl=46 time=20.5 ms
......
cat pingbaidu.log
PING www.wshifen.com (183.232.231.172) 56(84) bytes of data.
64 bytes from 183.232.231.172: icmp_seq=1 ttl=46 time=21.2 ms
64 bytes from 183.232.231.172: icmp_seq=2 ttl=46 time=19.4 ms
64 bytes from 183.232.231.172: icmp_seq=3 ttl=46 time=19.4 ms
64 bytes from 183.232.231.172: icmp_seq=4 ttl=46 time=20.5 ms
......
cat ping.log
ING www.wshifen.com (183.232.231.172) 56(84) bytes of data.
64 bytes from 183.232.231.172: icmp_seq=1 ttl=46 time=21.2 ms
64 bytes from 183.232.231.172: icmp_seq=2 ttl=46 time=19.4 ms
64 bytes from 183.232.231.172: icmp_seq=3 ttl=46 time=19.4 ms
64 bytes from 183.232.231.172: icmp_seq=4 ttl=46 time=20.5 ms
- 忽略中断事件，这个时候我们可以使用-i参数
$ ping www.baidu.com | tee -i pingbaidu.log ping.log
PING www.wshifen.com (183.232.231.172) 56(84) bytes of data.
64 bytes from 183.232.231.172: icmp_seq=1 ttl=46 time=20.4 ms
64 bytes from 183.232.231.172: icmp_seq=2 ttl=46 time=19.6 ms
64 bytes from 183.232.231.172: icmp_seq=3 ttl=46 time=19.9 ms
64 bytes from 183.232.231.172: icmp_seq=4 ttl=46 time=19.3 ms
^C
--- www.wshifen.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 19.311/19.842/20.465/0.450 ms
......
cat pingbaidu.log
PING www.wshifen.com (183.232.231.172) 56(84) bytes of data.
64 bytes from 183.232.231.172: icmp_seq=1 ttl=46 time=20.4 ms
64 bytes from 183.232.231.172: icmp_seq=2 ttl=46 time=19.6 ms
64 bytes from 183.232.231.172: icmp_seq=3 ttl=46 time=19.9 ms
64 bytes from 183.232.231.172: icmp_seq=4 ttl=46 time=19.3 ms
--- www.wshifen.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 19.311/19.842/20.465/0.450 ms