tee命令学习

[root@localhost ~]# cat man.tee.txt
TEE(1) User Commands TEE(1)

NAME
tee - read from standard input and write to standard output and files

#从标准输入读取，并写入标准输出和文件

 

SYNOPSIS
tee [OPTION]... [FILE]...

DESCRIPTION
Copy standard input to each FILE, and also to standard output.

 可以操作多个文件

#####################

限制CPU最大频率到50%
echo "50" | sudo tee /sys/devices/system/cpu/intel_pstate/max_perf_pct

[root@localhost ipv4]# cat /proc/sys/net/ipv4/icmp_echo_ignore_all
0
[root@localhost ipv4]# echo "1" | tee /proc/sys/net/ipv4/icmp_echo_ignore_all
1
[root@localhost ipv4]# cat /proc/sys/net/ipv4/icmp_echo_ignore_all
1

tee 命令从 echo 命令获取输入，并将输出打印到终端以及文件

####################

 

 

-a, --append
append to the given FILEs, do not overwrite

#附加到给定的文件，不要覆盖

echo '192.168.1.0/24 via  192.168.1.254' | sudo tee -a /etc/sysconfig/network-scripts/route-ens1

 

 

-i, --ignore-interrupts
ignore interrupt signals

#忽略中断信号（如ctrl+c）

[root@localhost ~]# ping 8.8.8.8 | tee -i ping.txt
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=128 time=45.5 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=128 time=25.1 ms
^C
--- 8.8.8.8 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 4ms
rtt min/avg/max/mdev = 25.121/35.288/45.455/10.167 ms
[root@localhost ~]# cat ping.txt
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=128 time=45.5 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=128 time=25.1 ms

--- 8.8.8.8 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 4ms
rtt min/avg/max/mdev = 25.121/35.288/45.455/10.167 ms

 

 

-p diagnose errors writing to non pipes

#诊断写入非管道的错误

 

--help display this help and exit

 

--version
output version information and exit

 

--output-error[=MODE]
set behavior on write error. See MODE below

 

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.

 

AUTHOR
Written by Mike Parker, Richard M. Stallman, and David MacKenzie.

REPORTING BUGS
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report tee translation bugs to <https://translationproject.org/team/>

COPYRIGHT
Copyright © 2018 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://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
Full documentation at: <https://www.gnu.org/software/coreutils/tee>
or available locally via: info '(coreutils) tee invocation'

GNU coreutils 8.30