【原文鏈接】Linux----tee命令詳細(xì)使用方法

一、tee命令使用方法

1.1 tee命令的功能

tee命令主要作用就是將標(biāo)準(zhǔn)出中的內(nèi)容在控制臺顯示的同時并寫入文件，如果直接使用重定向符，則只會寫入文件，而不會在控制臺顯示，tee就是為了解決這個問題的。

1.2 tee命令的選項參數(shù)

• -a: 通過追加的方式將內(nèi)容寫入文件

二、tee命令使用實例

2.1 將標(biāo)準(zhǔn)輸出的內(nèi)容同時向控制臺和文件中寫入，同時寫文件時將文件內(nèi)容清空后寫入

如下，通過echo打印hello world字符串，同時將hello world字符串寫入demo.txt文件，執(zhí)行兩遍后，demo.txt中仍然是hello world字符串，因此此時tee是將文件清空后再寫入。

[root@jiayi-centos-01 opt]# echo "hello world" | tee demo.txt
hello world
[root@jiayi-centos-01 opt]# cat demo.txt
hello world
[root@jiayi-centos-01 opt]# echo "hello world" | tee demo.txt
hello world
[root@jiayi-centos-01 opt]# cat demo.txt
hello world
[root@jiayi-centos-01 opt]#

2.2 將標(biāo)準(zhǔn)輸出的內(nèi)容同時向控制臺和文件中寫入，同時寫文件時在文件后追加

如下，通過-a參數(shù)即可做到。

[root@jiayi-centos-01 opt]# echo "hello world" | tee -a demo.txt
hello world
[root@jiayi-centos-01 opt]# cat demo.txt
hello world
[root@jiayi-centos-01 opt]# echo "hello world" | tee -a demo.txt
hello world
[root@jiayi-centos-01 opt]# cat demo.txt
hello world
hello world
[root@jiayi-centos-01 opt]#

2.3 典型應(yīng)用：將配置文件內(nèi)容導(dǎo)出到另外一個文件，并且去掉注釋

如下，查看 /etc/ssh/ssh_config 配置文件如下

[root@jiayi-centos-01 opt]# cat /etc/ssh/ssh_config
#       $OpenBSD: ssh_config,v 1.30 2016/02/20 23:06:23 sobrado Exp $

# This is the ssh client system-wide configuration file.  See
# ssh_config(5) for more information.  This file provides defaults for
# users, and the values can be changed in per-user configuration files
# or on the command line.

# Configuration data is parsed as follows:
#  1. command line options
#  2. user-specific file
#  3. system-wide file
# Any configuration value is only changed the first time it is set.
# Thus, host-specific definitions should be at the beginning of the
# configuration file, and defaults at the end.

# Site-wide defaults for some commonly used options.  For a comprehensive
# list of available options, their meanings and defaults, please see the
# ssh_config(5) man page.

# Host *
#   ForwardAgent no
#   ForwardX11 no
#   RhostsRSAAuthentication no
#   RSAAuthentication yes
#   PasswordAuthentication yes
#   HostbasedAuthentication no
#   GSSAPIAuthentication no
#   GSSAPIDelegateCredentials no
#   GSSAPIKeyExchange no
#   GSSAPITrustDNS no
#   BatchMode no
#   CheckHostIP yes
#   AddressFamily any
#   ConnectTimeout 0
#   StrictHostKeyChecking ask
#   IdentityFile ~/.ssh/identity
#   IdentityFile ~/.ssh/id_rsa
#   IdentityFile ~/.ssh/id_dsa
#   IdentityFile ~/.ssh/id_ecdsa
#   IdentityFile ~/.ssh/id_ed25519
#   Port 22
#   Protocol 2
#   Cipher 3des
#   Ciphers aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
#   MACs hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160
#   EscapeChar ~
#   Tunnel no
#   TunnelDevice any:any
#   PermitLocalCommand no
#   VisualHostKey no
#   ProxyCommand ssh -q -W %h:%p gateway.example.com
#   RekeyLimit 1G 1h
#
# Uncomment this if you want to use .local domain
# Host *.local
#   CheckHostIP no

Host *
        GSSAPIAuthentication yes
# If this option is set to yes then remote X11 clients will have full access
# to the original X11 display. As virtually no X11 client supports the untrusted
# mode correctly we set this to yes.
        ForwardX11Trusted yes
# Send locale-related environment variables
        SendEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES
        SendEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
        SendEnv LC_IDENTIFICATION LC_ALL LANGUAGE
        SendEnv XMODIFIERS
[root@jiayi-centos-01 opt]#

這里面有許多的注釋，現(xiàn)在想將里面有效的配置內(nèi)容導(dǎo)出為文件，同時在控制臺顯示文章來源地址http://www.zghlxwxcb.cn/news/detail-480102.html

[root@jiayi-centos-01 opt]# grep -v '^#' /etc/ssh/ssh_config | tee demo.txt





Host *
        GSSAPIAuthentication yes
        ForwardX11Trusted yes
        SendEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES
        SendEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
        SendEnv LC_IDENTIFICATION LC_ALL LANGUAGE
        SendEnv XMODIFIERS
[root@jiayi-centos-01 opt]# cat demo.txt





Host *
        GSSAPIAuthentication yes
        ForwardX11Trusted yes
        SendEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES
        SendEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
        SendEnv LC_IDENTIFICATION LC_ALL LANGUAGE
        SendEnv XMODIFIERS
[root@jiayi-centos-01 opt]#

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