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grep means comprehensive search for regular expressions. It is a powerful text search tool for filtering and searching for specific characters, and it is also the most widely used command. Syntax format: grep [parameter] Common parameters: Example # 在文件中搜索字符串grep “putText” motion_detector.py # 在多个文件中搜索grep “putText” test1.py test2.py test3.py # 输出除了字符串外的其它内容grep -v “putText” test.py # 统计字符串出现的行数总数grep -c

The route command is used to display and set the network routing information in linux , where the route refers to the static route. It should be noted that the route command is not permanently saved. Syntax format: route [parameter] Common parameters: Example # 显示当前路由route # 添加一条路由，多网卡可以通过dev来指定route add -net 192.168.1.1 netmask 255.255.255.0 dev eth0 #

ifconfig command is used to view and configure network parameters. The information configured using the ifconfig command does not exist after the network card is restarted or the machine is restarted. If you want to save it forever, you need to modify the configuration file of the network card. Syntax format: ifconfig [parameter] Common parameters:

The whoami command is to print out the user name logged in the current system. Syntax format: whoami [parameter] Common parameters: Example # 查询登录的用户名whoami This article is reprinted from https://xugaoxiang.com/2022/06/07/linux-cmds-27-whoami/ This site is for inclusion only, and the copyright belongs to the original author.

The hostname command is used to display and set the hostname of the system. The environment variable HOSTNAME also holds the current hostname. However, after using the hostname command to set the host name, the original host name is still used after the system restarts. If you need to make permanent changes, you need to