摘要： sudo Instead of using the root user account, unprivileged users can be configured for using administrator permissions on specific tasks by using sudo. 阅读全文

摘要： Using su The su command allows users to open a terminal window, and from that terminal start a sub shell in which the user has another identity. To perform administrative tasks, for insta... 阅读全文

摘要： ls Common Command-Line Options Command Use： ls -l Shows a long listing, which includes information about file properties, such as creation date and permissions. ls -a Shows all fil... 阅读全文

摘要： Counting Lines, Words, and Characters with wc When working with text files, you sometimes get a large amount of output. Before deciding which approach 阅读全文

摘要： Sorting File Contents and Output with sort Another very useful command to use on text file is sort . As you can probably guess, this command sorts tex 阅读全文

摘要： Filtering Specific Columns with cut When working with text files, it can be useful to filter out specific fields. Imagine that you need to see a list 阅读全文

摘要： [root@rhel7 ~]# cat rusky --cat命令查看文件内容 line1 line2 line3 line4 line5 line6 line7 line8 line9 line10 [root@rhel7 ~]# tail -n 3 rusky --查看最后3行内容 line8 line9 line10 [root@rhel7 ~]# tail -3 rusky ... 阅读全文

摘要： [rusky@rhel7 test]$ lstest1 test123 test2 test317 test33 test335 test336 test44 testtest[rusky@rhel7 test]$ ls test?3test33[rusky@rhel7 test]$ ls test??3test123[rusky@rhel7 test]$ ls test... 阅读全文

摘要： ■ The mount command gives an overview of all mounted devices. To get this information, the /proc/mounts file is read, where the kernel keeps informati 阅读全文

摘要： /etc/motd and /etc/issue Bash offers an option to include messages in the /etc/motd and the /etc/issue files. Messages in /etc/motd display after a us 阅读全文