Today, the second chapter of command over learning, learning to command as follows:
2.4 system state detection command
1. ifconfig: NIC configuration for acquiring the network status information, the format of "the ifconfig [Network Device] [parameter]";
2. uname: for viewing system kernel and version information in the format of "uname [-a]";
3. uptime: View the system load information in the format of uptime;
4. free: display current system memory usage information, the format of "free [-h]";
5. who: Check sign information of the current user terminal host, the format of "WHO [parameter]";
6. last: Log in to view a record of all systems in the format "last [parameters]";
7. history: Display the command history executed in the format of "history [-c]";
8. sosreport: Gather system configuration and schema information and diagnostic output document format sosreport.
2.5 working directory command
1. pwd: display the user's current working directory is located, the format of "pwd [Option]";
2. cd: switching the working path, the format of "CD [directory name]";
cd .. go back one level
enter the user's home directory cd ~
cd - where the return on a directory
3. ls: Displays the file directory information in the format of "ls [options] [file]."
2.6 text file editor command
1. cat: view plain text files (less contents), the format of "cat [option] [file]";
2. more: view plain text files (more content), the format is "more [options] [file]";
3. head: see the plain text of the document before the N line, the format is "head [options] [file]";
Example: head 20 filename -n (20 lines before viewing the file)
4. tail: View the N-line plain text documents or continue to refresh the content in the format of "tail [options] [file]";
Example: tail -n 20 filename (20th row view files)
Example: tail -f / var / log / message (real-time view log information)
5. tr: replace characters in the text file, the format of "TR [original character] [target character]";
6. wc: the number of lines of specified text, words, bytes, the format of "TR [parameter] Text";
7. stat: specific store information and time to review documents and other information, in the format of "stat file name";
8. cut: extracting columns of text characters, the format of "Cut [parameter] Text";
9. diff: diff plurality of text files, the format of "diff [parameter] file."
2.7 directory management commands
1. touch: Create a blank file or set of files the time, the format is "touch [options] [file]";
2. mkdir: Create a blank directory, in the format "mkdir [options] directory";
3. cp: copy a file or directory, in the format "cp [options] source destination file";
4. mv: Cut file or rename the file, the format is "mv [options] source [destination path | destination file name]";
5. rm: delete a file or directory, in the format "rm [options] files";
6. dd: to copy the specified data blocks according to the size or number or convert file format "dd [parameter]";
7. file: file type view of the format of "file filename";
2.8 compression and packing the search command
1. tar: play the file compression or decompression, the format of "tar [options] [file]";
2. grep: perform a keyword search in the text, and display the results match the format of "grep [options] [file]";
3. find: in accordance with the specified criteria to find the file, the format is "find [Search Path] Looking operating conditions."
Here are some study notes:
