Linux Directory Commands
1. pwd Command
The pwd command is used to display the location of the current working directory.
Syntax:
- pwd
Output:
2. mkdir Command
The mkdir command is used to create a new directory under any directory.
Syntax:
- mkdir <directory name>
Output:
3. rmdir Command
The rmdir command is used to delete a directory.
Syntax:
- rmdir <directory name>
Output:
AD
4. ls Command
The ls command is used to display a list of content of a directory.
Syntax:
- ls
Output:
5. cd Command
AD
The cd command is used to change the current directory.
Syntax:
- cd <directory name>
Output:
Linux File commands
6. touch Command
The touch command is used to create empty files. We can create multiple empty files by executing it once.
Syntax:
- touch <file name>
- touch <file1> <file2> ….
Output:
7. cat Command
The cat command is a multi-purpose utility in the Linux system. It can be used to create a file, display content of the file, copy the content of one file to another file, and more.
Syntax:
- cat [OPTION]… [FILE]..
To create a file, execute it as follows:
- cat > <file name>
- // Enter file content
Press “CTRL+ D” keys to save the file. To display the content of the file, execute it as follows:
- cat <file name>
Output:
8. rm Command
The rm command is used to remove a file.
Syntax:
rm <file name>
Output:
9. cp Command
The cp command is used to copy a file or directory.
Syntax:
To copy in the same directory:
- cp <existing file name> <new file name>
To copy in a different directory:
Output:
10. mv Command
The mv command is used to move a file or a directory form one location to another location.
Syntax:
- mv <file name> <directory path>
Output:
11. rename Command
The rename command is used to rename files. It is useful for renaming a large group of files.
Syntax:
- rename ‘s/old-name/new-name/’ files
For example, to convert all the text files into pdf files, execute the below command:
- rename ‘s/\.txt$/\.pdf/’ *.txt
Output:
Linux File Content Commands
12. head Command
The head command is used to display the content of a file. It displays the first 10 lines of a file.
Syntax:
- head <file name>
Output:
13. tail Command
The tail command is similar to the head command. The difference between both commands is that it displays the last ten lines of the file content. It is useful for reading the error message.
Syntax:
- tail <file name>
Output:
14. tac Command
The tac command is the reverse of cat command, as its name specified. It displays the file content in reverse order (from the last line).
Syntax:
- tac <file name>
Output:
15. more command
The more command is quite similar to the cat command, as it is used to display the file content in the same way that the cat command does. The only difference between both commands is that, in case of larger files, the more command displays screenful output at a time.
In more command, the following keys are used to scroll the page:
ENTER key: To scroll down page by line.
Space bar: To move to the next page.
b key: To move to the previous page.
/ key: To search the string.
Syntax:
- more <file name>
ess Command
The less command is similar to the more command. It also includes some extra features such as ‘adjustment in width and height of the terminal.’ Comparatively, the more command cuts the output in the width of the terminal.
Syntax:
- less <file name>
Output:
Linux User Commands
17. su Command
The su command provides administrative access to another user. In other words, it allows access of the Linux shell to another user.
Syntax:
- su <user name>
Output:
18. id Command
The id command is used to display the user ID (UID) and group ID (GID).
Syntax:
- id
Output:
19. useradd Command
The useradd command is used to add or remove a user on a Linux server.
Syntax:
- useradd username
Output:
20. passwd Command
The passwd command is used to create and change the password for a user.
Syntax:
- passwd <username>
Output:
21. groupadd Command
The groupadd command is used to create a user group.
Syntax:
- groupadd <group name>
Output:
Linux Filter Commands
22. cat Command
The cat command is also used as a filter. To filter a file, it is used inside pipes.
Syntax:
- cat <fileName> | cat or tac | cat or tac |. . .
Output:
23. cut Command
The cut command is used to select a specific column of a file. The ‘-d’ option is used as a delimiter, and it can be a space (‘ ‘), a slash (/), a hyphen (-), or anything else. And, the ‘-f’ option is used to specify a column number.
Syntax:
- cut -d(delimiter) -f(columnNumber) <fileName>
Output:
24. grep Command
The grep is the most powerful and used filter in a Linux system. The ‘grep’ stands for “global regular expression print.” It is useful for searching the content from a file. Generally, it is used with the pipe.
Syntax:
- command | grep <searchWord>
Output:
25. comm Command
The ‘comm’ command is used to compare two files or streams. By default, it displays three columns, first displays non-matching items of th
e first file, second indicates the non-matching item of the second file, and the third column displays the matching items of both files.
Syntax:
- comm <file1> <file2>
Output:
26. sed command
The sed command is also known as stream editor. It is used to edit files using a regular expression. It does not permanently edit files; instead, the edited content remains only on display. It does not affect the actual file.
Syntax:
- command | sed ‘s/<oldWord>/<newWord>/’
Output:
27. tee command
The tee command is quite similar to the cat command. The only difference between both filters is that it puts standard input on standard output and also write them into a file.
Syntax:
- cat <fileName> | tee <newFile> | cat or tac |…..
Output:
28. tr Command
The tr command is used to translate the file content like from lower case to upper case.
Syntax:
- command | tr <‘old’> <‘new’>
Output:
29. uniq Command
The uniq command is used to form a sorted list in which every word will occur only once.
Syntax:
- command <fileName> | uniq
Output:
30. wc Command
The wc command is used to count the lines, words, and characters in a file.
Syntax:
- wc <file name>
Output:
31. od Command
The od command is used to display the content of a file in different s, such as hexadecimal, octal, and ASCII characters.
Syntax:
- od -b <fileName> // Octal format
- od -t x1 <fileName> // Hexa decimal format
- od -c <fileName> // ASCII character format
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