BASIC LINUX COMMANDS
1.mkdir :- mkdir command is used to create an empty directory.
Syntax:- mkdir <folder name>
2. cd: — cd command is used to change the directory.
Syntax: — cd <directory name>
3. top: — top command is used to show all process which is active and sleeping.
Syntax: — top
4. info: — info reads documentation in the info format.
Syntax: — info [option] [menu item]
5. touch:- touch command is used to create an empty file.
Syntax: — touch <file name>
6. rm: — rm command is used to remove the file from the directory.
Syntax: — rm <file name>
7. man: — man command is the interface of the on-line reference manual.
Syntax: — man <command name>
8. rmdir:- rmdir command is used to remove the directory.
Syntax: — rmdir <directory name>
9. apropos: — apropos is used to search the manual page name and description.
Syntax: — apropos <command name>
10. cat:- cat command is used to see and write the contents of the file.
Syntax: — cat >> <file name> <content> (to write)
cat <file name>
11. echo: — echo command is used to display the text.
Syntax: — echo <text to be displayed>
12. ps: — ps command is used to report the snapshot of the current processes.
Syntax: — ps <option>
13. mv: — mv command is used to move 1 file from 1 directory to another.
Syntax: — mv <file name> <directory to be moved>
14. mail: — mail command is used to send an email to the specific mail id with the subject.
Syntax: — mail –s[subject] mailid
After writing the content, press ctrl+d
15. hostname: — hostname command is used to display the hostname of the kernel.
Syntax: — hostname
16. uname: — uname command is used to print the system information.
Syntax: — uname
17. chmod: — chmod command is used to change the permission of files or directories.
Syntax: — chmod u=rwx,g=rx,o=r, demo1.txt
18. umask: — umask command is used to return or set the value of the system file mode.
Syntax: — umask
19. who: — who command is used to display the list of users.
Syntax: — who
20. whoami: — whoami command is used to display the current user logged in.
Syntax: — whoami
21. ls-l: — ls –l command is used to display files and directories in detail.
Syntax: — ls –l
22. ls-a: — ls –a command is used to display hidden files and directories.
Syntax: — ls –a
23. date: — date command is used to display the current date
Syntax: — date
24. cal: — cal command is used to view the calendar.
Syntax: — cal
cal <month> <year>
25. bc: — bc is bash calculator, bc command is used for arithmetic operation.
Syntax: — bc <arithmetic problem>
26. wc: — wc command is used for counting of words in the file.
Syntax: — wc <file name>
27. pipe: — pipe command is used to feed output of one command to another command as an input.
Syntax: — <first command> | <output command>
28. whatis: — whatis command is used to list the usage of command in one line.
Syntax: — whatis <command name>
29. type: — type command is used to display the information of the Linux command whether it is aliased, file, shell built, etc.
Syntax: — type <file name>
30. pwd: — pwd command is used to display the present working directory.
Syntax: — pwd
31. cmp: — cmp command is used to compare two files byte by byte.
Syntax: — cmp <file1> <file2>
32. comm: — comm command is used to compare two sorted files line by line.
Syntax: — cmp <file1> <file2>
33. id: — id command is used to display real and effective user and group id.
Syntax: — id
34. alias: — alias command is used to replace one string with another while execution.
Syntax: — alias string=’command’
unalias: — unalias command is used to remove the function of the alias.
Syntax: — unalias charactername
35. gzip: — gzip command is used to compress the file.
Syntax: — gzip <file name>
gunzip: — gunzip command is used to expand the file.
Syntax: — gunzip <file name>
36. sort: — sort command is used to sort the contents of the file.
Syntax: — sort <file name>
