1. alias Create an alias
2. awk Find and Replace text, database sort/validate/index
3. cal Display a calendar
4. cat Display the contents of a file
5. cd Change Directory
6. cfdisk Partition table manipulator for Linux
7. chgrp Change group ownership
8. chmod Change access permissions
9. chown Change file owner and group
10. chroot Run a command with a different root directory
11. cksum Print CRC checksum and byte counts
12. clear Clear terminal screen
13. cmp Compare two files
14. cp Copy one or more files to another location
15. cron Daemon to execute scheduled commands
16. crontab Schedule a command to run at a later
17. cut Divide a file into several parts
18. date Display or change the date & time
19. dc Desk Calculator
20. dd Data Dump - Convert and copy a file
21. df Display free disk space
22. diff Display the differences between two files
23. dig DNS lookup
24. dir Briefly list directory contents
25. dirs Display list of remembered directories
26. du Estimate file space usage
27. echo Display message on screen
28. egrep Search file(s) for lines that match an extended expression
29. fdformat Low-level format a floppy disk
30. fdisk Partition table manipulator for Linux
32. fgrep Search file(s) for lines that match a fixed stringfile
33. find Search for files that meet a desired criteria
34. format Format disks or tapes
35. free Display memory usage
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