1. ls: List directory contents
2. cd: Change directory
3. pwd: Print working directory
4. mkdir: Create a directory
5. touch: Create a file
6. cp: Copy files and directories
7. mv: Move or rename files and directories
8. rm: Remove files and directories
9. find: Search for files and directories
10. grep: Search for patterns in files
11. cat: Concatenate and display files :
12. less: View file contents page by page
13.head: Display the first lines of a file
14. tail: Display the last lines of a file
15. vi/vim: Text editor
16. nano: Text editor
17. tar: Archive and compress files
18. gzip: Compress files
19. gunzip: Decompress files
20. wget: Download files from the web
21. curl: Transfer data to or from a server
22. ssh: Secure shell remote login
23. scp: Securely copy files between hosts
24. chmod: Change file permissions
25. chown: Change file ownership
26. chgrp: Change group ownership
27. ps: Display running processes
28. top: Monitor system resources and processes
29. kill: Terminate processes
30. df: Display disk space usage
31. du: Estimate file and directory space usage
32. free: Display memory usage
33. uname: Print system information
34. ifconfig: Configure network interfaces
35. ping: Test network connectivity
36. netstat: Network statistics
37. iptables: Firewall administration
38. systemctl: Manage system services
39. journalctl: Query the system journal
40. crontab: Schedule cron jobs
41. useradd: Create a user account
42. passwd: Change user password
43. su: Switch user
44. sudo: Execute a command as another user
45. usermod: Modify user account
46. groupadd: Create a group
47. groupmod: Modify a group
48. id: Print user and group information
49. ssh-keygen: Generate SSH key pairs
50. rsync: Synchronize files and directories
51. diff: Compare files line by line
52. patch: Apply a patch to files
53. tar: Extract files from an archive
54. curl: Perform HTTP requests
55. nc: Netcat - networking utility
56. wget: Download files from the web
57. whois: Lookup domain registration details
58. dig: DNS lookup utility
59. sed: Stream editor for text manipulation
60. awk: Pattern scanning and processing language
61. sort: Sort lines in a text file
62. cut: Extract sections from lines of files
63. wc: Word, line, character, and byte count
64. tee: Redirect output to multiple files or commands
65. history: Command history
66. source: Execute commands from a file in the current shell
67. alias: Create command aliases
68. ln: Create links between files
69. uname: Print system information
70. lsof: List open files and processes
71. mkfs: Create a file system
72. mount: Mount a file system
73. umount: Unmount a file system
74. ssh-agent: Manage SSH keys in memory
75. grep: Search for patterns in files
76. tr: Translate characters
77. cut: Select portions of lines from files
78. paste: Merge lines of files
79. uniq: Report or omit repeated lines
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