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1. sdfdsfsdf
6. df
7. find: Searches for files in a directory hierarchy.
8. sdf
9. chown: Changes file owner and group.
User and Group Management
20. adduser / useradd: Creates a new user.
21. deluser / userdel: Deletes a user.
22. usermod: Modifies a user account.
23. passwd: Changes user password.
24. groupadd: Creates a new group.
25. groupdel: Deletes a group.
26. groupmod: Modifies a group.
Process Management
27. ps: Reports a snapshot of current processes.
28. kill: Sends a signal to a process (often used to terminate a process).
29. killall: Kills processes by name.
30. pkill: Kills processes based on a pattern.
31. systemctl: Manages systemd services.
32. service: Manages system services (legacy).
Networking
33. ip: Shows/manages IP addresses and routing.
34. ifconfig: Configures network interfaces (deprecated, replaced by ip).
35. ping: Sends ICMP ECHO_REQUEST packets to network hosts.
36. netstat: Displays network connections, routing tables, interface statistics, etc.
(deprecated, replaced by ss).
37. ss: Utility to investigate sockets.
38. traceroute: Prints the route packets take to the network host.
39. nslookup: Queries DNS servers (deprecated, use dig).
40. dig: DNS lookup utility.
41. curl: Transfers data from or to a server.
42. wget: Non-interactive network downloader.
Disk Management
43. fdisk: Partition table manipulator for Linux.
44. parted: A partition manipulation program.
45. mkfs: Builds a Linux file system.
46. mount: Mounts a file system.
47. umount: Unmounts a file system.
48. fsck: Checks and repairs a Linux file system.
49. blkid: Looks up or lists block device attributes.
Package Management
50. apt-get / apt: APT package handling utility (Debian/Ubuntu).
51. yum / dnf: Package manager for RPM-based distributions (CentOS, Fedora).
52. zypper: Command line interface of ZYpp package manager (openSUSE).
Log Management
53. tail: Outputs the last part of files.
54. less: Views file contents interactively.
55. journalctl: Views logs collected by systemd.
Security
56. iptables: Administers IP packet filter rules.
57. ufw: Uncomplicated firewall, frontend for iptables (Ubuntu).
58. firewalld: Dynamic firewall manager (RHEL/CentOS).
System Monitoring and Performance
59. iostat: Reports CPU and I/O statistics.
60. vmstat: Reports virtual memory statistics.
61. free: Displays memory usage.
Miscellaneous
62. cron: Schedules tasks to run at intervals.
63. at: Schedules commands to run at a particular time.
64. echo: Displays a line of text.
65. alias: Creates an alias for a command.
66. grep: Searches text using patterns.
67. awk: A pattern scanning and processing language.
68. sed: Stream editor for filtering and transforming text.
