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90 Linux Commands used by Linux Sysadmins

1. ip – from Iproute2, a collection of utilities for controlling TCP/IP networking and traffic control in Linux.

2. ls – list directory contents.

3. df – display disk space usage.

4. du – estimate file space usage.

5. free – display memory usage.

6. scp – securely Copy Files Using SCP, with examples.

7. find – locates files based on some user-specified criteria.

8. ncdu – a disk utility for Unix systems.

9. pstree – display a tree of processes.

10. last – show a listing of last logged in users.

11. w – show a list of currently logged in user sessions.

12. grep – Search a file for a pattern of characters, then display all matching lines.

13. uptime – shows system uptime and load average.

14. top – shows an overall system view.

15. vmstat – shows system memory, processes, interrupts, paging, block I/O, and CPU info.

16. htop – interactive process viewer and manager.

17. dstat – view processes, memory, paging, I/O, CPU, etc., in real-time. All-in-one for vmstat, iostat, netstat, and ifstat.

18. iftop – network traffic viewer.

19. nethogs – network traffic analyzer.

20. iotop – interactive I/O viewer. Get an overview of storage r/w activity.

21. iostat – for storage I/O statistics.

22. netstat – for network statistics.

23. ss – utility to investigate sockets.

24. atop – For Linux server performance analysis.

25. Glances and nmon – htop and top Alternatives:

26. ssh – secure command-line access to remote Linux systems.

27. sudo – execute commands with administrative privilege.

28. cd – directory navigation.

29. pwd – shows your current directory location.

30. cp – copying files and folders.

31. mv – moving files and folders.

32. rm – removing files and folders.

33. mkdir – create or make new directories.

34. touch – used to update the access date and/or modification date of a computer file or directory.

35. man – for reading system reference manuals.

36. apropos – Search man page names and descriptions.

37. rsync – remote file transfers and syncing.

38. tar – an archiving utility.

39. gzip – file compression and decompression.

40. b2zip – similar to gzip. It uses a different compression algorithm.

41. zip – for packaging and compressing (to archive) files.

42. locate – search files in Linux.

43. ps – information about the currently running processes.

44. Making use of Bash scripts. Example: ./bashscript.sh

45. cron – set up scheduled tasks to run.

46. nmcli – network management.

47. ping – send ICMP ECHO_REQUEST to network hosts.

48. traceroute – check the route packets take to a specified host.

49. mtr – network diagnostic tool.

50. nslookup – query Internet name servers (NS) interactively.

51. host – perform DNS lookups in Linux.

52. dig – DNS lookup utility.

53. wget – retrieve files over HTTP, HTTPS, FTP, and FTPS.

54. curl – transferring data using various network protocols. (supports more protocols than wget)

55. dd – convert and copy files.

56. fdisk – manipulate the disk partition table.

57. parted – for creating and manipulating partition tables.

58. blkid – command-line utility to locate/print block device attributes.

59. mkfs – build a Linux file system.

60. fsck – tool for checking the consistency of a file system.

61. whois – client for the whois directory service.

62. nc – command-line networking utility. (Also, see 60 Linux Networking commands and scripts.)

63. umask – set file mode creation mask.

64. chmod – change the access permissions of file system objects.

65. chown – change file owner and group.

66. chroot – run command or interactive shell with a special root directory.

67. useradd – create a new user or update default new user information.

68. userdel – used to delete a user account and all related files.

69. usermod – used to modify or change any attributes of an existing user account.

70. vi – text editor.

71. cat – display file contents.

72. tac – output file contents, in reverse.

73. more – display file contents one screen/page at a time.

74. less – similar to the more command with additional features.

75. tail – used to display the tail end of a text file or piped data.

76. dmesg – prints the message buffer of the kernel ring.

77. journalctl – query the systemd journal.

78. kill – terminate a process.

79. killall – Sends a kill signal to all instances of a process by name.

80. sleep – suspends program execution for a specified time.

81. wait – Suspend script execution until all jobs running in the background have been terminated.

82. nohup – Run Commands in the Background.

83. screen – hold a session open on a remote server. (also a full-screen window manager)

84. tmux – a terminal multiplexer.

85. passwd – change a user’s password.

86. chpassword –

87. mount / umount – provides access to an entire filesystem in one directory.

88. systemctl – Managing Services (Daemons).

89. clear – clears the screen of the terminal.

90. env -Run a command in a modified environment.

91. cheat – allows you to create and view interactive cheatsheets on the command-line.”

92. tldr – Collaborative cheatsheets for console commands.

93. bashtop – the β€˜cool’ top alternative.

94. bpytop – Python port of bashtop.