Linux / Unix Command Examples

Here are links to some useful Linux tips:

https://www.cyberciti.biz/faq/linux-unix-appleosx-bsd-cat-command-examples/

https://peteris.rocks/blog/htop/

https://www.cyberciti.biz/faq/searching-multiple-words-string-using-grep/

https://www.cyberciti.biz/faq/using-sed-to-delete-empty-lines/

https://www.cyberciti.biz/faq/linux-hide-processes-from-other-users/

https://www.cyberciti.biz/faq/bash-check-if-process-is-running-or-notonlinuxunix/

https://www.cyberciti.biz/faq/unix-linux-bsd-appleosx-bash-assign-variable-command-output/

http://unixmillenniumbug.com/

https://bash.cyberciti.biz/file-management/linux-shell-script-to-reduce-pdf-file-size/

https://www.cyberciti.biz/faq/bash-file-command-not-found-how-to-install-file/

https://www.cyberciti.biz/faq/set-up-a-basic-iptables-firewall-on-amazon-linux-ami/

https://www.cyberciti.biz/faq/fedora-redhat-centos-5-6-disable-firewall/

https://bash.cyberciti.biz/virtualization/shell-script-to-setup-an-lxd-linux-containers-vm-lab-for-testing-purpose/

https://hackertarget.com/ossec-introduction-and-installation-guide/

Awesome. VIM “for people who don’t want to use it , but have to…”. Or see my page https://www.cyberciti.biz/faq/linux-unix-vim-save-and-quit-command/

sudo is the right choice for granting admin rights on the CentOS Linux 8 server. Learn how to create a new user and grant her admin rights https://www.cyberciti.biz/faq/add-create-a-sudo-user-on-centos-linux-8/

638 Comments

  1. Tomi Engdahl says:

    https://hackaday.com/2023/04/18/linux-fu-reading-your-memorys-memory/

    Reply
  2. Tomi Engdahl says:

    https://hackaday.com/2023/05/05/linux-fu-supercharge-bash-history/

    Reply
  3. Tomi Engdahl says:

    https://hackaday.com/2023/05/09/wordstar-reborn/
    https://sourceforge.net/projects/wordtsar/

    Reply
  4. Tomi Engdahl says:

    https://hackaday.com/2023/05/24/linux-fu-making-progress/

    The pv program can do some of the things you want. It monitors data through a pipe or, at least through its standard output. Think of it as cat with a meter.

    By default, pv will show a progress bar, an elapsed time, an estimated end time, a rate, and a total number of bytes. You can turn any of that off or add things using command line options. You can also specify things like the size of the terminal if it should count lines instead of bytes, and, in the case where the program doesn’t know what it is reading, the expected size of the transfer.

    Of course, the output of pv is to stderr so it shows up on the screen. This makes it tricky if you want to use it with something like dialog that wants the stdout to be the progress indication. Luckily, you can redirect stderr to stdout and then redirect stdout to a file. Just be sure to do it in that order.

    Another Way

    There is also progress. It looks around for programs running like cp, mv, dd, and many more, looks at their open files, and shows you progress information for those programs. It only does this once, so you’ll typically marry it with the watch command or use the -M option.

    Note that since gzip is one of the programs that progress knows about

    As usual with Linux, there are always many ways to do anything. If you are a masochist, you could use ptrace to look inside a program and figure things out from there. You could also do the same trick that progress does and look through a program’s /proc entries.

    If you want to add a progress bar to your shell scripts directly, try gum. Or maybe combine progress with widgets to put the result on your desktop?

    Reply
  5. Tomi Engdahl says:

    https://www.cyberciti.biz/faq/how-to-check-how-long-a-process-has-been-running/

    Reply
  6. Tomi Engdahl says:

    https://www.tecmint.com/prevent-ssh-brute-force-login-attacks/

    Reply
  7. Tomi Engdahl says:

    Linux Fu: Easy And Easier Virtual Networking
    https://hackaday.com/2023/06/14/linux-fu-easy-and-easier-virtual-networking/

    Reply
  8. Tomi Engdahl says:

    https://www.tecmint.com/vnc-desktop-access-from-web-browser/

    Reply
  9. Tomi Engdahl says:

    https://www.tecmint.com/funny-linux-commands/

    Reply
  10. Tomi Engdahl says:

    https://pimylifeup.com/linux-sleep-command/

    Reply
  11. Tomi Engdahl says:

    https://www.tecmint.com/find-linux-processes-memory-ram-cpu-usage/

    Reply
  12. Tomi Engdahl says:

    https://www.tecmint.com/find-top-large-directories-and-files-sizes-in-linux/

    Reply
  13. Tomi Engdahl says:

    https://www.tecmint.com/ifconfig-command-examples/?fbclid=IwAR3XlJayktr9ULg5obI0d3ZY09fSzGY2Fq5w2k7ARcA3AfW77EctBNY2WlY

    Reply
  14. Tomi Engdahl says:

    https://www.tecmint.com/create-alias-in-linux/?fbclid=IwAR1bQApodowjoiA9eXUwvD9GTyO-9c0YGAHFbEU97bNeHXGpl8PinMS0g50

    Reply
  15. Tomi Engdahl says:

    https://www.tecmint.com/view-colored-man-pages-in-linux/

    Reply
  16. Tomi Engdahl says:

    https://www.tecmint.com/use-linux-awk-command-to-filter-text-string-in-files/

    Reply
  17. Tomi Engdahl says:

    https://www.tecmint.com/sudoers-configurations-for-setting-sudo-in-linux/

    Reply
  18. Tomi Engdahl says:

    https://github.com/uutils/coreutils
    Cross-platform Rust rewrite of the GNU coreutils

    Reply
  19. Tomi Engdahl says:

    https://www.tecmint.com/empty-delete-file-content-linux/

    Reply
  20. Tomi Engdahl says:

    https://www.tecmint.com/download-mp3-song-from-youtube-videos/

    Reply
  21. Tomi Engdahl says:

    https://www.tecmint.com/gui-tools-for-linux-system-administrators/

    Reply
  22. Tomi Engdahl says:

    https://www.thetechedvocate.org/10-best-linux-terminal-emulators/

    Reply
  23. Tomi Engdahl says:

    https://www.tecmint.com/testssl-sh-test-tls-ssl-encryption-in-linux-commandline/

    Reply
  24. Tomi Engdahl says:

    Linux Directories Explained in 100 Seconds
    https://www.youtube.com/watch?v=42iQKuQodW4

    Reply
  25. Tomi Engdahl says:

    https://hackaday.com/2023/07/10/suc-aims-to-replace-slack-in-five-lines-of-bash/

    Reply
  26. Tomi Engdahl says:

    https://www.facebook.com/groups/2600net/permalink/3676867062536392/

    Steve Wilson lol had this random idea to pipe a USB connection over SSH. you can totally do it lol.

    On your local machine: ssh -R1234:localhost:1234 [email protected]

    This opens port 127.0.0.1:1234 on remote.example.com which then connects to 127.0.0.1:1234 on your local machine.

    Now you use socat to connect to the serial line of your USB:

    On your local machine: socat -d -d -d tcp-listen:1234,reuseaddr,fork,bind=127.0.0.1 /dev/ttyUSB0

    TCP -> Pipe
    On the other side, if the software cannot use TCP but wants to talk to a pipe or tty, you can use socat again to provide that:

    On the remote: socat -d -d -d unix-listen:.mypipe tcp-connect:127.0.0.1:1234

    Now let your remote software connect to .mypipe and it is transparently connected to /dev/ttyUSB0 on your local computer.

    But your mileage may vary. It depends heavily what your software in the cloud needs.

    End quote.

    Now FIGHT!!! and tell him how this is impossible, 2600 “hackers”.

    #2600 #hackers #learnsomethingnew #2600net #usbhacks #linux #socat

    Reply
  27. Tomi Engdahl says:

    Linux Fu: The Old School Terminal
    https://hackaday.com/2023/08/23/linux-fu-the-old-school-terminal/

    Reply
  28. Tomi Engdahl says:

    https://hackaday.com/2023/09/08/linux-fu-build-a-better-ls/

    Reply
  29. Tomi Engdahl says:

    https://hackaday.com/2023/09/27/explore-linux-space-time/

    Reply
  30. Tomi Engdahl says:

    https://www.phoronix.com/news/Milk-V-Duo-Linux-Patches

    Reply
  31. Tomi Engdahl says:

    https://hackaday.com/2023/10/17/linux-fu-deep-git-rebasing/

    Reply
  32. Tomi Engdahl says:

    https://www.redhat.com/sysadmin/ssh-automation-sshpass

    Reply
  33. Tomi Engdahl says:

    https://www.cyberciti.biz/faq/how-to-check-for-ssh-connectivity-in-a-shell-script/

    https://bash.cyberciti.biz/security/expect-ssh-login-script/

    Reply
  34. Tomi Engdahl says:

    https://www.tecmint.com/linux-sed-command-tips-tricks/

    Reply
  35. Tomi Engdahl says:

    https://www.tecmint.com/best-notepad-alternatives-for-linux/

    Reply
  36. Tomi Engdahl says:

    https://www.tecmint.com/tilix-gtk3-tiling-terminal-emulator-for-linux/

    Reply
  37. Tomi Engdahl says:

    https://www.tecmint.com/linux-network-bandwidth-monitoring-tools/

    Reply
  38. Tomi Engdahl says:

    https://pimylifeup.com/using-ntp-on-linux-with-chrony/

    Reply
  39. Tomi Engdahl says:

    Git-palvelimen ylläpitäminen
    https://shell.sendanor.fi/gitolite.html?fbclid=IwAR0Wwk1a9tj4u3Afc8bfx5MBkTKkyRjPSM0k1JtRlSo2UObWB9jLRff6MhU_aem_AXm8oLel9uw3-4IKGt3HU5CTyMfAFL5JtD5FpOMg-VSrxyuOfx-1OLsUDaiWnw9zYTNRJN3gHjet0O5TCVeWn9tv

    https://www.sendanor.fi/shells??t=YEARLY

    Reply
  40. Tomi Engdahl says:

    https://www.tecmint.com/linux-terminal-file-managers/

    https://www.tecmint.com/linux-terminal-file-managers/

    Reply
  41. Tomi Engdahl says:

    https://github.com/green-green-avk/AnotherTerm

    Reply
  42. Tomi Engdahl says:

    https://www.tecmint.com/run-linux-live-images-from-hard-disk-in-linux/

    Reply
  43. Tomi Engdahl says:

    https://www.tecmint.com/download-youtube-videos-linux/

    Reply
  44. Tomi Engdahl says:

    https://www.cyberciti.biz/faq/linux-run-a-command-with-a-time-limit/

    Reply
  45. Tomi Engdahl says:

    https://imzye.com/Shell/bash/concurrency-in-bash/

    Reply
  46. Tomi Engdahl says:

    https://flarexes.com/linux-firejail-securely-throw-untrusted-applications-behind-bars

    Reply
  47. Tomi Engdahl says:

    https://www.howtogeek.com/fun-linux-commands/

    Reply
  48. samm says:

    To use different command in Linux

    Reply
  49. Tomi says:

    https://hackaday.com/2024/01/17/linux-fu-wheres-that-darn-file/

    Reply
  50. Tomi Engdahl says:

    https://www.tecmint.com/execute-commands-on-multiple-linux-servers-using-pssh/

    Reply

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