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Linux and Unix tutorials for new and seasoned sysadmin

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Check if a directory exists in Linux or Unix shell

last updated May 21, 2019 in Categories BASH Shell, KSH Shell, Linux, UNIX

I need to check if a directory exists or not, within a shell script running on Linux or Unix-like system? How do I check if a directory exists in a shell script?

1 Comment

How to check hard drive health on FreeBSD

last updated May 20, 2019 in Categories FreeBSD, Hardware, Troubleshooting, UNIX

How do I read my hard disk/SSD health using smartctl command on FreeBSD operating system? How can I hard drive health on FreeBSD and find out if my disk is dying?

1 Comment

How to rename multiple folders in Linux using command line

last updated May 19, 2019 in Categories BASH Shell, Linux, UNIX

I am new to Linux programming and bash shell commands. I have a folder structure as dir1, dir2, dir3 and I would like to rename it as dir001, dir002, dir003. How do you rename multiple folders in Linux?

1 Comment

Use oathtool Linux command line for 2 step verification (2FA)

last updated May 11, 2019 in Categories CentOS, Debian / Ubuntu, Linux, RedHat and Friends, Security, Suse

I do not wish to use Google Authenticator or Authy app that generates 2 step verification (2FA) codes on my iOS/Android phone. Is there any way I can produce 2FA codes from Linux command line for popular sites such as Gmail, Twitter, Facebook, Amazon and more?

7 Comments

How to upgrade Fedora 29 to Fedora 30

last updated April 30, 2019 in Categories Fedora Linux, Linux, Package Management

How do I upgrade to Fedora 30 from Fedora 29 Using the dnf command? How can I update F29 to F30? Can you tell me the procedure to upgrade Fedora 29 to Fedora 30?

1 Comment

How to check running process in Ubuntu using command line

last updated April 17, 2019 in Categories Linux, Ubuntu Linux

I am a new sysadmin for the Ubuntu operating system. How do I check running process in Ubuntu using the command line option?

2 Comments

Linux disable firewall command

last updated April 16, 2019 in Categories Iptables, Linux, Networking, Security

I am a new Linux system administrator. I have a hardware-based firewall, so I don’t need a firewall on each server. How do I disable the firewall on Linux?

2 Comments

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