BASH Shell related tutorial/FAQ

Linux Quiz

last updated March 10, 2020 in BASH Shell, Linux, UNIX

Let us test your basic knowledge of Linux systems, including commands.

Explain DEBIAN_FRONTEND apt-get variable for Ubuntu / Debian

last updated January 27, 2020 in BASH Shell, Debian / Ubuntu, Package Management, Ubuntu Linux

Can you explain DEBIAN_FRONTEND apt or apt-get variable? How and why I need to use this in Docker or shell scripts under a Debian and Ubuntu Linux?

How do I count how many processes are running in Linux?

last updated December 21, 2019 in BASH Shell, CentOS, Commands, FreeBSD, Linux, RedHat and Friends, Suse, Ubuntu Linux, UNIX

How do I see how many processes are running in Linux? How can count all running processes in Linux?

How to add bash auto completion in CentOS 8 Linux

last updated December 11, 2019 in BASH Shell, CentOS, Linux

I set up a new cloud server, but my auto-completion of bash shell commands are not working. How do I enable autocomplete feature in CentOS 8 (CentOS Enterprise Linux 8)? How do I write simple bash completion code in CentOS 8?

How to return pid of a last command in Linux / Unix

last updated November 19, 2019 in BASH Shell, Linux, UNIX

I need to find and return the PID of the last command executed in Linux. How do I return the PID of command in Linux?

Bash get filename from given path on Linux or Unix

last updated November 14, 2019 in BASH Shell, Linux, Mac OS X, UNIX

How do I extract filename and extension in the Bash shell script from the given path? How can I get filename from the path under the bash shell?

How to find a website’s DNS (name server) address

last updated November 3, 2019 in BASH Shell, Linux, UNIX, Windows

How can I find a website’s DNS address? How do I check the current DNS servers of a domain or website using a Linux or macOS command line option? How do I find DNS address of a website using bash?

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