BASH Shell related tutorial/FAQ

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?

Change default shell to bash on Macos Catalina

last updated October 8, 2019 in BASH Shell, Mac OS X, UNIX

I noticed that my default shell set to zsh on Macos Catalina. How do I change my default shell to bash on Macos Catalina using the command line or GUI options?

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