BASH Shell related tutorial/FAQ

How to print filename with awk on Linux / Unix

February 3, 2018in BASH Shell, Linux, UNIX last updated February 3, 2018

I would like to print filename with awk on Linux / Unix-like system. How do I print filename in BEGIN section of awk? Can I print the name of the current input file using gawk/awk?

How to disable bash shell history in Linux

January 30, 2018January 30, 2018in BASH Shell, Linux, UNIX last updated January 30, 2018

I do not want to save root users’ shell history. How do I force Linux or Unix server to forget bash shell history? How to disable bash shell history on Linux for the root user?

How to redirect standard error in bash

January 29, 2018January 29, 2018in BASH Shell, Linux, UNIX last updated January 29, 2018

I am trying to redirect bash message into file named output.log. But, it is not getting redirected. How do I redirect both standard output and standard error in bash shell? In Linux, how do I redirect error messages?
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Turn off color in Linux terminal/bash session

January 3, 2018January 24, 2018in BASH Shell, CentOS, Debian / Ubuntu, Linux, RedHat and Friends, Suse last updated January 24, 2018

I am a new GNU/Linux user. I see a colorful bash prompt. Traditional command such as grep command or ls command also display output in colors. I would also like a turn off colors in vim text editor. I do not like colors. How can I turn off color listing in Linux terminal?

How to use/run bash aliases over ssh based session

December 26, 2017December 26, 2017in BASH Shell, Linux, OpenBSD, Troubleshooting, UNIX last updated December 26, 2017

I have set up a bash alias named file_repl. It works entirely when I log in using ssh command. However, my bash aliases are not running over ssh, for example:
$ ssh vivek@server1.cyberciti.biz file_repl bash: file_repl: command not found
How do I run bash shell aliases when I use ssh command?

Unix command to find a file in a directory and subdirectory

December 20, 2017December 24, 2017in BASH Shell, Linux, UNIX last updated December 24, 2017

I think I lost (or forgot the file location) a file named toms-first-birthday.mp4 on my Unix based system. Is there is a Unix bash shell command to find a file called “toms-first-birthday.mp4” in a directory and subdirectories?

How to find and tar files into a tar ball

December 15, 2017December 27, 2017in BASH Shell, Linux, UNIX last updated December 27, 2017

I would like to find all documents file *.doc and create a tarball of those files and store in /nfs/backups/docs/file.tar. Is it possible to find and tar files on a Linux or Unix-like system?

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