Here documents in bash explained
Introduction Input/output redirection is an extremely important aspect of writing bash shell scripts and working with the bash shell command…
Using ShellCheck to write better shell scripts
Introduction Over the course of the last couple of years we’ve written numerous posts on understanding and experimenting with different…
Shell scripting: watch command alternative via while loop
We may frequently find ourselves in situations where we want to run a command periodically to view its progress. A watch…
How to replicate user passwords across hosts using /etc/shadow file
Introduction Today I received an interesting requirement. A customer wanted their FTP users on several new servers (having the same…
14 tail and head commands in Linux/Unix
Many people know about cat command which is useful in displaying entire file content. But in some cases we have…
How to simulate yes/No in Linux scripts/commands
In some situations when executing a command or a Linux shell script we may require some manual intervention. The yes…
Shell scripting: Convert a string from lowercase to uppercase
The linux shell has provided us with many hidden gems. Some of things are string manipulation without using external commands…
How to execute/run Linux Shell scripts
In this post we will see how to run a shell script you just received or created. There are many…
Linux Shell script to rename files from CAPS to small letters
This is a small script to rename multiple files from CAPITAL to small letters. Ok, why we require to do…
Linux Shell script to close/open ports on a firewall/Iptables
This is a small script which will takecare of blocking and unblocking ports by asking user about his desire. Just…
