Linux [~/.bashrc] File

This post is intended to show how to interact with the different settings this file offers. Some of the settings that will be discussed here are

1. How to display the server user name in the prompt
2. How to make aliases (or embedded functions) to interact with the console easily.

I use Docker as a practical example to build functions in the CentOS console. I usually like to make tables where I can see information that I am interested in from the command "docker ps", that is the main reason why I build my functions.

User Name Display

• First, run the vi ~/.bashrc command to access the settings file
• After getting access, add the next line of code to display the user name This is an environment variable to fix the user name at the console

PS1='\\u@\\h \\w \\$ '
        

Make Aliases

• First, run the vi ~/.bashrc command to access the settings file
• After getting access, add the next line of code for the desired function or “alias”

# Format
alias new_command_name = '{the command I want to shorcut}'

# Example
alias docker_all      ='docker ps --format "table {{.Names}}\\t{{.Status}}" -a'
alias docker_active   ='docker ps --format "table {{.Names}}\\t{{.Status}}"'
alias docker_all_size ='docker ps --format "table {{.Names}}\\t{{.Size}}" --size -a'        

After Changes

• When changes are effectuated in the ./~bashrc file, you must run the next command to update the shell

source ~/.bashrc        

References

1. What is .bashrc file in Linux?
2. What is the purpose of .bashrc and how does it work?
3. Guide for making functions with .bashrc

#linux #centos #bashscripting #shellscripting #docker #guide #programming #servermanagement