Cheat Sheet #day62 - export

export Command Cheatsheet

The export command in Unix-like systems is used to set environment variables, making them available to subprocesses. Here's a quick reference guide:

Basic Syntax

export VAR_NAME=value

Common Options

• Set an environment variable:

    export PATH=$PATH:/new/path
  

• Export a variable with spaces in its value:

    export MY_VAR="This is a value"
  

Useful Commands and Examples

1. Set and export a variable:

    export VAR_NAME="value"
   

2. Append to an existing PATH variable:

    export PATH=$PATH:/usr/local/bin
   

3. Export multiple variables:

    export VAR1="value1" VAR2="value2"
   

4. Export a variable for a specific command:

    VAR_NAME=value command
   

5. List all exported variables:

    export -p
   

6. Unset an environment variable:

    unset VAR_NAME
   

Example Usage in Scripts

• Setting an environment variable in a script:

    #!/bin/bash
    export DATABASE_URL="mysql://user:password@localhost/db"
  

• Using export in a pipeline:

    export MY_VAR="hello"
    some_command | another_command
  

Additional Information

• Help option for export:

    help export
  

• View export manual page:

    man bash
  

This cheatsheet covers the basic usage and common scenarios for the export command. For more detailed information, refer to the man page or use help export.