Cheat Sheet #day62 - export

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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.

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