[Linux] Bash printenv Uso equivalente: Print environment variables

The printenv command is used to display the current environment variables in a shell session.

Overview

The printenv command prints all or part of the environment variables that are currently set in your shell. Environment variables are key-value pairs that can affect the behavior of processes on your system.

Usage

The basic syntax of the printenv command is as follows:

printenv [options] [arguments]

Common Options

• -0, --null: Output a null character after each variable instead of a newline.
• variable: If you specify a variable name as an argument, printenv will display the value of that specific variable.

Common Examples

Here are some practical examples of using the printenv command:

1. Display all environment variables:

   printenv
   

2. Display a specific environment variable (e.g., PATH):

   printenv PATH
   

3. Display a specific environment variable (e.g., HOME):

   printenv HOME
   

4. Display all environment variables with null character as delimiter:

   printenv -0
   

Tips

• Use printenv when you need to quickly check the values of environment variables without additional formatting.
• Combine printenv with other commands like grep to filter specific variables. For example:

  printenv | grep USER
  

• Remember that printenv only shows the environment variables that are currently set; it does not modify them. Use commands like export to set or change environment variables.