How to Check if Directory Exists in Bash Script

In bash, you can check if a directory exists using the if [ -d "directory_path" ] test. This condition returns true if the specified directory exists, allowing you to run commands based on that check.

Syntax

The basic syntax to check if a directory exists in bash is:

• if [ -d "directory_path" ]: Tests if the directory exists.
• then: Starts the block of commands to run if the test is true.
• else: (Optional) Runs commands if the directory does not exist.
• fi: Ends the if statement.

bash

if [ -d "directory_path" ]; then
  # commands if directory exists
else
  # commands if directory does not exist
fi

Example

This example checks if the directory /tmp/myfolder exists and prints a message accordingly.

bash

#!/bin/bash

DIR="/tmp/myfolder"

if [ -d "$DIR" ]; then
  echo "Directory $DIR exists."
else
  echo "Directory $DIR does not exist."
fi

Output

Directory /tmp/myfolder does not exist.

Common Pitfalls

Common mistakes when checking directories include:

• Using -f instead of -d, which checks for files, not directories.
• Not quoting the directory path, which can cause errors if the path contains spaces.
• Using single brackets [ ] without spaces around the brackets and operators.

bash

Wrong way (checks for file, not directory):
if [ -f "$DIR" ]; then
  echo "This is a file, not a directory."
fi

Right way:
if [ -d "$DIR" ]; then
  echo "This is a directory."
fi

Quick Reference

Test Option	Description
-d	True if the directory exists
-f	True if the file exists and is a regular file
-e	True if the file or directory exists (any type)

Key Takeaways

Use [ -d "directory_path" ] to check if a directory exists in bash.

Always quote directory paths to handle spaces correctly.

Do not confuse -d (directory) with -f (file).

Use if statements to run commands conditionally based on directory existence.

Remember to include spaces around brackets and operators in bash tests.