[Solved] You want to write a script that runs with Bash but also works if run with sh script.... Which shebang line should you use to ensure it always runs with Bash when executed directly? | Bash Scripting

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You want to write a script that runs with Bash but also works if run with sh script.sh (without executable permission). Which shebang line should you use to ensure it always runs with Bash when executed directly?

A#!/usr/bin/env bash

B#!/bin/bash

C#!/bin/sh

D#!/usr/local/bin/bash

Step-by-Step Solution

Solution:

Step 1: Understand shebang with env
#!/usr/bin/env bash uses the env command to find Bash in the user's PATH, making it portable.
Step 2: Compare with fixed paths
/bin/bash may not exist on all systems, and /bin/sh is often not Bash. /usr/local/bin/bash is less common.
Step 3: Ensure script runs with Bash when executed directly
Using #!/usr/bin/env bash ensures the script runs with Bash regardless of its location.
Final Answer:
#!/usr/bin/env bash -> Option A
Quick Check:
Use env to find Bash for portability [OK]

Quick Trick: Use #!/usr/bin/env bash for portable Bash scripts [OK]

Common Mistakes:

MISTAKES

Using /bin/sh which may not be Bash
Assuming /bin/bash exists everywhere
Ignoring PATH differences on systems

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Which shebang line should you use to ensure it always runs with Bash when executed directly?

Step 1: Understand shebang with env

Step 2: Compare with fixed paths

Step 3: Ensure script runs with Bash when executed directly

Final Answer:

Quick Check:

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