The Shebang Line
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The Shebang Line
The first line of a script, #!/bin/bash, is the shebang — it tells the operating system which interpreter should run the file when executed directly. Without it, ./script.sh might use the wrong shell and behave unexpectedly. The shebang must be the very first line, with no blank line above it.
Note: #!/usr/bin/env bash is a more portable shebang that finds bash wherever it is on the PATH.
Example: The Shebang Line
#!/bin/bash
# This shebang tells the OS to run this file with bash
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