whatis shebang
Shebang
Also known as: #!, hashbang
The #! line at the top of a script that tells the kernel which interpreter should run it, such as #!/usr/bin/env bash.
What Is a Shebang (#!) in Linux?
When you execute a file, the kernel checks its first two bytes. If they are #!, it runs the named interpreter and passes the script path as an argument. Without a shebang, the script runs in whatever shell happened to launch it.
#!/usr/bin/env bash finds bash through PATH, which is more portable than hard-coding /bin/bash. The file also needs the execute bit, set with chmod +x script.sh.
Example
#!/usr/bin/env bash
echo "hello"Learn more about Shebang
- Writing Your First Bash Script A practical introduction to Bash scripting: the shebang line, variables, arguments, conditionals, loops, and functions, with runnable examples you can adapt for real automation tasks.