Hello, World
The smallest Bash script, echo and printf, and why to quote variables.
Runs in Zerethon IDE · Bash 5.2
Official Bash documentation ↗
A Bash script is a list of commands run from top to bottom. echo prints its arguments and a newline; printf prints exactly the format you give it.
main.sh
#!/usr/bin/env bash
echo "Hello, World!"
echo "Sum: $((2 + 3))"
printf '%s-%s!\n' a b
name="Ada"
echo "Hi, $name"Output
Hello, World! Sum: 5 a-b! Hi, Ada
- Double quotes expand variables (
"$name"); single quotes keep every character as written ('$name'). - Quote variables when you use them:
"$file"keeps a name with spaces as one argument. - The first line
#!/usr/bin/env bash(the shebang) tells a system which interpreter to use. Run uses Bash either way.