All variables in a shell script are global unless specifically declared as local. Local variables can be used only inside a function.
#!/bin/bash
# Global and local variables
carwash()
{
local vin="17DIGITS"
echo "IN Carwash. Your windscreen is:" $1 "and your VIN is:" $vin
post_carwash_status="BEARY CLEAN"
}
status="DIRTY"
carwash $status
echo "After carwash. Your windscreen is:" $status "and your VIN: " $vin
echo "Post Carwash Status: " $post_carwash_status
OUTPUT
IN Carwash. Your windscreen is: DIRTY and your VIN is: 17DIGITS
After carwash. Your windscreen is: DIRTY and your VIN:
Post Carwash Status: BEARY CLEAN
Notice that the local variable vin is not available outside the function.
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