I would like to write a bash script with unknown amount of arguments.
How can I walk through these arguments and do something with them?
A wrong attempt would look like this:
#!/bin/bash
for i in $args; do
echo $i
done
There's a special syntax for this:
for i do
printf '%s\n' "$i"
done
More generally, the list of parameters of the current script or function is available through the special variable $@.
for i in "$@"; do
printf '%s\n' "$i"
done
Note that you need the double quotes around $@, otherwise the parameters undergo wildcard expansion and field splitting. "$@" is magic: despite the double quotes, it expands into as many fields as there are parameters.
print_arguments () {
for i in "$@"; do printf '%s\n' "$i"; done
}
print_arguments 'hello world' '*' 'special !\characters' '-n' # prints 4 lines
print_arguments '' # prints one empty line
print_arguments # prints nothing
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