Bash script help

[Yes]

Since my ACPI handler.sh script isn't working like it should, I need to write my own. What it needs to do is test whether `acpi -a` equals "Adapter 0: on-line" or "Adapter 0: off-line". Here's what I've tried...



!#/bin/sh

power_source = `acpi -a`
if [$power_source = "Adapter 0: on-line"]
then
echo "Using AC power"
else
echo "Using battery"
fi

What it does, however, is print out "Using battery" even when acpi -a says the AC adapter is on-line. So I assume it's a problem with my if statement, right? What's wrong with it though, I haven't been able to figure out.

So, any help would be greatly appreciated. Thanks!

[hannaman]

Since my ACPI handler.sh script isn't working like it should, I need to write my own. What it needs to do is test whether `acpi -a` equals "Adapter 0: on-line" or "Adapter 0: off-line". Here's what I've tried...



!#/bin/sh

power_source = `acpi -a`
if [$power_source = "Adapter 0: on-line"]
then
echo "Using AC power"
else
echo "Using battery"
fi

What it does, however, is print out "Using battery" even when acpi -a says the AC adapter is on-line. So I assume it's a problem with my if statement, right? What's wrong with it though, I haven't been able to figure out.

So, any help would be greatly appreciated. Thanks!

$power_source is most likely empty, you shouldn't put spaces around the equal sign in variable assignment.

Also, using the $power_source variable like that in the test statement doesn't preserve spaces. You should enclose the variable in double quotes. And also put spaces around the brackets in the test statement.

[Yes]

Ah I hadn't realized whitespace was so important in bash. Thank you!