Using $1 in shell script

I'm trying to write a rule to decrypt PDF files with qpdf, which requires both input & output filename.

So given the input filename $1, how do I generate the output filename to be equal to $1 but with, say, 'decrypted.pdf' at the end?

I tried

Code: Select all: qpdf --decrypt --password=xxx $1 "$1_decrypted.pdf"

but it gives an error.

I also tried

Code: Select all: qpdf --decrypt --password=xxx $1 `"$1"_decrypted.pdf`

and

Code: Select all: f="$1"_decrypted.pdf; qpdf --decrypt --password=xxx $1 $f

and so on.

Ideally, I would like to parse just the filename without extension, and add 'decrypted' to that.

Keep in mind that $1 is the full path and not just the filename. Search around for shell scripting resources on the net as there are various ways to extract the different parts of the path/filename. Also, it's a good practice to have $1 in double-quotes, in case the path has spaces in it.

Well, all those attempts were my best shot at scripting to add a suffix.

They worked in Terminal, but not within Hazel.

Can you give me a simple 'add suffix xxx to the output filename' script?

I did some homework and got this ...

if $f is

Code: Select all: "/Volumes/HD/Users/z/aa bb.pdf"

then this in Terminal:

Code: Select all: echo $(dirname $f)/$(basename $f ".pdf")_decrypted.pdf

gives

Code: Select all: "/Volumes/HD/Users/z/aa bb_decrypted.pdf"

but this within Hazel gives errors:

Code: Select all: qpdf --decrypt --password=xxx "$1" \"$(dirname "$1")/$(basename "$1" ".pdf")_decrypted.pdf\"

I'm probably not getting all the quoting right

OK, I got it!

Code: Select all: o=$(dirname "$1")/$(basename "$1" ".pdf")_decrypted.pdf; qpdf --decrypt --password=xxx "$1" "$o"