Get all .pdf file in a folder and do shell script

Question

Hi, I need to convert many pdf to ps using pdf2ps, and I'm try to do this with applescript:
tell application "Finder"
set pdf_folder to (choose folder)
set pdf_path to POSIX path of (item of folder pdf_folder whose name...)
end tell
repeat with k in pdf_path
set kl to ... -- same of k but with extension .ps
do shell script ("pdf2ps "&k&" "&kl)
end repeat
but I don't know how implement that.
Can anyone help me?
Thanks!

Answer 1

01. The 'tell application "Finder" ... end tell' code block is not required to call 'choose folder'. View the 'Standard Additions' dirctionary.
02. 'choose folder' returns a single alias - if only a single folder is to be selected, or a list of 'alias'es - if 'multiple selection allowed' is set to true.
03. 'pdf2ps' is not part of Apples' UNIX commands installation; and you did not provide a valid URL for others to download the UNIX command.
Code to process only a single selected folder.
-- Code starts here --
try
do shell script ("pdf2ps " & (quoted form of (POSIX path of ((choose folder) as string))))
end try
-- Code ends here --
Code to process multiple selected folders.
-- Code starts here --
set pFolder to choose folder with multiple selections allowed
if ((count pFolder) > 1) then
set {oAStid, AppleScript's text item delimiters} to {AppleScript's text item delimiters, ""}
set pFolder to text items of pFolder
repeat with i from 1 to (count pFolder)
set (item i of pFolder) to quoted form of (POSIX path of (item i of pFolder))
end repeat
set AppleScript's text item delimiters to " "
set pFolder to pFolder as string
set AppleScript's text item delimiters to oAStid
else
set pFolder to pFolder as string
end if
try
do shell script ("pdf2ps " & pFolder)
end
-- Code ends here --