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I noticed that the command line 'zip' tool and Mac OS X's 'Compress XXX' option (available via right click in finder) are giving different output files. Not only is the size of the file a few hundred bytes bigger but the content is significantly different as well.
How can I find out what command the Finder is using for compression?
607
Compressed files take up less disk space than uncompressed files, so compressing is useful for making backup copies of your data or for sending information over the internet.
Compress a file or folder: Control-click it or tap it using two fingers, then choose Compress from the shortcut menu. If you compress a single item, the compressed file has the name of the original item with the . zip extension. If you compress multiple items at once, the compressed file is called Archive.
You can use the Mac search at the top right and start typing Terminal. It will appear, click on it to open the program. Type “unzip” and a space, then drag/drop the zip file into the Terminal window. Press Enter and the zip file will be unzipped, storing all files on your computer.
The answer is in man ditto:
The command:
ditto -c -k --sequesterRsrc --keepParent src_directory archive.zip
will create a PKZip archive similarly to the Finder's Compress function-
ality.
Take a look at An AppleScript to compress a Finder selection article.
try
tell application "Finder"
set theSelection to the selection
set selectionCount to count of theSelection
if selectionCount is greater than 1 then
error "Please select only one Finder item before running this script."
else if selectionCount is less than 1 then
error "Please select one Finder item before running this script."
else
set theItem to (item 1 of theSelection) as alias
set destFolder to (container of theItem) as alias
set itemName to name of theItem
end if
end tell
do shell script ("ditto -c -k --sequesterRsrc --keepParent " & quoted form of POSIX path of theItem & space & quoted form of (POSIX path of destFolder & itemName & ".zip"))
on error theError
tell me
activate
display dialog "Error: " & theError buttons {"OK"} default button 1 with icon stop
end tell
end try
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