I find it entertaining to notice that Monolingual does *NOT* remove those extra language packages from itself -- :-P

Just making a comment here - I'm certainly not trying to put down this software! People are saying that this saves them several hundred MBs, and I pretty much can't remember the last time I had a computer with less than 250GB. So we're talking about saving around 0.25% of disk space (for people like me I suppose). The vast majority of my hard drive consumption is in media files and those can't be trimmed. Trimming code signed programs is always a bit of a risk, and there are definitely programs that can't be trimmed (and you often find that out the hard way) and you're rolling the dice with system stability (especially when upgrading the OS). The unix OS (including OS X) needs to keep about a good 5% (or more) of available disk space for virtual memory, cache files, temporary files, and other such things. If you're cutting it that close, it's time for a new hard drive. Just saying...

Wow--great; works flawlessly on Mavericks. Ingmar--thanks for all your effort!

This is a simple, understandable application that does exactly what it claims to do and does it reliably. I'm overwhelmed by multi-purpose programs that I'll never get around to figuring out how to use effectively and have bought them repeatedly before realizing they sit unopened on my hard drive waiting for some fantasy block of time to learn them... Monolingual, however, I used on the first day and have used weekly since. Routinely, it saves 100s of MBs.

Highly recommend.

Hi, two days ago i downloaded monolingual to my MAC 10.5.8 to remove the languages in order to clear up some space on my computer, the program worked perfectly except i now CANNOT access FACEBOOK or HOTMAIL ... it just does not load completely.
Please help, i've tried all the other browsers and same problem... i've also noticed every web site i open ( which by the way loads fine ) i get a drop down warning "Safari can't verify the identity of this website) i'm at my wits end please help. i MISS MY facebook!

Running MacBookPro6,2; Mac OS X Lion 10.7.4 (11E53)

(1) Must be launched from an Admin account to install the new privileged helper tool.

(2) Does not honor the "Move Language Files to Trash" preference setting.

(3) No longer capable of having individual apps dropped on it (either in the Finder or running in the Dock). Throws up a non-modal window that says: "Nothing done / Monolingual is stopping without making any changes. Your OS has not been modified. OK?" It's the whole volume or nothing.

Sadness.

Worked well for awhile but then after a few runs in a months time iTunes no longer would open and I was forced to reinstall OS X. Best advice I can give to someone using programs like this is to always back up your files!

Under Snow Leopard this version of Monolingual does something to its preferences file that causes the application to crash after a number of runs. deleting net.sourceforge.Monolingual.plist and then resetting personal preferences fixes things for awhile, until next time. I just tried locking the preferences to see if I get better mileage. Time will tell.

I incidentally deleted the english(u.s) yesterday ,and now I can't type anymore, keyboard disabled. anyway I can go through it?

Monolingual 1.3.8 will break Mail.app on Leopard and possibly other code signed applications.

I can manage to consistently break Mail.app and cause it to popup the password window. It will then never remember the password, attempt to store or attempt to retrieve it from the keychain *if the Application code signature is invalid*.

In testing I've tried removing many things from Mail.app such as language files, compressing images, removing redundant unnecessary files and stripping the redundant PowerPC binary and various other things from the bundle. None of this seems to damage Mail.app's code signature.

How do you break Mail.app you ask?

By stripping the debug symbols from Mail.app using one of many app trimming applications such as Monolingual. Since Mac OS X 10.5 Leopard introduced Code Signing and Apple Mail is code signed my guess is that because the bundle is changed and the code signature is then broken and invalid Apple Mail is then treated as an untrusted application and is refused access to the keychain by SecurityServer.

According to
http://developer.apple.com/releasenotes/Security/RN-CodeSigning/index.html
applications should trigger a popup confirmation to allow the Application to update the keychain but it appears that Mail.app does not do this and SecurityServer suppresses the dialog as the code signature is invalid.
I have filed as Apple Bug ID #5734181

Opening Console.app and checking secure.log shows many entries from SecurityServer to advise:
Feb 10 23:04:02 macbookpro com.apple.SecurityServer[20]: suppressing keychain prompt for invalidly signed client /Applications/Mail.app(7514)
Feb 10 23:04:32: --- last message repeated 16 times ---

If you are getting these messages, this wll mean you may need to restore from a backup version of Mail.app from storage, time machine or another computer. If you re-install the app from the original 10.5 Installer CD you may also need to run the 10.5.1 installer and Security Update to ensure that Mail.app is up to date.


===================================
Technical Details for strip command
===================================
/usr/bin/strip: changes being made to the file will invalidate the code signature in: /private/tmp/Mail.app/Contents/MacOS/Mail

Stripping debug symbols.

#!/bin/zsh
#This shell code sample taken from Trimmit.app
[[ -n $sym ]]&&{
# strip debug symbols. "2>&1" means error messages to the standard out.
/usr/bin/strip -Sur Contents/MacOS/*(*) 2>&1
/usr/bin/strip -Sx **/*.dylib(N) **/*.framework/**/*(*N) 2>/dev/null
echo "== Stripping debug symbols."