Looks to me like SfB adds the login item to each user's com.apple.loginitems.plist. At least that's what I'm finding.
@cwaldrip Try this script below. I hacked this together fairly quickly and have only given it a cursory trial run, but it does seem to do the trick.
One thing I noticed however is that the GUI is not updated after running it. Meaning it still shows up in the user's Login Items tab under their account in Users & Groups, but the entry is gone from the plist itself. And yes, I tried all kinds of things, like killall cfprefsd and such, and it had no effect on the UI. I had to do a full reboot to make it disappear. I noted that SfB did not open automatically after rebooting and logging in, so it did actually work.
#!/bin/bash
itemToRemove="Skype for Business"
function Find_Remove_loginItem ()
{
LIPlist="/Users/${i}/Library/Preferences/com.apple.loginitems.plist"
## Check to see if there is a com.apple.loginitems.plist for the user
if [ -e "$LIPlist" ]; then
## Build a list of Auto Launch entries by grabbing the Name item from each entry
ALAppsList=$(/usr/libexec/PlistBuddy -c "Print :SessionItems:CustomListItems:" "$LIPlist" | awk -F'= ' '/Name /{print $NF}')
## While looping over each entry, see if it matches the itemToRemove variable defined up above
x=0
while read ENTRY; do
if [ "$ENTRY" == "$itemToRemove" ]; then
## If a match is found, set an index variable
itemIndex="$x"
echo "Found $itemToRemove entry in plist for ${i} at index $itemIndex. Removing it..."
## Delete the entry by its index in the plist, using PlistBuddy
/usr/libexec/PlistBuddy -c "Delete :SessionItems:CustomListItems:$itemIndex" "$LIPlist"
fi
let x=$((x+1))
done < <(printf '%s
' "$ALAppsList")
fi
}
## Build a list of user accounts to check
for i in $(dscl /Local/Default -list /Users UniqueID | awk '$2 >= 100 { print $1 }' | grep -v "^_");do
## For each user, run the function to find and delete the login item
Find_Remove_loginItem
done
To try to make the script a bit flexible, you can change the itemToRemove variable to some other entry and it should work for those as well.
