You should be able to do this with wildcards. The shell will expand to existing files:
convert -append 0_*jpeg 0a.jpg &&
convert -append 1_*jpeg 1a.jpg &&
convert -append 2_*jpeg 2a.jpg &&
convert -append 3_*jpeg 3a.jpg &&
convert -append 4_*jpeg 4a.jpg &&
convert -append 5_*jpeg 5a.jpg &&
convert -append 6_*...
There is a 3rd party app named PDFsam. SAM stands for split and merger. It does exactly what you're looking for and there is a free basic version. This is a newer version than I have but my version has a link near title bar that read Alternate Mix that will do what you described.
The first option, System Preferences → iCloud → Mail, controls whether the iCloud Mail account is available in the Mail app. Unchecking this option will remove the account from Mail, along with all the associated email. This won’t permanently delete the mail: it will still be accessible on iCloud.com, and in Mail if you switch the option back on.
Open your terminal and type this :
sudo plutil -replace RunAtLoad -bool false /Library/LaunchAgents/com.philandro.anydesk.Frontend.plist
Basically this will set the auto start boolean value in the *.plist file from true to false which as a result would disable the autostart function. It's practically the same thing as the above solutions but much simpler.
command+q closes safari and all tabs are "remembered" so that the next time you reopen safari, those tabs will re-appear. Of course if you close tabs or close all tabs, you can always restore those tabs as described above (under the history section on the toolbar).
I've noticed that if I close safari by using the red button on the top left, when you reopen,...
After downloading rename
brew install rename
run following command
rename -n -A Vacation- *
-A : prepend
-n : Show how the files would be renamed, but don't actually anything.
So, you should remove -n flags after looking at the result.