A lot of unix config files in xx.d folders are prefixed by a number, like :
$ ls /etc/grub.d/
00_header 10_linux 30_os-prober 40_custom
05_debian_theme 20_linux_xen 30_uefi-firmware 41_custom
Is there any convention on this number? What does it mean ?
Might just be to avoid name clashing but I'm curious if there's anything more.
Best Answer
It's a convention used both to keep filenames unique, and to control the order in which scripts get executed. In general, the xx.d directories are scanned by something doing the moral equivalent of
for file in /etc/grub.d/*; do ...and the numeric prefixes give this an ordering other than alphabetical. There may be application-specific standards for what's a4x_foovs a9x_foobut nothing consistent across all the xx.d directories.