2

There is a lot of stuff that is configured using directories in /etc with .d suffix, which stands for "directory" and even though Unix doesn't require such suffix, it is used to avoid name clashing.

It's hard to google it. I wanted to disable one of the scripts in /etc/update-motd.d/ and could not do it. How to disable a script in such .d directory?

3

It depends a lot on the directory and distro in question. For example:

  • update-motd.d scripts in Ubuntu have to be executable, as the update-motd manpage says:

    Executable  scripts in /etc/update-motd.d/* are executed by pam_motd(8)
    
  • Files in profile.d in Ubuntu should have the a .sh extension, since /etc/profile contains:

    if [ -d /etc/profile.d ]; then
      for i in /etc/profile.d/*.sh; do
        if [ -r $i ]; then
          . $i
    
  • Files in sudoers.d shouldn't have extensions, or end with ~:

     ...  For example, given:
    
         #includedir /etc/sudoers.d
    
     sudo will read each file in /etc/sudoers.d, skipping file names that end
     in ‘~’ or contain a ‘.’ 
    

And so on.


All three points also probably apply to Debian.

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