What’s the difference between ‘hier(7)’ and ‘file-hierarchy(7)’ man pages?

Both hier(7) and file-hierarchy(7) man pages claim to describe the conventional file system hierarchy. However, there are some differences between them. For example, hier(7) describes /opt and /var/crash, but file-hierarchy(7) does not. What are the differences between these two descriptions. Which one do real Linux systems use?

Stop systemd service before suspend, start again after resume

What I want I have a systemd service that I would like to have stopped before suspend/shutdown, and start up again after resume. System details System details below. $ lsb_release -dc Description: Ubuntu 20.04.1 LTS Codename: focal $ systemd –version systemd 245 (245.4-4ubuntu3.3) +PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL … Read more