Manual page for systemd.service unit configurations. A unit configuration file whose name ends with ".service" stores information about the process controlled and monitored by systemd.

The unlink Linux command manual page and help. The unlink command deletes the specified file or symbolic link.

The manual page for the systemd-sysv-generator Linux command. 

The manual page and help for the more Linux command. more is a filter program, it shows only one screen of a given text. This is a very simple version. less is a more emulation with many new and useful features.

The manual page and help for the less Linux command. The less command is a text file display tool that can be used to view large text files in terminals with scrolling options.

The manual page and help for the ldd Linux command. The ldd command lists the shared directories used by the program.

The manual page and help for the aplay /arecord Linux command. The aplay/arecord command is a command-line player and audio recording tool for the ALSA sound card driver.

The manual page and help for the daemon Linux command. The daemon command turns other processes into daemons. 

The readlink Linux command manual page and help. The readlink command lists the contents of symbolic links.

The socket Linux interface manual page. BSD-compliant sockets provide a unified interface between the user process and the kernel's network protocol stacks.