Форматы файлов и условные обозначения

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    Name    |  Synopsis  |  Description  |  Implicit dependencies  |  Paths  |  User/group identity  |  Capabilities  |  Security  |  Mandatory access control  |  Process properties  |  Scheduling  |  Sandboxing  |  System call filtering  |  Environment  |  Logging and standard input/output  |  Credentials  |  System v compatibility  |  Environment variables in spawned processes  |  Process exit codes  |  See also  |  Note  |

systemd.exec - Execution environment configuration

Исходный текст на man7.org