Process
Systemd
The first process of the system, with a process ID of 1. ps -p 1 PID TTY TIME CMD 1 ?...
File Descriptor
Basic Concepts A file descriptor (FD) is an integer identifier used to represent an open file or...
Pipe
Basic Concepts A pipe can use the output of one command as the input of the next command, repres...
LSOF
[todo]
ULIMIT
[todo]