010-160 - LPI Linux Essentials Process Management and System Monitoring Questions and Answers Flashcards
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Which command displays the process ID (PID) of a running program by its name?
Answer: pidof
The `pidof` command returns the PID(s) of a named running program, making it easy to script process management tasks.
What is the parent process of all other processes on a Linux system, typically having PID 1?
Answer: init (or systemd)
The init process (or systemd on modern systems) is the first process started by the kernel and is the ancestor of all other processes with PID 1.
Which command shows a tree view of processes illustrating parent-child relationships?
Answer: pstree
The `pstree` command displays running processes in a hierarchical tree format, clearly showing parent-child relationships between processes.
What does the `df` command report on a Linux system?
Answer: Disk filesystem space usage
The `df` (disk free) command reports the amount of used and available disk space on mounted filesystems.
Which signal sent by `kill` gracefully requests a process to terminate, allowing cleanup?
Answer: SIGTERM (15)
SIGTERM (signal 15) is the default signal sent by `kill`, asking the process to terminate gracefully and perform cleanup operations.
What command can be used to run a process that continues running even after the user logs out?
Answer: nohup
The `nohup` command runs a program immune to hangup signals, allowing it to continue running after the user's terminal session ends.