A program is a file stored on disk. When it's loaded into memory it it given some memory and a PID number and becomes a process. Processes are managed in a hierarchical way in that each process has a parent and possibly a child process.
- [Instructor] A program is an executable file…that is stored on disk.…A program is a passive entity until it is launched,…at which time it becomes a process.…This makes a process a running instance of a program.…When a process is created by running a program,…it's allocated some system resources…including memory and a process ID number, or PID.…Every process has a unique ID number.…Each process has a parent process that started it.…This parent process also has a process ID number.…
A process can spawn other processes called child processes.…The process ID number is used by the kernel…to manage and control the process during its lifetime.…System administrators use the process ID…for changing task priority and ending tasks.…Processes are organized in a hierarchical manner,…just like files and folders.…So the child processes are nested…under the parent processes, and so on.…When a process ends,…it is reported back to the parent process.…Its resources are freed,…and the process ID is removed.…
- Write the command that will take you to the most recent directory.
- Write the command that brings back the arguments and options from the previous line.
- Explain what extended globs can do.
- Identify the access.conf line that will restrict all users from using the cron service except for the user named bob.
- List the line that will get a list of only running services.
- Identify what typing ‘systemctl enable crond’ will do.
Skill Level Intermediate
Linux: User and Group Managementwith Grant McWilliams1h 8m Intermediate
1. Linux Shells Overview
2. Using the Bash Shell
3. Linux Processes
4. Job Scheduling
5. System Services
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