Linux Processes and Controlling Them
The Linux
Command Line
Chapter 10
Processes
Prepared by Dr. Reyes, New York City College of Technology
Processes
•
When the system starts, the kernel executes the
init
program
•
init
runs several shell scripts that start the services
•
When a program launch another program, these
are know as
parent
process
and
child
process
respectively.
•
Each process is assigned a process ID (PID)
Processes Commands
•
ps
– command used to view a snapshot of the
processes
•
top
– command used to view process dynamically
Processes Commands
•
&
- used after the process name to send it to the
background
•
jobs
– command used to list the jobs that have
been launched from our terminal.
Processes Commands
•
fg
– command used to return a process to the
foreground
•
To terminate a process use
Ctrl+C
•
To stop a process without terminating it use
Ctrl+Z
Processes Commands
•
kill
– command used to kill a process
•
killall
– command used to send signals to multiple
processes matching a specified program or
username
Controlling a Process
Practice
•
Execute the following commands
o
xlogo
o
Ctrl + C
o
xlogo &
o
ps
o
jobs
o
fg %1
o
Ctrl + Z
o
ps (Check the PID of xlogo)
o
kill PID (where PID is the Process ID of xlogo)
o
xlogo &
o
xlogo &
o
kiallall xlogo
This content provides insights into Linux processes, including parent-child relationships, process management commands like ps and top, background jobs, bringing processes to the foreground, and terminating processes. It also covers killing processes using kill and killall commands.
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Presentation Transcript
The Linux Command Line Chapter 10 Processes Prepared by Dr. Reyes, New York City College of Technology
Processes When the system starts, the kernel executes the init program init runs several shell scripts that start the services When a program launch another program, these are know as parent process and child process respectively. Each process is assigned a process ID (PID)
Processes Commands ps command used to view a snapshot of the processes top command used to view process dynamically
Processes Commands & - used after the process name to send it to the background jobs command used to list the jobs that have been launched from our terminal.
Processes Commands fg command used to return a process to the foreground To terminate a process use Ctrl+C To stop a process without terminating it use Ctrl+Z
Processes Commands kill command used to kill a process killall command used to send signals to multiple processes matching a specified program or username
Controlling a Process Practice Execute the following commands o xlogo o Ctrl + C o xlogo & o ps o jobs o fg %1 o Ctrl + Z o ps (Check the PID of xlogo) o kill PID (where PID is the Process ID of xlogo) o xlogo & o xlogo & o kiallall xlogo
