The fundamental way of controlling processes in Linux is by sending signals to them. There are multiple signals that you can send to a process, to view all the signals run:
The fundamental way of controlling processes in Linux is by sending signals to them. There are multiple signals that you can send to a process, to view all the signals run:
Chapter11: Compression, System Backup, And Software Installation
Section: Chapter Questions
Problem 5DE
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![Sending Signals to Processes
The fundamental way of controlling processes in Linux is by sending signals to them. There
are multiple signals that you can send to a process, to view all the signals run:
$ kill -1
[root@tecmint ~]# kill -
1) SIGHUP
6) SIGABRT
11) SIGSEGV
16) SIGSTKFLT
21) SIGTTIN
26) SIGVTALRM
2) SIGINT
7) SIGBUS
12) SIGUSR2
17) SIGCHLD
22) SIGTTOU
27) SIGPROF
34) SIGRTMIN
3) SIGQUIT
8) SIGFPE
13) SIGPIPE
18) SIGCONT
23) SIGURG
28) SIGWINCH
35) SIGRTMIN+1
4) SIGILL
9) SIGKILL
14) SIGALRM
19) SIGSTOP
24) SIGXCPU
29) SIGIO
30) SIGPWR
31) SIGSYS
36) SIGRTMIN+2 37) SIGRTMIN+3
38) SIGRTMIN+4 39) SIGRTMIN+5 40) SIGRTMIN+6 41) SIGRTMIN+7 42) SIGRTMIN+8
43) SIGRTMIN+9 44) SIGRTMIN+10 45) SIGRTMIN+11 46) SIGRTMIN+12 47) SIGRTMIN+13
48) SIGRTMIN+14 49) SIGRTMIN+15 50) SIGRTMAX-14 51) SIGRTMAX-13 52) SIGRTMAX-12
53) SIGRTMAX-11 54) SIGRTMAX-10 55) SIGRTMAX-9 56) SIGRTMAX-8 57) SIGRTMAX-7
58) SIGRTMAX-6
63) SIGRTMAX-1 64) SIGRTMAX
[root@tecmint ~]#
59) SIGRTMAX-5 60) SIGRTMAX-4 61) SIGRTMAX-3 62) SIGRTMAX-2
kill a process, using the command
kill processid
freeze a process, using command
Kill-STOP processid
Unfreeze a process, using command
Kill-CONT processid
Screenshot for each command.
5) SIGTRAP
10) SIGUSR1
15) SIGTERM
20) SIGTSTP
25) SIGXFSZ](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4beb3cfe-e017-4d23-ae7c-5be399d5ac3a%2F8662c303-eca4-492f-b719-35d180078538%2Fhg7i35_processed.png&w=3840&q=75)
Transcribed Image Text:Sending Signals to Processes
The fundamental way of controlling processes in Linux is by sending signals to them. There
are multiple signals that you can send to a process, to view all the signals run:
$ kill -1
[root@tecmint ~]# kill -
1) SIGHUP
6) SIGABRT
11) SIGSEGV
16) SIGSTKFLT
21) SIGTTIN
26) SIGVTALRM
2) SIGINT
7) SIGBUS
12) SIGUSR2
17) SIGCHLD
22) SIGTTOU
27) SIGPROF
34) SIGRTMIN
3) SIGQUIT
8) SIGFPE
13) SIGPIPE
18) SIGCONT
23) SIGURG
28) SIGWINCH
35) SIGRTMIN+1
4) SIGILL
9) SIGKILL
14) SIGALRM
19) SIGSTOP
24) SIGXCPU
29) SIGIO
30) SIGPWR
31) SIGSYS
36) SIGRTMIN+2 37) SIGRTMIN+3
38) SIGRTMIN+4 39) SIGRTMIN+5 40) SIGRTMIN+6 41) SIGRTMIN+7 42) SIGRTMIN+8
43) SIGRTMIN+9 44) SIGRTMIN+10 45) SIGRTMIN+11 46) SIGRTMIN+12 47) SIGRTMIN+13
48) SIGRTMIN+14 49) SIGRTMIN+15 50) SIGRTMAX-14 51) SIGRTMAX-13 52) SIGRTMAX-12
53) SIGRTMAX-11 54) SIGRTMAX-10 55) SIGRTMAX-9 56) SIGRTMAX-8 57) SIGRTMAX-7
58) SIGRTMAX-6
63) SIGRTMAX-1 64) SIGRTMAX
[root@tecmint ~]#
59) SIGRTMAX-5 60) SIGRTMAX-4 61) SIGRTMAX-3 62) SIGRTMAX-2
kill a process, using the command
kill processid
freeze a process, using command
Kill-STOP processid
Unfreeze a process, using command
Kill-CONT processid
Screenshot for each command.
5) SIGTRAP
10) SIGUSR1
15) SIGTERM
20) SIGTSTP
25) SIGXFSZ
Transcribed Image Text:Name of Experiment: Handling groups in Linux
EXPERIMENT NO:4
Goal: Interaction with Processes.
Theory: It's important to know which processes are running and how to manage them. You
will notice that sometimes a task or process will freeze, how useful is it to have the power to
reboot or stop the said process. By the end of this tutorial, you will be familiar with how to
manage process.
Software Tools: Ubuntu, Virtual Box.
Procedure:
A process refers to a program in execution; it's a running instance of a program.
Foreground processes (also referred to as interactive processes) - are processes which aren't
started automatically as part of the system. In other words, there has to be a user connected to
the system to start the process.
Background processes (also referred to as non-interactive/automatic processes) - are
processes not connected to a terminal; they don't expect any user input.
Parent processes - these are processes that create other processes during run-time.
Child processes - these processes are created by other processes during run-time.
Linux Background Jobs
To start a process in the background (non-interactive), use the & symbol, here, the process
doesn't read input from a user until it's moved to the foreground. Example: brave-browser &
.
.
List the background processes, the command is bg. (Screenshot)
List of processes running in the background, type the commands jobs" (Screenshot)
Send a background process to the foreground, use the fg command together with the
job ID_(screenshot)
View Active Processes in Linux (screenshot)
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