Give the complete command line to show processes whose PID is 1 or parent PID is...
Give the complete command line to show processes whose PID is 1 or parent PID is 1 in Linux
Homework Answers
ps is command to list all process.
command to show process whose PID is 1 is ps -p 1 or ps --pid 1 (you can use any of these)
and command to show process whose parent PID is 1 is ps -ppid 1
I'll illustrate this for you to understand. Even if you have any doubt regarding commands you can always find this by yourself by refering help command.
refer below screenshot:
run
ps --help list
![~$ ps --help list Usage: ps [options] Selection by list: -C <command> command name -G, --Group <GID real group id or name -g,](http://img.homeworklib.com/questions/15675c10-722e-11eb-ad0d-a75c03be898a.png?x-oss-process=image/resize,w_560)
so you can see the mark result how to use process id and parent process id.
run ps --pid 1 result attached below
run ps --ppid 1, result attached below
you can always refer ps --help <simple|list|output|threads|misc|all> for more options for this command.
Hope it helps. Please give feedback, if this answer helped resolved your query.
Happy to help you. Keep learning.
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Give the complete command line to show
processes whose PID is 1 or parent PID is...
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Source code to modify: #include <stdio.h> #include <unistd.h> #include <sys/types.h> int main() { pid_t pid; /*fork...
Source code to modify:
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
int main()
{
pid_t pid;
/*fork a child process*/
pid = fork();
if (pid<0){ /*error occured*/
fprintf(stderr,"Fork failed\n");
return 1;
}
else if (pid == 0) { /*child process */
printf("I am the child %d\n",pid);
execlp("/bin/ls","ls",NULL);
}
else { /*parent process */
/*parent will wait for the child to complete*/
printf("I am the parent %d\n",pid);
wait(NULL);
printf("Child Complete\n");
}
return 0;
}
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Source code to modify:
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
int main()
{
pid_t pid;
/*fork a child process*/
pid = fork();
if (pid<0){ /*error occured*/
fprintf(stderr,"Fork failed\n");
return 1;
}
else if (pid == 0) { /*child process */
printf("I am the child %d\n",pid);
execlp("/bin/ls","ls",NULL);
}
else { /*parent process */
/*parent will wait for the child to complete*/
printf("I am the parent %d\n",pid);
wait(NULL);
printf("Child Complete\n");
}
return 0;
}
1. Write program codes for 3.21 a and...
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