Challenge_07

1. List all running processes.
   Check if a process named bash is running (using 2 different commands)
Sol.
ps -ef 
ps -ef | grep bash
OR
psgrep  -l bash


2. Using the ps command list all processes sorted by memory in reverse order.
   Redirect the output to a file called processes.txt
Sol.
ps -aux --sort=-%mem > processes.txt


3. Show the real time view of the processes running for user1 and highlight the processes and the sorting column.
Sol.
top
Press u and then user1
Press y => HIghlighting the running process
Press x => Highlighting the sorting column.


4. Send the terminate signal to the current terminal
Sol. 
ps -ef | grep term
kill 1918


5. Start a graphical application like Firefox and send the interupt signal to it.
   Restart Firefox and open another tab in a new window. Now close all the running instances of Firefox
Sol.
kill -SIGINT $(pidof firefox)
------------------------------------
pkill -15 firefox


6. Run the command "ls -lR /" in the foreground, pause the process and resume it
Sol. 
ls -lR /
CTRL+Z
jobs
fg %2


7. Run sleep 100 in the background. Close the terminal, open it again and check if the process is still running. If it’s not running, run sleep 100 again 
   making it immune to the closing terminal.
Sol.
sleep 100 &
pgrep -l sleep
nohup sleep 200 &
pgrep -l sleep