Question

Write shell script code that displays a list of all active processes in the system. Lift the BSD-style “only yourself” restriction. The output should show the status of the processes.

#!/bin/bash

while [[ $REPLY != x ]]; do
clear

echo -e "Launch utilities:\n 1. Process Tree\n 2. Process States\n 3. Threads\n"

read -p "Enter selection [1-3], or type x to exit: " REPLY

if [ $REPLY == 1 ]; then
   echo -e "\n"

   #identify a command that displays the tree of processes in Linux
#identify the options of the command you have found that meet the requirements described in section "Process Tree" of the description of Homework 03
#put the command here, followed by the options. For example, if the command is called displayprocesstree, and the options are -a, -b, and -c, the command would appear as follows:
# displayprocesstree -abc

read void
   clear
fi

if [ $REPLY == 2 ]; then
#identify the command that displays a list of processes on the system. identify the options of that command that can include the state of each process in the output

   read void
   clear
fi

if [ $REPLY == 3 ]; then
#display a string that asks the user to enter the pid of one of the processes
#read a pid from the user onto a variable
# display the threads created by that process

read void
clear
fi

done

Answer 1

#!/bin/bash

while [[ $REPLY != x ]]; do
clear

echo -e "Launch utilities:\n 1. Process Tree\n 2. Process States\n 3. Threads\n"

read -p "Enter selection [1-3], or type x to exit: " REPLY

if [ $REPLY == 1 ]; then
echo -e "\n"
pstree -psa $$
ps -aef --forest
read void
clear
fi

if [ $REPLY == 2 ]; then
ps u
read void
clear
fi

if [ $REPLY == 3 ]; then
read -p "Enter PID: " p_id
ps -T -p $p_id
read void
clear
fi

done

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