User Activity, View Processes, Display Memory

1. List Processes based on %CPU and Memory Usage

This script list the processes based on %CPU and Memory usage, with out argument (by default), If you specify the argument (cpu or mem), it lists the processes based on CPU usage or memory usage.

$ vi processes.sh
#! /bin/bash
#List processes based on %cpu and memory usage

echo "Start Time" `date`
# By default, it display the list of processes based on the cpu and memory usage #
if [ $# -eq 0 ]
then

 echo "List of processes based on the %cpu Usage"
 ps -e -o pcpu,cpu,nice,state,cputime,args --sort pcpu  # sorted based on %cpu
 echo "List of processes based on the memory Usage"
 ps -e -orss=,args= | sort -b -k1,1n # sorted bases rss value

# If arguements are given (mem/cpu)
else
 case "$1" in
 mem)
  echo "List of processes based on the memory Usage"
   ps -e -orss=,args= | sort -b -k1,1n
  ;;
  cpu)
  echo "List of processes based on the %cpu Usage"
  ps -e -o pcpu,cpu,nice,state,cputime,args --sort pcpu
  ;;
  *)
  echo "Invalid Argument Given \n"
  echo "Usage : $0 mem/cpu"
  exit 1
  esac 

fi
echo "End Time" `date`
exit 0

#chmod +x processes.sh

You can execute the above script as shown below.

$ processes.sh

$ processes.sh mem

$ processes.sh cpu

2. Display Logged in users and who is using high CPU percentage

This script displays few information about the currently logged in users and what they are doing.

$ vi loggedin.sh
#! /bin/bash

w > /tmp/a

echo "Total number of unique users logged in currently"
cat /tmp/a|  sed '1,2d' | awk '{print $1}' | uniq | wc -l
echo ""

echo "List of unique users logged in currently"
cat /tmp/a | sed '1,2d'|  awk '{print $1}' | uniq
echo ""

echo "The user who is using high %cpu"
cat /tmp/a | sed '1,2d' | awk   '$7 > maxuid { maxuid=$7; maxline=$0 }; END { print maxuid, maxline }' 

echo ""
echo "List of users logged in and what they are doing"
cat /tmp/a

 # chmod +x loggedin.sh

 ./loggedin.sh 
Total number of unique users logged in currently
1

List of unique users logged in currently
root

The user who is using high %cpu
0.12s root     pts/0    99.33.7.252      Sat00   16:30m  0.12s  0.12s -bash

List of users logged in and what they are doing
 04:36:49 up 2 days, 20:12,  2 users,  load average: 0.11, 0.05, 0.01
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
root     pts/0    99.33.7.252      Sat00   16:30m  0.12s  0.12s -bash
root     pts/1    122.181.129.226  04:17    0.00s  0.02s  0.00s /bin/bash ./log

3. Display Total, Used and Free Memory

The following script displays the total, used and free memory space.

$ vi mem.sh
#! /bin/bash

# Total memory space details

echo "Memory Space Details"
free -t -m | grep "Total" | awk '{ print "Total Memory space : "$2 " MB";
print "Used Memory Space : "$3" MB";
print "Free Memory : "$4" MB";
}'

echo "Swap memory Details"
free -t -m | grep "Swap" | awk '{ print "Total Swap space : "$2 " MB";
print "Used Swap Space : "$3" MB";
print "Free Swap : "$4" MB";
}'

#chmod +x mem.sh
[root@ip-10-202-215-149 ~]# ./mem.sh
Memory Space Details
Total Memory space : 2602 MB
Used Memory Space : 804 MB
Free Memory : 1797 MB
Swap memory Details
Total Swap space : 895 MB
Used Swap Space : 0 MB
Free Swap : 895 MB
[root@ip-10-202-215-149 ~]#