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1. Buka Mozilla Firefox.
2. Klik menu Tool – Add-ons

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Bash script berikut akan menampilkan total memori yang digunakan dan yang tidak digunakan.
Buat file menggunakan editor dan simpan dengan nama mem.sh
Berikut source code-nya:

#! /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";
}'

Jalankan file : ./mem.sh

$ ./mem.sh
Memory Space Details
Total Memory space : 1000 MB
Used Memory Space : 31 MB
Free Memory : 968 MB
Swap memory Details
Total Swap space : 0 MB
Used Swap Space : 0 MB
Free Swap : 0 MB

Bash script ini berfungsi untuk menampilkan sedikit informasi mengenai user-user yang baru saja login dan apa yang mereka lakukan.
Source code : 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

Jalankan : ./loggedin.sh

Total number of unique users logged in currently
1

List of unique users logged in currently
tux-kecil

The user who is using high %cpu
0.00s tux-kecil    ttyp1    118.96.149.36    05:38    0.00s  0.08s  0.00s /bin/bash ./log

List of users logged in and what they are doing
 09:21:19 up 2 days, 23:37,  1 user,  load average: 0.00, 0.00, 0.00
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
tux-kecil    ttyp1    118.96.149.36    05:38    0.00s  0.08s  0.00s /bin/bash ./log

Bash scripts berikut digunakan untuk mengetahui daftar proses dalam CPU dan penggunaan memori

$ pico processes.sh
#! /bin/bash

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

Sebelum menjalankan scripts tersebut, patikan Anda mempunyai hak akses exceute (chmod +x). Cara menjalankan script tersebut sebagai berikut:
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