Hello Everyone,
In this tutorial,
Let Us Shell Scripts for Linux to
Learn Shell Programming – Part II
You Can also Configure in Redhat Linux, Ubuntu,
Fedora, CentOS, LinuxMint, Oracle Linux, Cloud Linux.
Script 1: Drawing a Special Pattern
#!/bin/bash
MAX_NO=0
echo -n "Enter Number between (5 to 9) : "
read MAX_NO
if ! [ $MAX_NO -ge 5 -a $MAX_NO -le 9 ] ; then
echo "WTF... I ask to enter number between 5 and 9, Try Again“
exit 1
fi
clear
for (( i=1; i<=MAX_NO; i++ )) do for (( s=MAX_NO; s>=i; s-- ))
do
echo -n " "
done
for ((
j=1; j<=i; j++ )) do echo -n " ." done echo "" done
###### Second stage ###################### for (( i=MAX_NO; i>=1; i-- ))
do
for ((
s=i; s<=MAX_NO; s++ ))
do
echo -n " "
done
for ((
j=1; j<=i; j++ ))
do
echo
-n " ."
done
echo
""
done
echo -e "\n\n\t\t\t Whenever you need help,
cloudnetwork.in is always there"
Script 2: Creating Colorful Script
#!/bin/bash
clear
echo -e "33[1m Hello World"
# bold effect
echo -e "33[5m Blink"
# blink effect
echo -e "33[0m Hello World"
# back to normal
echo -e "33[31m Hello World“
# Red color
echo -e "33[32m Hello World"
# Green color
echo -e "33[33m Hello World"
# See remaining on screen
echo -e "33[34m Hello World"
echo -e "33[35m Hello World"
echo -e "33[36m Hello World"
echo -e -n "33[0m"
# back to normal
echo -e "33[41m Hello World"
echo -e "33[42m Hello World"
echo -e "33[43m Hello World"
echo -e "33[44m Hello World"
echo -e "33[45m Hello World"
echo -e "33[46m Hello World"
echo -e "33[0m Hello World"
Script 3: Encrypt a File/Directory
yum install pinentry-gui
apt-get install pinentry-gui
Touch Encrypt.sh
Vi Encrypt.sh
#!/bin/bash
echo "Welcome, I am ready to encrypt a
file/folder for you"
echo "currently I have a limitation, Place me to
thh same folder, where a file to be encrypted is present“
echo "Enter the Exact File Name with
extension"
read file;
gpg -c $file
echo "I have encrypted the file
successfully..."
echo "Now I will be removing the original
file"
rm -rf $file
Script 4:
Checking Server Utilization
#!/bin/bash
date;
echo
"uptime:"
uptime
echo
"Currently connected:"
w
echo
"--------------------"
echo
"Last logins:"
last -a
|head -3
echo
"--------------------"
echo
"Disk and memory usage:"
df -h |
xargs | awk '{print "Free/total disk: " $11 " / " $9}'
free -m |
xargs | awk '{print "Free/total memory: " $17 " / " $8
" MB"}'
echo
"--------------------"
start_log=`head -1 /var/log/messages |cut -c 1-12`
oom=`grep
-ci kill /var/log/messages`
echo -n
"OOM errors since $start_log :" $oom
echo
""
echo
"--------------------"
echo "Utilization and most expensive
processes:"
top -b |head
-3
echo
top -b |head
-10 |tail -4
echo
"--------------------"
echo
"Open TCP ports:"
nmap -p- -T4
127.0.0.1
echo
"--------------------"
echo
"Current connections:"
ss -s
echo
"--------------------"
echo
"processes:"
ps auxf
--width=200
echo
"--------------------"
echo
"vmstat:"
vmstat 1 5
1. ‘>‘ :
the redirection operator causes a file creation, and if it does exist, the
contents are overwritten.
2. ‘>>‘
: when you use >>, you are adding information, rather than replacing it.
3. ‘>>‘
is safe, as compared to ‘>‘
Script 5: Check Disk Space and Sends an Email Alert
MAX=95
EMAIL=USER@domain.com
PART=sda1
USE=`df -h |grep $PART | awk '{ print $5 }' | cut
-d'%' -f1`
if [ $USE -gt
$MAX ]; then
echo "Percent used: $USE" | mail -s
"Running out of disk space" $EMAIL
fi
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Thanking You
Hope U Like it........
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