Shell Scripts for Linux Newbies to Learn Shell Programming – Part II - Cloud Network

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    Thursday, March 5, 2015

    Home Redhat Linux Ubuntu Shell Scripts for Linux Newbies to Learn Shell Programming – Part II

    Shell Scripts for Linux Newbies to Learn Shell Programming – Part II



    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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