Basic shell scripting.......

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Variables:
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variable="value"

variable=`unix command`

index=1

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Incrementing a numeric variable:
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index++

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Arrays:
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variable[1]="value"
variable[2]=`unix command`

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Print to console:
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echo "Prining my first line.."
echo $variableName

echo ${variable[${index}]}


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Generating a unique Nubmer/Name:
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date +%Y%m%d%H%M



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IF Block
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if [ condition ] ; then
    ## Case 1
else
    ## Case 2
fi


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Check for successful execution of a command:
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NOW=`date `
if [ $? -ne 0 ] ; then
echo "Errors"
else
echo "Success"
fi
echo $NOW

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FOR Block:
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for <variable> in <array/variable> ; do
    ## commands

done

Example:

file_list=`ls -N *.log`
for file_name in $file_list ; do
    rm -f $file_name
done

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While Block:
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while [ condition ]
do
   
done

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Command to find and replace a string
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DT=`date | awk '{print $6}'`
NEWDT=`expr $DT + 1`
NEWDT2=`expr $DT + 2`

sed -i "s/$DT/$NEWDT/g" */*.xml
sed -i "s/validUntil=\"$DT/validUntil=\"$NEWDT/g" */*.xml

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Shell script method & arguments
==============================================================================
printData(){
    param=1
    echo $param
}
printData("Unix session is gona end shortly...");


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Passing on Arguments to a shell script:
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echo $1 ## put this any where in the script
echo $2 ## keep increasing the number to get more arguments