Small shell script help required

Shell Programming and Scripting
1

Hi Guys,

Please can some one explain me the below part of code. In this code what is the use of the line in Bold.

COPY=0

if [ -s $CONF ]; then
echo "$CONF exists and is non-empty - backing it up"
SUFFIX=`date +%Y%m%d%H%M%S`
echo "cp -p $CONF $CONF.$SUFFIX"
cp -p $CONF $CONF.$SUFFIX
[ $CLOBBER -ne 0 ] && COPY=1
else
COPY=1
fi

Regards,
Abhishek

2

It means 'if the variable CLOBBER is not zero then set COPY=1'

3

Ok Thanks for the help....

Regards,
Abhi

4

you better read what && means
Operators
also read this
Test Constructs

5

One more query......

I am trying to assign a value to a variable but getting error....

IP_ADDR=${`grep 'I.P. Address' /install/cfgdist/`uname -n`.cfg | cut -d : -f 2| cut -d . -f 1-3| sed s/" "//g`}

I am using this script to grep first three octets of an IP address from a file and assign the value to IP_ADDR....but I am not able to assign the value to the variable...

Please some one help.

Regards,
Abhishek