UNIX for Dummies Questions & Answers

Dear Group..
I am very new user of Linux..
Can any of you help me to complete my script.?
I have two commands
$DISPLAY - will give o/p as ARUN:00.0
and hostname - will give o/p as ARUN

I need to get from $DISPLAY as ARUN(trim after
if the $DISPLAY fails to return, get o/p from hostname(no need to trim)
my concept is
X = $DISPLAY
IF(trim(X,":")=="") then
echo hostname
else
echo trim(X,":")
end;

You can use the following in BASH

Code:

DISPLAY=` echo "Arun:0:0"`
X=` echo $DISPLAY | cut -d":" -f1`
if [ $X == "" ]
then
echo hostname
else
echo $X
fi

Thanks Rahul..
That's really work.

echo $DISPLAY is command to find the hostname in dump terminal.
I have modified your coding as follows..

X= echo $DISPLAY | cut -d":" -f1
if [ $X == `` ]
then
hostname
else
echo $X
fi


but it gives o/p as two strings(hostname and $DISPLAY ). I need any one. What should I change in the code?

Any body..? Can solve this?

You have dropped the backticks which is very necessary. Use this.

Code:

X=$(echo $DISPLAY | cut -d":" -f1)
if [ "_$X" == "_" ]
then
	hostname 
else
	echo "$X"
fi

Thanks Vino...