if statement in a while loop

bobo · #1 (**permalink**) 11-07-2006

#!/usr/bin/ksh
echo Please enter
while read n
do
echo $n >> datafile
done

question:

How can I enject an if statement that if the users enter 0 (zero) the program will exit?

this is what I have but not working

#!/usr/bin/ksh
echo Please enter number
while read n
do
if $n=0
then
exit
else
echo $n >> datafile
fi
done

Thanks!

tmarikle · #2 (**permalink**) 11-07-2006

Read up on the test command (man test)

Code:

if [[ $n -eq 0 ]]
then
    exit
fi

BOFH · #3 (**permalink**) 11-07-2006

You have to use the test construct in the if statement:

Code:

#!/usr/bin/ksh

echo Please enter number

while read n
do
  if [ $n=0 ]
  then
    exit
  else
    echo $n >> datafile
  fi
done

More UNIX and Linux Forum Topics You Might Find Helpful
Thread	Thread Starter	Forum	Replies	Last Post
If statement - How to write a null statement	april	Shell Programming and Scripting	3	04-16-2008 01:14 PM
while read loop w/ a nested if statement - doesn't treat each entry individually	littlefrog	Shell Programming and Scripting	7	12-11-2007 09:49 PM
For loop statement - catch error	lumdev	Shell Programming and Scripting	4	09-20-2007 07:50 AM
if statement in for loop of a string	Sniper Pixie	UNIX for Dummies Questions & Answers	7	03-02-2006 07:28 AM
how to get the similar function in while loop or for loop	trynew	Shell Programming and Scripting	3	06-17-2002 11:09 AM

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode	Rate This Thread:


	Powered by