Hi. I would like to ask for help regarding using the while statement. Supposed we want to ask the user to keep on typing in a name of months of the year for each prompt which will then be stored in a file.
I've been trying to do this since yesterday. All I can come up with is by using the IF statement which does not keep on prompting the user.
Thanx for the help ^^
This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.
Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.
If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.
Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.
Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.
Access the answers to your technology questions today.
30-day free trial. Register in 60 seconds.
Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.
Try it out and discover for yourself.
30-day free trial. Register in 60 seconds.
Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.
The code above is slightly broken - if the input closes (ie. gets EOF), it will go into a loop.
Better to write:
echo -n "prompt:...."
while read input; do
if [ x"$input" != xexit ]; then break; fi
your code
echo -n "prompt:...."
done
If read fails, the loop will terminate because read will return a non-zero status.
The 'x's in the comparison are required to avoid the case where $input begins with '-' from confusing the test operator. The double quotes are used to avoid spaces in $input from being turned into multiple arguments.
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:
Points split fridom & pjb1008
Please leave any comments here within the next seven days.
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
liddler
EE Cleanup Volunteer
Business Accounts
Answer for Membership
by: fridomPosted on 2002-12-16 at 22:19:29ID: 7593486
Hm, is this homework? Now I did not solve it all but here's how the while look can be used.
#!/bin/bash
echo -n "Give me a month name: "
read input
while [ $input != "exit" ]
do
echo -n "you gave me : "
echo $input
echo -n "another month? (exit for end) "
read input
done
echo "Have a nice day"
Usage:
./while_loop.sh
Give me a month name: January
you gave me : January
another month? (exit for end) February
you gave me : February
another month? (exit for end) exit
Have a nice day
It's up to you to check for a valid month name and writing to a file which is easy while using echo.
Regards
Friedrich