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Shell Programming and Scripting

Error to Read Input from command line

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Top Forums Shell Programming and Scripting Error to Read Input from command line
# 1  
Old 07-01-2014
Error to Read Input from command line
Team ,
I am trying to write a case condition for database backups.But I am unable to make the script to read input from command line .
Code:
 
 
while true ;do
 read -p "Do You Wish To Take Database Backup ?? " yn
  case $yn in
 [Yy]*) echo " YES take backup ";;
        [Nn]*) echo " NO BACKUP " ;;
         *) echo "Please Answer Yes OR NO " ;;
esac
done

I am getting below error after executing .


Code:
 
read: 0403-039 No query process for pipe.

Why this error pop up ?
# 2  
Old 07-01-2014
You are probably executing it with the wrong shell. Are you using ksh93 ? In ksh93 -p is used to read output from a coprocess, whereas bash uses the -p option for a prompt.
# 3  
Old 07-01-2014
Code:
echo $SHELL

should give you then name of your shell.
# 4  
Old 07-01-2014
What shell are you in? For me, I'm usually Korn shell, ksh so I would craft is like this:-
Code:
while true ;do
 read yn?"Do You Wish To Take Database Backup ?? "
 case $yn in
   [Yy]*) echo " YES take backup "        ;;
   [Nn]*) echo " NO BACKUP "              ;;
       *) echo "Please Answer Yes OR NO " ;;
 esac
done

I hope that this helps,


Robin
# 5  
Old 07-01-2014
Thanks for your replies this is ksh .Batte I used your sytax .


Code:
 
while true ;do
        
read  yn? "Do You Wish To Take Database Backup for $DB?? " 
 case $yn in
 [Yy]*) echo " YES take backup ";;
        [Nn]*) echo " NO BACKUP " ;;
         *) echo "Please Answer Yes OR NO " ;;
esac
done

I don't see its running fine .I can see more errors though its taking inputs from command line .May be i should add break in each choice to come out of the loop ?


Code:
 
./Config.sh[56]: Do You Wish To Take Database Backup for ?? : This is not an identifier.
Please Answer Yes OR NO
y
./Config.sh[56]: Do You Wish To Take Database Backup ?? : This is not an identifier.
 YES take backup
./Config.sh[56]: Do You Wish To Take Database Backup ??  : This is not an identifier.
Please Answer Yes OR NO
n
./Config.sh[56]: Do You Wish To Take Database Backup ??   : This is not an identifier.
 NO BACKUP
./Config.sh[56]: Do You Wish To Take Database Backup ??  : This is not an identifier.
Please Answer Yes OR NO
cancel
./Config.sh[56]: Do You Wish To Take Database Backup for ?? : This is not an identifier.
Please Answer Yes OR NO

# 6  
Old 07-01-2014
You have a space in your read command between the yn? and the quoted prompt. Take this out. I get the following output to the code as posted:-
Code:
Do You Wish To Take Database Backup ?? y
 YES take backup 
Do You Wish To Take Database Backup ?? n
 NO BACKUP 
Do You Wish To Take Database Backup ?? rubbish 
Please Answer Yes OR NO 
Do You Wish To Take Database Backup ??

... and then I cancelled with Cntl-C

Perhaps also use double quotes in the case statement like this to cater for someone just pressing ENTER:-
Code:
case "$yn" in



Robin
# 7  
Old 07-01-2014
Just trying to add the case condition to a for loop where for have n number iterations.but after giving choice as N its completly coming out of for loop
not iterating for other DB values in for loop .am i missing something ? Before adding CASE conditition for loop was iterating for n number values


Code:
 
for DB in ${DATABASES}
do
 doing some thing for n number of dbs... 
while true ;do        
read yn?"Do You Wish To Take Database Backup for $DB?? " 
 case "$yn" in
 [Yy]*) echo " YES take backup ";
        break ;;
        [Nn]*) exit;;
         *)    echo "Please Answer Yes OR NO " ;;
esac
done
done

Out is below

Code:
 
Do You Wish To Take Database Backup for ? n

Last edited by rocking77; 07-01-2014 at 09:58 AM..
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