I'm not getting cube of the number
while [ "$c" = y -o "$c" = Y -o -z $c ]
do
echo enter a number;
read n;
if [ $n -ge 0 -a $n -le 50 ];then
echo "cube= `expr $n * $n * $n`";
fi;
echo y to continue or any to exit;
read c;
done
shell files
edited Jan 11 at 19:52
fra-san
1,4051215
asked Jan 11 at 19:31
Parth PrajapatiParth Prajapati
111
add a comment |
while [ "$c" = y -o "$c" = Y -o -z $c ]
do
echo enter a number;
read n;
if [ $n -ge 0 -a $n -le 50 ];then
echo "cube= `expr $n * $n * $n`";
fi;
echo y to continue or any to exit;
read c;
done
shell files
edited Jan 11 at 19:52
fra-san
1,4051215
asked Jan 11 at 19:31
Parth PrajapatiParth Prajapati
111
To ask a better question, you should describe (or better, show) what actually happens, and describe how that differs from what you want to happen.
– glenn jackman
Jan 11 at 21:02
add a comment |
while [ "$c" = y -o "$c" = Y -o -z $c ]
do
echo enter a number;
read n;
if [ $n -ge 0 -a $n -le 50 ];then
echo "cube= `expr $n * $n * $n`";
fi;
echo y to continue or any to exit;
read c;
done
shell files
edited Jan 11 at 19:52
fra-san
1,4051215
asked Jan 11 at 19:31
Parth PrajapatiParth Prajapati
111
while [ "$c" = y -o "$c" = Y -o -z $c ]
do
echo enter a number;
read n;
if [ $n -ge 0 -a $n -le 50 ];then
echo "cube= `expr $n * $n * $n`";
fi;
echo y to continue or any to exit;
read c;
done
shell files
shell files
edited Jan 11 at 19:52
fra-san
1,4051215
asked Jan 11 at 19:31
Parth PrajapatiParth Prajapati
111
edited Jan 11 at 19:52
fra-san
1,4051215
asked Jan 11 at 19:31
Parth PrajapatiParth Prajapati
111
edited Jan 11 at 19:52
fra-san
1,4051215
edited Jan 11 at 19:52
fra-san
1,4051215
edited Jan 11 at 19:52
fra-san
1,4051215
1,4051215
asked Jan 11 at 19:31
Parth PrajapatiParth Prajapati
111
asked Jan 11 at 19:31
Parth PrajapatiParth Prajapati
111
asked Jan 11 at 19:31
Parth PrajapatiParth Prajapati
111
111
To ask a better question, you should describe (or better, show) what actually happens, and describe how that differs from what you want to happen.
– glenn jackman
Jan 11 at 21:02
add a comment |
To ask a better question, you should describe (or better, show) what actually happens, and describe how that differs from what you want to happen.
– glenn jackman
Jan 11 at 21:02
To ask a better question, you should describe (or better, show) what actually happens, and describe how that differs from what you want to happen.
– glenn jackman
Jan 11 at 21:02
To ask a better question, you should describe (or better, show) what actually happens, and describe how that differs from what you want to happen.
– glenn jackman
Jan 11 at 21:02
add a comment |
2 Answers
2
active
oldest
votes
You've got a few problems with your shell script. First, you should quote $c in the while (all of them — you missed the last one). Otherwise, when $c is empty (say, at the start of your program), the -z test gets passed nothing instead of the empty string, giving an error (something along the lines of "argument expected").
Second, you need to escape the * in your expr command. Otherwise it's trying to do a glob (match filenames), just like cat * would do. Easiest is to escape it to *. The error from that will depend on exactly what the * happens to expand to (i.e., which files are in your current directory), but will probably be something confusing!
That should at least get your script to run.
PS: There are a bunch more ways this could be improved, you might want to check out ShellCheck for some (automated) suggestions.
answered Jan 11 at 19:43
derobertderobert
73k8154210
add a comment |
In bash, you could write:
PS3="Continue? "
while true; do
read -p "Enter a number: " n
((0 <= n && n <= 50)) && echo "cube = $((n * n * n))"
select ans in yes no; do
case $ans in
yes) break ;;
no) break 2 ;;
esac
done
done
answered Jan 11 at 21:01
glenn jackmanglenn jackman
51.1k571110
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
You've got a few problems with your shell script. First, you should quote $c in the while (all of them — you missed the last one). Otherwise, when $c is empty (say, at the start of your program), the -z test gets passed nothing instead of the empty string, giving an error (something along the lines of "argument expected").
Second, you need to escape the * in your expr command. Otherwise it's trying to do a glob (match filenames), just like cat * would do. Easiest is to escape it to *. The error from that will depend on exactly what the * happens to expand to (i.e., which files are in your current directory), but will probably be something confusing!
That should at least get your script to run.
PS: There are a bunch more ways this could be improved, you might want to check out ShellCheck for some (automated) suggestions.
answered Jan 11 at 19:43
derobertderobert
73k8154210
add a comment |
You've got a few problems with your shell script. First, you should quote $c in the while (all of them — you missed the last one). Otherwise, when $c is empty (say, at the start of your program), the -z test gets passed nothing instead of the empty string, giving an error (something along the lines of "argument expected").
Second, you need to escape the * in your expr command. Otherwise it's trying to do a glob (match filenames), just like cat * would do. Easiest is to escape it to *. The error from that will depend on exactly what the * happens to expand to (i.e., which files are in your current directory), but will probably be something confusing!
That should at least get your script to run.
PS: There are a bunch more ways this could be improved, you might want to check out ShellCheck for some (automated) suggestions.
answered Jan 11 at 19:43
derobertderobert
73k8154210
add a comment |
You've got a few problems with your shell script. First, you should quote $c in the while (all of them — you missed the last one). Otherwise, when $c is empty (say, at the start of your program), the -z test gets passed nothing instead of the empty string, giving an error (something along the lines of "argument expected").
Second, you need to escape the * in your expr command. Otherwise it's trying to do a glob (match filenames), just like cat * would do. Easiest is to escape it to *. The error from that will depend on exactly what the * happens to expand to (i.e., which files are in your current directory), but will probably be something confusing!
That should at least get your script to run.
PS: There are a bunch more ways this could be improved, you might want to check out ShellCheck for some (automated) suggestions.
answered Jan 11 at 19:43
derobertderobert
73k8154210
You've got a few problems with your shell script. First, you should quote $c in the while (all of them — you missed the last one). Otherwise, when $c is empty (say, at the start of your program), the -z test gets passed nothing instead of the empty string, giving an error (something along the lines of "argument expected").
Second, you need to escape the * in your expr command. Otherwise it's trying to do a glob (match filenames), just like cat * would do. Easiest is to escape it to *. The error from that will depend on exactly what the * happens to expand to (i.e., which files are in your current directory), but will probably be something confusing!
That should at least get your script to run.
PS: There are a bunch more ways this could be improved, you might want to check out ShellCheck for some (automated) suggestions.
answered Jan 11 at 19:43
derobertderobert
73k8154210
answered Jan 11 at 19:43
derobertderobert
73k8154210
answered Jan 11 at 19:43
derobertderobert
73k8154210
answered Jan 11 at 19:43
derobertderobert
73k8154210
73k8154210
add a comment |
add a comment |
In bash, you could write:
PS3="Continue? "
while true; do
read -p "Enter a number: " n
((0 <= n && n <= 50)) && echo "cube = $((n * n * n))"
select ans in yes no; do
case $ans in
yes) break ;;
no) break 2 ;;
esac
done
done
answered Jan 11 at 21:01
glenn jackmanglenn jackman
51.1k571110
add a comment |
In bash, you could write:
PS3="Continue? "
while true; do
read -p "Enter a number: " n
((0 <= n && n <= 50)) && echo "cube = $((n * n * n))"
select ans in yes no; do
case $ans in
yes) break ;;
no) break 2 ;;
esac
done
done
answered Jan 11 at 21:01
glenn jackmanglenn jackman
51.1k571110
add a comment |
In bash, you could write:
PS3="Continue? "
while true; do
read -p "Enter a number: " n
((0 <= n && n <= 50)) && echo "cube = $((n * n * n))"
select ans in yes no; do
case $ans in
yes) break ;;
no) break 2 ;;
esac
done
done
answered Jan 11 at 21:01
glenn jackmanglenn jackman
51.1k571110
In bash, you could write:
PS3="Continue? "
while true; do
read -p "Enter a number: " n
((0 <= n && n <= 50)) && echo "cube = $((n * n * n))"
select ans in yes no; do
case $ans in
yes) break ;;
no) break 2 ;;
esac
done
done
answered Jan 11 at 21:01
glenn jackmanglenn jackman
51.1k571110
answered Jan 11 at 21:01
glenn jackmanglenn jackman
51.1k571110
answered Jan 11 at 21:01
glenn jackmanglenn jackman
51.1k571110
answered Jan 11 at 21:01
glenn jackmanglenn jackman
51.1k571110
51.1k571110
add a comment |
add a comment |
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To ask a better question, you should describe (or better, show) what actually happens, and describe how that differs from what you want to happen.
– glenn jackman
Jan 11 at 21:02