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Bourne shell programming

Posted on 2002-07-24
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Last Modified: 2013-12-26
I'm writing a Bourne shell script. It calculates a factorial of an integer (n).

#!/bin/sh
echo "n = \c"
read n
total = 1
i     = 1
while [ "$i" -le "$n" ]
do
  total = `expr $total * $i`
  i     = `expr $i + 1`
done
echo "$n factorial = $total"

When I ran it, I had the following errors:

i not found
total not found

Could somebody point out the errors in the script for me ?

Thanks.
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Question by:kevinnguyen
5 Comments
 
LVL 85

Accepted Solution

by:
ozo earned 260 total points
ID: 7175523
#!/bin/sh
echo "n = \c"
read n
total=1
i=1
while [ "$i" -le "$n" ]
do
    total=`expr $total \* $i`
    i=`expr $i + 1`
done
echo "$n factorial = $total"
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LVL 51

Expert Comment

by:ahoffmann
ID: 7175788
previous suggestion in words: remove blanks arround =
0
 

Expert Comment

by:rajiv_indya
ID: 7176358
#!/bin/sh
echo "n = \c"
read n
total=1
i=1
echo $total
echo $i
while [ "$i" -le "$n" ]
do
 total=`expr $total \* $i`
 i=`expr $i \+ 1`
done
echo "$n factorial = $total"



This I have tested is working
Problem in Shell Scripting spaces does matter , donot give unnecessary spaces or tabs in between . Also * is the special character having special meaning of all files so use \ along with it to hide its special meaning.

I think this is what u wanted
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Expert Comment

by:tfewster
ID: 8020809
No comment has been added lately, so it's time to clean up this Topic Area.
I will leave a recommendation for this question in the Cleanup topic area as follows:

- Answered by ozo

Please leave any comments here within the next 7 days

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER !

tfewster
Cleanup Volunteer
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Expert Comment

by:SpideyMod
ID: 8066963
per recommendation

SpideyMod
Community Support Moderator @Experts Exchange
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