I am trying to run the factorial script but it’s not working.
The code is mentioned below:
------------------------------------------------------------------
Code:
/home/gc> cat fact.sh
#!/bin/bash
# using one command line parameter
factorial=1
for (( number = 1; number <= $1 ; number++ ))
do
factorial=$[ $factorial * $number ]
done
echo The factorial of $1 is $factorial
Please use code tags for listings and program output.
---------- Post updated at 09:33 PM ---------- Previous update was at 06:32 PM ----------
Ok, I've got the reason; it's the bash shell version. I was running the script in an old bash version. I found a link where this was stated. It was mentioned that 'seq' command can be used instead but even that is not recognized on my bash.
You were really close. For arithmetic, use parentheses, not brackets:
Code:
(12:40:19\[D@DeCoBox15)
[~]$ cat fact
#!/bin/bash
# using one command line parameter
factorial=1
for (( number = 1; number <= $1 ; number++ ))
do
factorial=$(($factorial * $number))
done
echo The factorial of $1 is $factorial
(12:40:21\[D@DeCoBox15)
[~]$ bash fact 12
The factorial of 12 is 479001600
seq is not a bash feature, but an external command. Apparently, your system does not have it. Perhaps you can try jot. Alternatively, you can use a while loop:
Code:
f=1 i=1
while [ $i -le $1 ]; do
f=$((f*i))
i=$((i+1))
done
echo $f
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07-15-2010
