topic Re: Another Newbie Question 'For Syntax' in Operating System - HP-UX

Another Newbie Question 'For Syntax'

Scott Frye_1 — Tue, 07 Sep 2004 14:43:22 GMT

If I were writing this in C I would write:
For($i=0; $i<$total; $i+9) {
whatever I want to do
}

Does Posix have a similar syntax to do this? I've looked in the sh-posix man pages and haven't come up with this type of loop. Can anyone help me again?

Thanks

Scott

Re: Another Newbie Question 'For Syntax'

Sundar_7 — Tue, 07 Sep 2004 14:46:35 GMT

You will have to try something like this with while

typeset -i COUNT=0
MAX=10

while [[ $COUNT -lt $MAX ]]
do

(( COUNT=COUNT+1 ))
done

Re: Another Newbie Question 'For Syntax'

Scott Frye_1 — Wed, 08 Sep 2004 08:39:31 GMT

Wasn't what I was looking for but it worked like a charm. Thank you for your input.

Re: Another Newbie Question 'For Syntax'

Muthukumar_5 — Wed, 08 Sep 2004 12:05:04 GMT

You can use until format for this too as,

i=0
total=10

until [[ $i -gt $total ]]
do

echo $i

# loop increment
let i=i+1
done

Re: Another Newbie Question 'For Syntax'

Sundar_7 — Wed, 08 Sep 2004 12:21:04 GMT

Scott,

This may not be what you are looking for. But as far as I know, there is no loop construct like that in Posix.

FOR loop in posix will only accept list of values, not the range of values.

You can try something like this

for I in 0 1 2 3 4 5 6 7 8 9

But clearly, it is not an elegant or effective way of scripting.

-- Sundar.

Re: Another Newbie Question 'For Syntax'

Muthukumar_5 — Wed, 08 Sep 2004 23:57:24 GMT

We can use awk programming to use exact format of c as,

i=0
total=10

echo "$i $total" | awk '{ for ( i=$1; i<=$2; i++) }'

- Muthu