Any idea what these scripts do?

Echo Kilo · 11-09-2004, 09:16 PM

Any idea what these scripts do? I coudn't get the count command to work.

#!/bin/bash
string="The quick brown fox jumped over the lazy dog"
for i in `count 5 20`
do
echo $string | cut –c $i
done

#!/bin/bash
low_val=$1;high_val=$2
while [ $low_val -le $high_val ]
do
echo -n $low_val " "
low_val=`expr $low_val + 1`
done

Oops, I just realized this is in the wrong category forum.

ranger_nemo · 11-09-2004, 09:30 PM

You can do integer math inside a $(( )), or with a let statement. The following three statements should all make $x = 2...
x=$((1+1))
let x=1+1
let x='1 + 1'

Code:

#!/bin/bash
let low_val=0
let high_val=20
while [ $low_val -le $high_val ]
do
  echo -n $low_val " "
  low_val=$(($low_val + 1))
done

I've not see the count line before. A better way to do it might be a while loop as above.

Echo Kilo · 11-09-2004, 10:01 PM

But what do they do? This is a question we had in class today and no one knew.

Here are the questions:

A. What do these two scripts do?

B. Do these scripts interact? If so, how?

C. What change(s), if any, would increase portability?

D. What change(s), if any, would make them easier to understand?

E. Why are these two scripts separate? Why not combine them into one?

XavierP · 11-10-2004, 01:06 AM

2 things:

This is clearly not a success story - if anything, it belongs in Programming. Moved.

The second is a quote from the Rules: " Do not expect LQ members to do your homework - you will learn much more by doing it yourself."

Hko · 11-10-2004, 03:15 PM

Quote:

Originally posted by Echo Kilo
I coudn't get the count command to work.

"count" should be "seq".