ksh: Iterate through a range

Question

How can I iterate through a simple range of ints using a for loop in ksh?

For example, my script currently does this...

for i in 1 2 3 4 5 6 7
do
   #stuff
done

...but I'd like to extend the range way above 7. Is there a better syntax?

Thanks!

Answer 1

While loop?

while [[ $i -lt 1000 ]] ; do
    # stuff
   (( i += 1 ))
done

Answer 2

Curly brackets?

for i in {1..7}
do
   #stuff
done

Answer 3

ksh, Bash and zsh all understand C-like for loop syntax:

for ((i=1; i<=9; i++))
do
    echo $i
done

Unfortunately, while ksh and zsh understand the curly brace range syntax with constants and variables, Bash only handles constants (including Bash 4).

Answer 4

seq - but only available on linux.

for i in `seq 1 10`
do 
    echo $i
done

there are other options for seq. But the other solutions are very nice and more important, portable. Thx

Answer 5

Curly brackets {1..7} don´t work in ksh. They do in Linux, because linux's ksh is a symlink to bash shell.

Also c-like sintax doesn´t work in the proper korn shell neither.

Answer 6

on OpenBSD, use jot:

for i in `jot 10`; do echo $i ; done;