ksh scripting, For loop

问题

#!/bin/ksh
#########################     
for i in {1..30} ;do
  echo $i
done

output is:

{1..30}  

What is wrong in my code?

回答1:

{1..30} belongs to bash.

Use this:

for((i=1;i<=30;i++)); do
    echo $i
done

回答2:

Alternatively you can switch to a while construction:

i=1
while (( i <= 30 ))
do
   echo $i
   (( i+=1 ))
done

回答3:

 for {set x 0} {$x<10} {incr x} {
             puts "x is $x"
           }

来源：https://stackoverflow.com/questions/9977485/ksh-scripting-for-loop