Shell Programming and Scripting

I'm working on Aix 6.1 and using ksh shell.

The below works fine on Linux bash or ksh shell [tested both].

Code:

while IFS= read -r dirpath ; do
echo "Hi"
done  <<<"$var"

However, any such while loop that reads the input from file or variable using <<< fails on Aix system with the below error:

Below are the different while loops each having <<< for file input:

Code:

while IFS='\n' read -r line; do
while read -r line; do

Can someone please suggest what works for ksh on AiX 6.1 ?

ksh does not have the <<< (here string) operator. (An exception are few variants of ksh93.)
In ksh you can do

Code:

echo "$var" | 
  while IFS= read -r dirpath
do
  echo "Hi"
done

Note that ksh, unlike other shells, runs the last part of a pipe in the main shell. For ex

Code:

count=0
echo "$var" | 
  while IFS= read -r dirpath
do
  echo "Hi"
  (( count+=1 ))
done
echo $count

Other shells run it in a sub shell, so the $count updates are gone when back in the main shell.

@MadeinGermany: I love your answers !! They are precise

Works fine. I will test more conditions shorlty.