In this post, Perderabo's script says

echo 05/06/25 14:15:56 | IFS=" /:" read Y1 M1 D1 h1 m1 s1

which, if I am not wrong, will break the input into Y1, M1 et al.

I tried the following in my code

#! /bin/ksh
# per.sh
typeset -R2 HOUR=00
typeset -R2 MIN=00
typeset -R2 SEC=00

TIME=09:12:23
echo $TIME | IFS=" :" read HOUR MIN SEC
echo $HOUR$MIN$SEC
echo $TIME

it works fine on Solaris, but breaks on RH.
the "problem" is read-ing the vars off the 'pipe' - reading off the pipe creats a child process. Once read-ing is done, child process exits - no vars get exported to the parent.

Just as an illustration:

#! /bin/ksh
# per.sh
typeset -R2 HOUR=00
typeset -R2 MIN=00
typeset -R2 SEC=00

TIME=09:12:23
echo "${TIME}" > /tmp/vino.txt
IFS=" :" read HOUR MIN SEC < /tmp/vino.txt
echo $HOUR$MIN$SEC
echo $TIME

See read command for more info.