exec $SHELL cause me to lose $HOST in PS1 ??

[Sammy_2]

in user's .profile
=====================
HOST=`hostname|cut -c1-10`
USER=`whoami`
ORACLE_SID=esqab
export PS1='$HOST:$USER:$ORACLE_SID:$PWD>
============================
After login see the following PS1 prompt:
ojrdhes4:escript:esqab:/users/escript>

================================


ojrdhes4:escript:esqab:/users/escript> echo $SHELL
/usr/bin/ksh

Why do I lost my $HOST and $USER ?(see below)
when I run this exec command.

ojrdhes4:escript:esqab:/users/escript> exec $SHELL
::esqab:/users/escript>
(the above line is the output of exec $SHELL with 2 double colons)




Thanks in advance.

[Laurent Menase · Accepted solution]

you can either do
export HOST
export USER
or
PS1="$HOST:$USER"':$ORACLE_SID:$PWD'

So HOSTS and USER are evaluated before the affectation.

[Sammy_2]

Laurent,
Bingo. That's what i needed. I went with "" suggestions.
Thanks bunch.