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Hi, good!
But just you can improve the performance of the script avoiding the first step where you execute all the systems commands invocation. If you move them to each select cases. Cosider that in the firs option: srfr the (vmstat 1 2) is too slow, so if you want to execute the orther options: numperm|pctused|pgspaceused, is better to avoid the invocation of the (vmstat 1 2), just invoking the vmstat -v that is faster. :-)

So here the script modified:
-----------------------------------------------------------------------------
#!/bin/sh
#
#-------------------------------------------------------
# Check du taux d'utilisation mmemoie sur AIX - Fabrice Dupre - 11/01/08
# Moving the systems command invocation to each select cases. - LUCUP - Lucas Moreschi - 27/02/2015.
#-------------------------------------------------------
Syntaxe() {
echo " "
echo " Command Syntaxe: check_aix_mem.sh [-c val] [-w val] [-t srfr|numperm|pctused|pgspaceused]"
echo " "
exit 3;
}
#-------------------------------------------------------
if [[ $# == 0 ]]
then
Syntaxe
fi
valw=0
valc=0
while [[ $# > 0 ]]
do
par=$1
case $par in
-c) shift
valc=$1;;
-w) shift
valw=$1;;
-t) shift
type_sortie=$1;;
-h) shift
Syntaxe
exit;;
*) shift;;
esac
done
ok=0
str_out="CHARGE MEM:"
xcpu=0
total=0
case $type_sortie in
srfr)
retour_srfr=$(vmstat 1 2 | awk '{ print $8" "$9 }' | tail -1)
fr=$(echo $retour_srfr | cut -d " " -f1 )
sr=$(echo $retour_srfr | cut -d " " -f2 )

#echo "sr : $sr - fr : $fr"
if [[ $sr -gt 0 ]] && [[ $fr -gt 0 ]]
then
str_out="$str_out $(expr $sr \/ $fr)% "
if (( $(expr $sr \/ $fr) > $valw ))
then
ok=1
fi
if (( $(expr $sr \/ $fr) > $valc ))
then
ok=2
fi
# Sortie au format perfparse
echo "$str_out Srfr = $(expr $sr \/ $fr)%;| Srfr=$(expr $sr \/ $fr)%;$valw;$valc"; exit $ok
# Sortie au format non perfparse
#echo "$str_out Srfr = $(expr $sr \/ $fr)%"; exit $ok
else
str_out="$str_out 0% "
# Sortie au format perfparse
echo "$str_out Srfr = 0%;| Srfr=0%;$valw;$valc"; exit $ok
# Sortie au format non perfparse
#echo "$str_out Srfr = 0%;"; exit $ok
fi
;;
numperm)
retour_numperm=$(vmstat -v | grep numperm | sed 's/ //g' | cut -d " " -f 2)
#echo "Numperm : $retour_numperm"
str_out="$str_out $retour_numperm% "
if (( $retour_numperm > $valw ))
then
ok=1
fi
if (( $retour_numperm > $valc))
then
ok=2
fi
# Sortie au format perfparse
echo "$str_out Numperm = $retour_numperm%;| Numperm=$retour_numperm%;$valw;$valc"; exit $ok
;;
pctused)
retour_inuse=$(svmon | awk '{ print $3 }' | head -2 | tail -1)
retour_memory=$(svmon | awk '{ print $2 }' | head -2 | tail -1)
retour_p_used=$(expr 100 \* $retour_inuse \/ $retour_memory)
str_out="$str_out $retour_p_used% "
if (( $retour_p_used > $valw))
then
ok=1
fi
if (( $retour_p_used > $valc))
then
ok=2
fi
# Sortie au format perfparse
echo "$str_out MemUsed = $retour_p_used%;| MemUsed=$retour_p_used%;$valw;$valc"; exit $ok
;;
pgspaceused)
retour_pguse=$(svmon | grep "pg space" | awk '{ print $3 }')
retour_memory=$(svmon | awk '{ print $2 }' | head -2 | tail -1)
retour_pg_used=$(expr 100 \* $retour_pguse \/ $retour_memory)
str_out="$str_out $retour_pg_used% "
if (( $retour_pg_used > $valw))
then
ok=1
fi
if (( $retour_pg_used > $valc))
then
ok=2
fi
# Sortie au format perfparse
echo "$str_out PgSpaceUsed = $retour_pg_used%;| PgSpaceUsed=$retour_pg_used%;$valw;$valc"; exit $ok
;;
esac

Really useful! Easy and quick to install!
Thanks a lot!