Hi Graham,
I run the command "env" with root user, then the system issues the infomations below:
tsm_standby:/usr/sap/trans/tmp/AIXinst/swpm> env
_=/usr/bin/env
LANG=en_US
LOGIN=root
PATH=/usr/bin:/etc:/usr/sbin:/usr/ucb:/usr/bin/X11:/sbin:/usr/java14/jre/bin:/usr/java14/bin:/usr/lpp/mmfs/bin
EXTENDED_HISTORY=ON
LC__FASTMSG=true
HISTFILE=/var/adm/hist/root/.hist.tsm_standby.haieroot:root
LOGNAME=root
MAIL=/usr/spool/mail/root
LOCPATH=/usr/lib/nls/loc
PS1=tsm_standby:$PWD>
USER=root
AUTHSTATE=files
ISC_HOME=/opt/IBM/ISC601
WAS_HOME=/opt/IBM/ISC601/AppServer
SHELL=/usr/bin/ksh
ODMDIR=/etc/objrepos
HISTSIZE=10000
HOME=/
HISTDATEFMT=%d-%m-%y.%H:%M:%S
TERM=vt100
MAILMSG=[YOU HAVE NEW MAIL]
PWD=/usr/sap/trans/tmp/AIXinst/swpm
TZ=BEIST-8
A__z=! LOGNAME
NLSPATH=/usr/lib/nls/msg/%L/%N:/usr/lib/nls/msg/%L/%N.cat