Environment variables that you can customize for $HOME/.profile

Table 1 lists the environment variables that you can customize for $HOME/.profile.

Table 1. Environment variables that you can customize for $HOME/.profile
Environment variable	What it does
ENV	Specifies the name of the user's environment file, which is a shell script. ENV=$HOME/.setup specifies a file called .setup, which the user added to the home directory.
STEPLIB	Specifies STEPLIBs for individual users who have STEPLIB requirements that are different from those of other users. Tip: Use `STEPLIB=none`. However, there might be cases in which a specific library is needed; for example, STEPLIB=USER1.MY.USERLIB.
PATH	Appends your home directory to the current path. When you set up your own $HOME/.profile as superuser, specify the /usr/sbin directory in your PATH variable because some superuser utilities are in that directory instead of the /bin directory. Those utilities include automount, inetd, lm, mknod, ocsconfig, rlogind, uucpd, chroot and cron
PS1	Specifies the prompt character or string.
TZ	Specifies a different time zone if the user is in a remote location.
MAILRC	Specifies the name of the user's mail startup file. The default is $HOME/.mailrc.
MAIL	Specifies the name of the user's file for mail that the user does not save in some other file. The default is $HOME/mbox.
MBOX	Specifies the name of the user's file for mail that the user does not save in some other file. The default is $HOME/mbox.
DEAD	Specifies the name of the user's file for partial messages when an interrupt or error occurs when creating a message or delivering it. The default is $HOME/dead.letter.

In order for system programmers and administrators to run authorized utilities and to start daemons found in /usr/sbin, they must have a $HOME/.profile file with the PATH environment variable set as follows:

PATH=$PATH:/usr/sbin:$HOME: