The printenv command displays the values of environment variables. If you specify the Name parameter, the system only prints the value associated with the parameter you requested. If you do not specify the Name parameter, the printenv command displays all current environment variables, showing one Name =Value sequence per line.
For example, to find the current setting of the MAILMSG environment variable, type:
printenv MAILMSG
Press Enter.
The command returns the value of the MAILMSG environment variable. For example:
YOU HAVE NEW MAIL
See the printenv command in the AIX 5L Version 5.1 Commands Reference for the exact syntax.