Linux
# strings –a /proc/<pid_of_the_process>/environ
FreeBSD
# procstat -e <pid_of_the_process>
Solaris
# pargs -e <pid_of_the_process>
# strings –a /proc/<pid_of_the_process>/environ
# procstat -e <pid_of_the_process>
# pargs -e <pid_of_the_process>