env(1) - set and print environment {oss}

printenv(1) - print out the environment {oss}

Applications and Utilities

getenv putenv setenv unsetenv (3) - environment variable functions {oss}

Libraries and Functions

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The name of the currently running program is discussed at Running Process Information - Getting information on running processes.

See also Program Configuration Data

Up to Execution

See also: Local Process Communication - Communication between processes running on the same system. Synchronization. File locking. Signals. FIFOs, pipes, et al

See also: Process Creation and Control - covers child process control (like sending signals), renice, fork, et al