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These functions deal with process identification, process groups, system
identification, system time, environment variables, and terminal
identification.  The following functions are defined:

_bgetcmd
    get command line

clearenv
    delete environment variables

getcmd
    get command line

getpid
    return process ID of calling process

getenv
    get environment variable value

isatty
    determine if file descriptor associated with a terminal

putenv
    add, change or delete environment variable

_searchenv
    search for a file in list of directories

setenv
    add, change or delete environment variable