Reference for unit 'Unix': Procedures and functions

`AssignPipe`		Create a set of pipe file handlers
`AssignStream`		Assign stream for in and output to a program
`FpExecL`		Execute process (using argument list, environment)
`FpExecLE`		Execute process (using argument list, environment)
`FpExecLP`		Execute process (using argument list, environment; search path)
`FpExecLPE`
`FpExecV`		Execute process
`FpExecVP`		Execute process, search path
`FpExecVPE`		Execute process, search path using environment
`fpFlock`		Lock a file (advisory lock)
`fpfStatFS`
`fpfsync`
`fpgettimeofday`		Return kernel time of day in GMT
`fpStatFS`
`fpSystem`		Execute and feed command to system shell
`FSearch`		Search for file in search path.
`fStatFS`		Retrieve filesystem information from a file descriptor.
`fsync`		Synchronize file's kernel data with disk.
`GetDomainName`		Return current domain name
`GetHostName`		Return host name
`GetLocalTimezone`		Return local timzeone information
`GetTimezoneFile`		Return name of timezone information file
`PClose`		Close file opened with POpen
`POpen`		Pipe file to standard input/output of program
`ReadTimezoneFile`		Read the timezone file and initialize time routines
`SeekDir`		Seek to position in directory
`SelectText`		Wait for event on text file.
`Shell`		Execute and feed command to system shell
`SigRaise`		Raise a signal (send to current process)
`StatFS`		Retrieve filesystem information from a path.
`TellDir`		Return current location in a directory
`WaitProcess`		Wait for process to terminate.
`WIFSTOPPED`		Check whether the process is currently stopped.
`W_EXITCODE`		Construct an exit status based on an return code and signal.
`W_STOPCODE`		Construct an exit status based on a signal.

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