Adding who, chroot, env and split.

Thanks "Galos, David" <galosd83@students.rowan.edu>!

env.1

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+.TH ENV 1 sbase\-VERSION
+.SH NAME
+env \- modify the environment, then print it or run a command.
+.SH SYNOPSIS
+.B env
+.RB [ \-i ]
+.RB [ \-u 
+.IR name ]...
+.RI [ name=value ]...
+.RI [ cmd 
+.RI [ arg ...]]
+
+.SH DESCRIPTION
+.B env
+removes part of the environment according to the flags, then adds or 
+sets each variable specified by
+.IR name 
+to equal
+.IR value .
+
+If 
+.IR cmd
+is given, it is executed in this new environment; otherwise, the 
+modified environment is printed to standard out.
+
+.SH OPTIONS
+.TP
+.B \-i
+Comptetely ignore the existing environment; start fresh.
+
+.TP
+.B \-u name
+Unsets
+.IR name
+from the environment.
+
+.SH SEE ALSO
+.IR printenv (1)
+.IR putenv (3)
+.IR environ (7)
+