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+.Dd October 8, 2015
+.Dt ENV 1
+.Os sbase
+.Sh NAME
+.Nm env
+.Nd modify the environment, then print it or run a command
+.Sh SYNOPSIS
+.Nm
+.Op Fl i
+.Oo Fl u Ar var Oc ...
+.Oo Ar var Ns = Ns Ar value Oc ...
+.Oo Ar cmd Oo arg ... Oc Oc
+.Sh DESCRIPTION
+.Nm
+unsets each
+.Ar var ,
+then adds or sets each
+.Ar ( var , value )
+tuple in the environment.
+.Pp
+If
+.Ar cmd
+is given, it is executed in this new environment;
+otherwise, the modified environment is printed to stdout.
+.Sh OPTIONS
+.Bl -tag -width Ds
+.It Fl i
+Completely ignore the existing environment and execute
+.Ar cmd
+only with each
+.Ar ( var , value )
+tuple specified.
+.It Fl u Ar var
+Unset
+.Ar var
+in the environment.
+.El
+.Sh SEE ALSO
+.Xr printenv 1 ,
+.Xr putenv 3 ,
+.Xr environ 7
+.Sh STANDARDS
+POSIX.1-2013.
+.Pp
+The
+.Op Fl u
+flag is an extension to that specification.