env - set environment for command

     env [-ia] [name=value] ...  [utility [argument...]]

     Env modifies its environment according to the name=value  arguments,  and
     executes utility with the given arguments and the modified environment.

     If no utility is specified then the modified environment  is  printed  as
     name=value strings, one per line.


     -i   Use  exactly  the  environment  specified  by  the  arguments;   the
          inherited environment is ignored.

     -a   Specify all arguments  for  the  utility,  i.e.  the  first  of  the
          arguments  is  used  as  argv[0],  the  program  name.  Normally the
          program name is utility itself.


     PATH    The path used to find utility.  It is as modified  by  env,  i.e.
             not the inherited PATH.

     sh(1), execvp(3), environ(5).

     The return code is 0 after successfully printing the environment, 1 on an
     error  within  env,  126  if the utility could not be executed, or 127 if
     utility could not be found.  Appropriate diagnostic messages are  printed
     on  standard  error.  If utility can be executed then it replaces env, so
     the return code is then the return code of utility.

     When run from the standard shell env  is  only  useful  with  options  or
     without  arguments.   Otherwise the shell can do exactly what env can do,
     simply omit the word "env" on the command line.

     One interesting use of env is with #! on the first line of  a  script  to
     forge a PATH search for an interpreter.  For example:

          #!/usr/bin/env perl

     This will find the Perl interpreter if it  is  within  the  user's  PATH.
     Most UNIX-like systems have env in /usr/bin, but perl may be anywhere.

     Kees J. Bot <kjb@cs.vu.nl>