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INTRO(1V)	    UNIX Programmer's Manual		INTRO(1V)



[1mNAME
     [0mintro - introduction to System V compatibility commands

[1mDESCRIPTION
     [0mVarious commands are provided in the directory /_u_s_r/_5_b_i_n to
     offer compatibility with widely used System V commands.
     These commands are intended to be reasonably conformant with
     the X/Open Portability Guide Issue 3.  For information about
     how to use such commands in a portable fashion this guide
     should be consulted, rather than these manual pages, as the
     manual pages describe some facilities which are not included
     in the X/Open specification.

     In many cases if a command exists in /_u_s_r/_5_b_i_n a command
     with a similar name but different semantics will exist else-
     where in the system - probably /_u_s_r/_b_i_n or /_u_s_r/_u_c_b.  If
     this is so the other command will be documented in the
     appropriate manual page, normally _c_o_m_m_a_n_d(1).

     The order of directories in the shell [1mPATH [0menvironment vari-
     able controls which environment a user of that shell will
     see.  Two orders are possible:

     [1m...:/usr/5bin:/usr/bin:/usr/ucb:...
	  [0mThis ordering gives a System V (X/Open) environment.
	  BSD commands may also be available, but where a con-
	  flict in command semantics exists the X/Open specifica-
	  ton will be followed.  The _m_a_n(1) program will locate
	  ([1m1V[0m) pages in preference to ([1m1[0m) ones.

     [1m...:/usr/ucb:/usr/bin:/usr/5bin:...
	  [0mThis ordering gives a BSD environment.  System V com-
	  mands may also be available, where their name does not
	  clash with a BSD command.  The _m_a_n(1) program will
	  locate section ([1m1[0m) manual pages in preference to those
	  from section ([1m1V[0m).

     Other orderings of these three directories are possible, but
     will give unpredictable semantics.  The contents of the
     directory /_u_s_r/_b_i_n do not consist solely of commands with
     consistent semantics.














Printed 31/1/92     Revision 1.1 of 22/10/90			1



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