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Full Discussion: Environment variables
Top Forums UNIX for Dummies Questions & Answers Environment variables Post 302464274 by DGPickett on Tuesday 19th of October 2010 04:07:29 PM
Old 10-19-2010
I seem to recall csh was semi-case-insensitive, another reason to stay away.

'PATH' is hard coded into exec(), the library path variable whatever it is on the brand in the synamic linker, MANPATH into man, and '$PWD' changes no matter how you change the working directory, so the environment has many frozen variables. I checked my local CScope web utility. Lots of include files mention PATH, but none has "PATH" -- maybe in the kernel C?

Code:
                                                                             /usr/include/limits.h  <unknown>     71  #  define _POSIX_PATH_MAX	255 	/* The number of bytes in a pathname */
                                                                             /usr/include/limits.h  <unknown>    284  #    define PATH_MAX   	1023	/* max number of characters in a pathname (not
                                                                          /usr/include/sys/param.h  <unknown>    388  * MAXPATHLEN defines the longest permissable path length
                                                                          /usr/include/sys/param.h  <unknown>    398  #define MAXPATHLEN	1024
                                                                 /usr/include/.unsupp/sys/_errno.h  <unknown>     22  #  define EPATHREMOTE		133	/* Pathname is remote */
                                                                         /usr/include/sys/unistd.h  <unknown>    712  #  define _PC_PATH_MAX		4  /* PATH_MAX: Max # of bytes in a pathname */
                                                                         /usr/include/sys/unistd.h  <unknown>    800  #  define _CS_PATH	200	/* Search path that finds all POSIX.2 utils */
                                                                         /usr/include/sys/unistd.h  <unknown>    873  #  define GF_PATH	"/etc/group"	/* Path name of the "group" file */
                                                                         /usr/include/sys/unistd.h  <unknown>    874  #  define PF_PATH	"/etc/passwd"	/* Path name of the "passwd" file */
                                                                         /usr/include/sys/unistd.h  <unknown>    875  #  define IN_PATH	"/usr/include"	/* Path name for <...> files */
                                                                         /usr/include/sys/unistd.h  <unknown>    880  #  define CS_PATH	  \
                                                                         /usr/include/sys/ptrace.h  <unknown>     79  #define	PT_GET_PROCESS_PATHNAME	23 /* Get Pathname for exec'd file */
                                                                         /usr/include/sys/ptrace.h  <unknown>     81  #define IS_PTRACE_REQ(i)   ((i) >= PT_SETTRC && (i) <= PT_GET_PROCESS_PATHNAME)
                                                                   /usr/include/sys/scall_define.h  <unknown>    323  #define	SYS_PATHCONF	230
                                                                   /usr/include/sys/scall_define.h  <unknown>    325  #define	SYS_FPATHCONF	231
                                                                   /usr/include/sys/scall_define.h  <unknown>    751  #define	SYS_SENDPATH	480
                                                                   /usr/include/sys/scall_define.h  <unknown>    755  #define	SYS_SENDPATH64	482
                                                                   /usr/include/sys/scall_define.h  <unknown>    761  #define	SYS_MODPATH	485
                                                                      /usr/include/sys/semglobal.h  <unknown>    231  * DLM_MPATH_LOCK_ORDER		mod_mpath_lock: rw-sleep
                                                                      /usr/include/sys/semglobal.h  <unknown>    241  #define DLM_MPATH_LOCK_ORDER	DLM_TOP_LOCK_ORDER - 20

 

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LEARN ABOUT ULTRIX

userfile

USERFILE(5)							File Formats Manual						       USERFILE(5)

Name
       USERFILE - defines uucp security

Syntax
       /usr/lib/uucp/USERFILE

Description
       The  utility  uses the USERFILE to establish what access a remote system can have to the local system.  An entry should exist for each sys-
       tem.  If no entries exist for a particular system, the default entries are used.  The entries for particular  systems  have  the  following
       format:

       login-name , node-name X # path-name

       login-name
		 The name with which the remote system logs in.

       node-name The name of the remote node.

       X#	 The  execution  level	for  the remote system.  The remote system can execute commands defined in the file that have an execution
		 level less than or equal to the number #.

       path-name The remote system can access anything at the local system with this prefix.

       Two entries must also be provided for systems not otherwise listed:

	    remote, X# path-name ...
	    local, X# path-name ...

       These entries define the execution level and access pathnames for the local system and all remote systems not defined by specific entries.

Examples
       remote, X1 /usr/spool/uucppublic
       local, X9 /
       max,systemY /usr/sources /usr/src/share
       max,systemZ X3 /usr
       In the above example, the node named systemY with the login name max has access to anything with the pathname prefixes and The  node  named
       systemZ	with  the  login  name max can execute commands defined in with an execution level of 3 or lower.  It can access anything with the
       pathname prefix

       Any other remote systems can execute commands defined in with an execution level of 1 or 0.  They can access  anything  with  the  pathname
       prefix of

       Users on the local system can execute any of the commands defined in and access anything on the system.

See Also
       Guide to the uucp Utility

																       USERFILE(5)
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