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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 FREEBSD

manpath

MANPATH(1)						    BSD General Commands Manual 						MANPATH(1)

NAME

     manpath -- display search path for manual pages

SYNOPSIS

     manpath [-Ldq]

DESCRIPTION

     The manpath utility determines the user's manual search path from the user's PATH, and local configuration files.	This result is echoed to
     the standard output.

     -L  Output manual locales list instead of the manual path.

     -d  Print extra debugging information.

     -q  Suppresses warning messages.

IMPLEMENTATION NOTES

     The manpath utility constructs the manual path from two sources:
     1.   From each component of the user's PATH for the first of:
	  -   pathname/man
	  -   pathname/MAN
	  -   If pathname ends with /bin: pathname/../man
	  Note: Special logic exists to make /bin and /usr/bin look in /usr/share/man for manual files.
     2.   The configuration files listed in the FILES section for MANPATH entries.
     The information from these locations is then concatenated together.

     If the -L flag is set, the manpath utility will search the configuration files listed in the FILES section for MANLOCALE entries.

ENVIRONMENT

     The following environment variables affect the execution of manpath:

     MANLOCALES  If set with the -L flag, causes the utility to display a warning and the value, overriding any other configuration found on the
		 system.

     MANPATH	 If set, causes the utility to display a warning and the value, overriding any other configuration found on the system.

     PATH	 Influences the manual path as described in the IMPLEMENTATION NOTES.

FILES

     /etc/man.conf
	     System configuration file.
     /usr/local/etc/man.d/*.conf
	     Local configuration files.

SEE ALSO

     apropos(1), man(1), whatis(1), man.conf(5)

BSD
								 September 1, 2010							       BSD
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