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Full Discussion: Creating a PATH variable
Top Forums Shell Programming and Scripting Creating a PATH variable Post 303027854 by Circuits on Wednesday 26th of December 2018 03:41:22 PM
Old 12-26-2018
Creating a PATH variable
I am new to shell scripting and I ran into a couple lines of code which I don't completely understand:

Code:
PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/entity/bin
data_dir=/usr/local/entity/project

I believe data_dir to be a more conventional link to a directory. However, I am not sure what PATH is. It also seems like a location but maybe it's multiple possible locations? Does the : signify that the location could be either: /usr/bin, /bin, /usr/sbin or /usr/local/entity/bin? Is the : in this context similar to some function like [ is to the test function?
 

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LEARN ABOUT OPENSOLARIS

whereis

whereis(1B)					     SunOS/BSD Compatibility Package Commands					       whereis(1B)

NAME

       whereis - locate the binary, source, and manual page files for a command

SYNOPSIS

       /usr/ucb/whereis [-bmsu] [-BMS directory... -f] filename...

DESCRIPTION

       The  whereis utility locates source/binary and manuals sections for specified files. The supplied names are first stripped of leading path-
       name components and any (single) trailing extension of the form .ext, for example, .c. Prefixes of s. resulting from  use  of  source  code
       control are also dealt with. whereis then attempts to locate the desired program in a list of standard places:

	 etc
	 /sbin
	 /usr/bin
	 /usr/ccs/bin
	 /usr/ccs/lib
	 /usr/lang
	 /usr/lbin
	 /usr/lib
	 /usr/sbin
	 /usr/ucb
	 /usr/ucblib
	 /usr/ucbinclude
	 /usr/games
	 /usr/local
	 /usr/local/bin
	 /usr/new
	 /usr/old
	 /usr/hosts
	 /usr/include
	 /usr/etc

OPTIONS

       The following options are supported:

       -b    Searches only for binaries.

       -B    Changes or otherwise limits the places where whereis searches for binaries.

       -f    Terminates  the  last  directory list and signals the start of file names, and must be used when any of the -B, -M, or -S options are
	     used.

       -m    Searches only for manual sections.

       -M    Changes or otherwise limits the places where whereis searches for manual sections.

       -s    Searches only for sources.

       -S    Changes or otherwise limit the places where whereis searches for sources.

       -u    Searches for unusual entries. A file is said to be unusual if it does not have one entry of each requested type. Thus `whereis -m	-u
	     *' asks for those files in the current directory which have no documentation.

EXAMPLES

       Example 1 Finding files

       Find all files in /usr/bin which are not documented in /usr/share/man/man1 with source in /usr/src/cmd:

	 example% cd /usr/ucb
	 example% whereis -u -M /usr/share/man/man1 -S /usr/src/cmd -f *

FILES

	   o	  /usr/src/*

	   o	  /usr/{doc,man}/*

	   o	  /etc, /usr/{lib,bin,ucb,old,new,local}

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       chdir(2), attributes(5)

BUGS

       Since whereis uses chdir(2) to run faster, pathnames given with the -M, -S, or -B must be full; that is, they must begin with a `/'.

SunOS 5.11							    10 Jan 2000 						       whereis(1B)
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