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Full Discussion: reading configuration files in bash. Best way?
Top Forums Shell Programming and Scripting reading configuration files in bash. Best way? Post 302420872 by Bubnoff on Wednesday 12th of May 2010 07:23:51 PM
Old 05-12-2010
reading configuration files in bash. Best way?
Context:
I have a random pin number generator script that reads a tab-delimited file containing a location and a count:

eg.,
Code:
mansfield     30
tokyo          15
smithville     34

It produces random PIN# in the amount specified by the number in the second column.

Currently, I read the file and execute the generator function as follows:
Code:
while read line
do
    BRANCH=$(awk -F"\t" '{print $1}' <<< "$line")
    CNT=$(awk -F"\t" '{print $2}' <<< "$line")
    rand_pass "$BRANCH" $CNT
done < $file

I could also do something like this:
Code:
declare -a Array3
saveIFS="$IFS"
IFS=$'\n'
Array3=($(<$LIST))
IFS="$saveIFS"

Then:
Code:
for i in ${!Array3[@]}
do
    A=${Array3[i]//[[:digit:][:space:]]/}
    B=${Array3[i]//[[:alpha:][:space:]]/}
    rand_pass "$A" $B
done

Or ...I could source the file ....but ....

The script won't know the names or amount of parameters in the file.
The file will have stuff added to it over time.
I could chuck it into the script:
Code:
$ script.sh < file.txt

Then deal with the passed variables that way ...but why?
Is there a point or advantage to sourcing the file in this case?
Have I already arrived at the ideal ( or one of several ) solution?

Thanks for reading!

Bubnoff
 

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LEARN ABOUT PHP

libbash

LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME

     libbash -- A bash shared libraries package.

DESCRIPTION

     libbash  is  a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may
     want to load and use in scripts of your own.

     It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries.

     Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1).  A bash shared library that can be  loaded
     using
     ldbash(1) must answer 4 requirments:

     1.     It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash).

     2.     It must contain a line that begins with '#EXPORT='.  That line will contain (after the '=') a list of functions that the library
	    exports.  I.e. all the function that will be usable after loading that library will be listed in that line.

     3.     It must contain a line that begins with '#REQUIRE='.  That line will contain (after the '=') a list of bash libraries that are
	    required for our library.  I.e. every bash library that is in use in our bash library must be listed there.

     4.     The library must be listed (For more information, see ldbashconfig(8)).

   Basic guidelines for writing library of your own:
     1.     Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions.

     2.     Try to declare all variables intended for internal use as local.

     3.     Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with:
		  __<library_name>_
	    For example, internal function myfoosort of hashstash library should be named as
		  __hashstash_myfoosort
	    This helps to avoid conflicts in global name space when using libraries that come from different vendors.

     4.     See html manual for full version of this guide.

AUTHORS

     Hai Zaar <haizaar@haizaar.com>
     Gil Ran <ril@ran4.net>

SEE ALSO

     ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1)

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