bash read within function with arguments Post: 302553726

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Top Forums Shell Programming and Scripting bash read within function with arguments Post 302553726 by serverchief on Thursday 8th of September 2011 11:22:49 AM

09-08-2011

Registered User

Hi Corona,

Thanks for the help, i got it to work and decided to take it step further. I'm hoping you would know what i'm doing wrong.

I would like for the user to be prompted, but if value for variable exists, display it in brackets and if user presses enter without modifying the string, the same value is used for that variable. However, in my attempt to headlock $1=$var within function and if/else statement fail with "command not found".

Output
IPADDRESS: [testhost1]
./main.sh: line 23: DHCPIPADDRESS=testhost1: command not found

My code (i begin adding tempvars in attempt to debug and resolve the issue, but havenot had much luck)

Code:

function settings_verify_entry(){
        if [ ! -z "${!1}" ]
        then
                        tempvar3="${!1}"
                        read -p "$2: ["${!1}"] " $1
                        tempvar=$1
                        if [ -z "${!tempvar}" ]
                                then
                                "$1"="$tempvar3"
                        fi
        else
                        while [ -z "${!1}" ]
                                do
                                       read -p "$2: " $1
                                done
        fi
}

Also, i'd like to fill the gap in this area, what is this concept called and where would i find more details on it? My basic google search did not yield any results, but i'm guessing my keywords arent correct.

Once again thanks

-ilya

serverchief

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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)

Linux								       Epoch								     Linux

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