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Full Discussion: [BASH] eval command not expanding variables as expected.
Top Forums UNIX for Beginners Questions & Answers [BASH] eval command not expanding variables as expected. Post 303041173 by ASGR on Saturday 16th of November 2019 05:58:32 AM
Old 11-16-2019
[BASH] eval command not expanding variables as expected.
Hi Guys,


I wrote a collection of bash functions years ago and now need to use them again but
I'm getting some error messages when eval tries to expand the variables names.


I recollect that I used the shopt command to set one of the options but I can't quite
remember the command that I used. However, I may be wrong regarding the shopt
command.


Anyway, the function in question is:
Code:
function array_load
 {
    local IFS=$'\n'
    eval "$1=( \$( < \"\${$2}\" ) )"
 }

This is the output from the sh -x command:
Code:
+ declare -i __ITR__
+ declare -a __FILE_SQL__
+ declare -a __TEMP_SQL__
+ array_load __FILE_SQL__ __SRC__
+ local 'IFS=
'
+ eval '__FILE_SQL__=( $( < "${__SRC__}" ) )'
++ __FILE_SQL__=($( < "${__SRC__}" ))
  /Users/Shared/#BASHLIB/type/array.bash: line 53: ~/djia.csv: No such file or directory

The __SRC__ variable contains a relative reference to a file i.e. ~/djia.csv but I've also
tried using an absolute reference from the root directory which also does not get found.


Any help would be appreciated.
TIA Guys. ;-)
 

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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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