Shell Programming and Scripting

Details like that can cause a script to fail.

fl_mod_${module}_install

Should be???? Didn't you check?

Add a line to the file containing it to confirm that it is indeed loaded:

Code:

echo modules/httpd/module.sh
function fl_mod_httpd_order()
{
        echo "001000"
}

Or put set -x in the script to turn on debugging.

It has nothing to do with Linux; POSIX shell scripting is common to all *nix variants (and some other systems).

Quote:

and this style of code seem to come from PHP

It is nothing like PHP.


Some further comments:

Some of the files are missing a final newline. (It will probably not make a difference, but it should be there.)

You use a mixture of syntaxes for defining functions (POSIX, KSH and a combination of the two that is only valid in bash). Stick to the POSIX standard form:

Code:

function_name() COMPOUND_COMMAND

Where do you call the function fl1_load_modules_and_get_list?

The line that calls it is:

Code:

$(fl_mod_${module}_pre_install)

It is called in a subshell and therefore is not loaded into the running environment.

man bash:

COMMAND EXECUTION ENVIRONMENT
...
Command substitution, commands grouped with parentheses, and asynchronous commands are invoked in a subshell environment that is a duplicate of the shell environment...