Unexpected "(" (expecting "}") Post: 303030754

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Top Forums Shell Programming and Scripting Unexpected "(" (expecting "}") Post 303030754 by Don Cragun on Friday 15th of February 2019 04:37:30 AM

02-15-2019

Registered User

Quote:

Originally Posted by ACorner

I fully understand why busybox is used on systems like JustEnoughOSes, after all that's the reason why I use LibreElec.
But it would be very helpfull if at least error messages would give a tiny hint that it's busybox that produces that error and not bash. It's not obvious that if you type an explicit command like /bin/bash that you end up in a "fake" version.
But that' another story.

I fully agree with you there. Note that if you were using a real bash, any diagnostic messages that it produces would include "bash:" at the start of the message. For example if I issue the command:

Code:

bash -c 'for i in *;do { cat "$i'

on macOS, I get two diagnostics:

Code:

bash: -c: line 0: unexpected EOF while looking for matching `"'
bash: -c: line 1: syntax error: unexpected end of file

each of which clearly indicates that the diagnostic came from bash (the first indicating that it is looking for a missing <double-quote> character and the second indicating that it is looking for a missing } and/or a missing done). This is why we asked you to be sure that you were showing us the exact, complete diagnostic messages you were getting when you reported the problem.

If the tools provided by busybox don't do that for you, you'll have a hard time trying to guess if the diagnostics you're seeing are coming from the shell or from one of the utilities invoked by the shell. This makes diagnosing problems in an environment like that much more difficult for you. I wish you luck.

Don Cragun

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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