[bash]Stripping lines from a list Post: 302179977

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Top Forums UNIX for Dummies Questions & Answers [bash]Stripping lines from a list Post 302179977 by era on Saturday 29th of March 2008 08:36:12 AM

03-29-2008

Registered User

Quote:

Originally Posted by noratx

No offence taken. =)
I'm pretty much a newbie, so writing hideous scripts is what you do at the beginning (i think).

Yeah, sorry about the tone there.

The rest of the script really looks quite reasonable, apart from the inexplicable urge to spoon-feed nl with cat, as if it couldn't read the file itself. Ditto for awk etc.

Another minor nit I have is about how you capture stuff with backticks only to echo back the output to the user. Just take out the backticks and let the output go to standard output if you want the user to see it. (Echoing also has some subtle side effects, which you might or might not want. You avoid a lot of quoting quandaries if you just don't do that.)

Quote:

The paths and programs are entered in the beginning of the total script (like ncftpls=/usr/local/bin/ncftpls), in case you would wonder why i use $ncftpls and such.

Frankly, I think that's a dubious practice -- just make sure your PATH is set up correctly, and use the actual program names without putting them in variables. That's easier to port to a different system where the paths are different, too.

All in all, not too hideous at all. Hope this helps.

Last edited by era; 03-29-2008 at 09:42 AM.. Reason: Remark on echo `output from backticks` too

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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)

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