12-02-2019
You may find this on-line version of "The Are of Unix Programming" useful:
The Art of Unix Programming
A quick google search for "Bash tips and tricks" turned up this fairly good article on bash:
101 Bash Commands and Tips for Beginners to Experts - DEV Community 👩*💻👨*💻
I pretty much learnt awk programming from this site . Initially I was amazed how easily awk could be used to solve problems posted here. I worked thru the solutions proposed by others and used google and other on-line resources to nut out what was going on. I did start with a lot of programming experience in other languages, which gave me a head start. Start by understanding the supplied solutions and work up to figuring out your own answers without looking at how others have done it first. Compare what you have come up with to the supplied answer. It's fairly important that you have access to a system you can trial and debug solutions on.
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LEARN ABOUT MOJAVE
urn-scheme
uri_urn(n) Tcl Uniform Resource Identifier Management uri_urn(n)
__________________________________________________________________________________________________________________________________________________
NAME
uri_urn - URI utilities, URN scheme
SYNOPSIS
package require Tcl 8.2
package require uri::urn ?1.1.2?
uri::urn::quote url
uri::urn::unquote url
_________________________________________________________________
DESCRIPTION
This package provides two commands to quote and unquote the disallowed characters for url using the urn scheme, registers the scheme with
the package uri, and provides internal helpers which will be automatically used by the commands uri::split and uri::join of package uri to
handle urls using the urn scheme.
COMMANDS
uri::urn::quote url
This command quotes the characters disallowed by the urn scheme (per RFC 2141 sec2.2) in the url and returns the modified url as its
result.
uri::urn::unquote url
This commands performs the reverse of ::uri::urn::quote. It takes an urn url, removes the quoting from all disallowed characters,
and returns the modified urls as its result.
BUGS, IDEAS, FEEDBACK
This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category uri of
the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have for
either package and/or documentation.
KEYWORDS
rfc 2141, uri, url, urn
CATEGORY
Networking
uri 1.1.2 uri_urn(n)