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How do I parse command line arguments in Bash?

...as non-opt/last argument: #93.184.216.34 example.com To better understand ${i#*=} search for "Substring Removal" in this guide. It is functionally equivalent to `sed 's/[^=]*=//' <<< "$i"` which calls a needless subprocess or `echo "$i" | sed 's/[^=]*=//'` which calls two needless subp...
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Do copyright dates need to be updated? [closed]

Every now and then I see a web site that has an old copyright date. In my mind, I always think "Look at the sucker who forgot to update his copyright year!" Then, while I was hard-coding a copyright year into the site I'm currently designing, it suddenly struck me: ...
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What is the purpose of mock objects?

I am new to unit testing, and I continously hear the words 'mock objects' thrown around a lot. In layman's terms, can someone explain what mock objects are, and what they are typically used for when writing unit tests? ...
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Round to 5 (or other number) in Python

... I don't know of a standard function in Python, but this works for me: Python 2 def myround(x, base=5): return int(base * round(float(x)/base)) Python3 def myround(x, base=5): return base * round(x/base) It is easy to see why the a...
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Virtualbox “port forward” from Guest to Host [closed]

... Network communication Host -> Guest Connect to the Guest and find out the ip address: ifconfig example of result (ip address is 10.0.2.15): eth0 Link encap:Ethernet HWaddr 08:00:27:AE:36:99 inet addr:10.0.2.15 Bcast:10.0.2.255 Mask:255.255.255.0 Go to Vbox inst...
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What are the options for storing hierarchical data in a relational database? [closed]

...in this thread suggested. Use an Adjacency List to maintain the hierarchy and use Nested Sets to query the hierarchy. The problem up until now has been that the coversion method from an Adjacecy List to Nested Sets has been frightfully slow because most people use the extreme RBAR method known as ...
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How to trigger a phone call when clicking a link in a web page on mobile phone

...el: scheme. So use <a href="tel:555-555-5555">555-555-5555</a> and you should be good to go. If you want to use it for an image, the <a> tag can handle the <img/> placed in it just like other normal situations with : <a href="tel:555-555-5555"><img src="path/to/phon...
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Why exactly is eval evil?

I know that Lisp and Scheme programmers usually say that eval should be avoided unless strictly necessary. I’ve seen the same recommendation for several programming languages, but I’ve not yet seen a list of clear arguments against the use of eval . Where can I find an account of the potentia...
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How to set Oracle's Java as the default Java in Ubuntu?

... new version. If you want to set JAVA_HOME environment variables globally and at system level means use should set in /etc/environment file. share | improve this answer | fo...
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Sort objects in ArrayList by date?

...MyObject o) { return getDateTime().compareTo(o.getDateTime()); } } And then you sort it by calling: Collections.sort(myList); However sometimes you don't want to change your model, like when you want to sort on several different properties. In that case, you can create comparator on the f...