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Renaming files in a folder to sequential numbers
...%04d.jpg" "$a") #04 pad to length of 4
mv -i -- "$i" "$new"
let a=a+1
done
using the -i flag prevents automatically overwriting existing files.
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How do I use a file grep comparison inside a bash if/else statement?
...PE being any command or sequence of commands, then:
if PIPE ; then
# do one thing if PIPE returned with zero status ($?=0)
else
# do another thing if PIPE returned with non-zero status ($?!=0), e.g. error
fi
For the record, [ expr ] is a shell builtin† shorthand for test expr.
Since grep...
A monad is just a monoid in the category of endofunctors, what's the problem?
...ote is from Saunders Mac Lane in Categories for the Working Mathematician, one of the foundational texts of Category Theory. Here it is in context, which is probably the best place to learn exactly what it means.
But, I'll take a stab. The original sentence is this:
All told, a monad in X is just a...
Error handling with node.js streams
...you are working in objectMode = true. The callback is called when you are done processing the chunk. This chunk is then pushed on to the next stream.
If you want a nice helper module that will enable you to do through stream really really easily, I suggest through2.
For error handling, keep readi...
How do I give text or an image a transparent background using CSS?
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In Firefox 3 and Safari 3, you can use RGBA like Georg Schölly mentioned.
A little known trick is that you can use it in Internet Explorer as well using the gradient filter.
background-color: rgba(0, 255, 0, 0.5);
filter: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColo...
round up to 2 decimal places in java? [duplicate]
I have read a lot of stackoverflow questions but none seems to be working for me. i am using math.round() to round off.
this is the code:
...
What is the most efficient way to deep clone an object in JavaScript?
What is the most efficient way to clone a JavaScript object? I've seen obj = eval(uneval(o)); being used, but that's non-standard and only supported by Firefox . I've done things like obj = JSON.parse(JSON.stringify(o)); but question the efficiency. I've also seen recursive copying funct...
Android: Go back to previous activity
...tp://developer.android.com/reference/android/content/Intent.html
As mentioned in the comments, if the activity is opened with startActivity() then one can close it with finish().
If you wish to use the Up button you can catch that in onOptionsSelected(MenuItem item) method with checking the item I...
error: No resource identifier found for attribute 'adSize' in package 'com.google.example' main.xml
...
please write one example
– Iman Marashi
Jan 22 '16 at 20:07
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An App ID with Identifier '' is not available. Please enter a different string
...fault in Safari. Didn't see that there are more entries... Because all the ones created by Xcode start with XC, they appear at the bottom...
– endavid
Sep 15 '19 at 10:43
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