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How to create a file with a given size in Linux?
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dd if=/dev/zero of=upload_test bs=file_size count=1
Where file_size is the size of your test file in bytes
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iterating over and removing from a map [duplicate]
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As of Java 8 you could do this as follows:
map.entrySet().removeIf(e -> <boolean expression>);
Oracle Docs: entrySet()
The set is backed by the map, so changes to the map are reflected in the set, and vice-versa
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Add a prefix string to beginning of each line
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# If you want to edit the file in-place
sed -i -e 's/^/prefix/' file
# If you want to create a new file
sed -e 's/^/prefix/' file > file.new
If prefix contains /, you can use any other character not in prefix, or
escape t...
Why does this code segfault on 64-bit architecture but work fine on 32-bit?
...even on a platform where sizeof(int)==sizeof(int*) holds true, for example if the calling convention used different registers for returning pointers than integers)
The comp.lang.c FAQ has an entry discussing why casting the return from malloc is never needed and potentially bad.
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Showing which files have changed between two revisions
...ave been separated for a while and wanted to know which files have been modified.
18 Answers
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How to split a comma-separated string?
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If you need to keep empty entries (eg.for consistent array length) use split(",",-1) as per stackoverflow.com/questions/14602062/…
– Fast Engy
Jul 16 '15 at 2:16
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Error handling in getJSON calls
...cally (by configuring your AJAX calls before actually calling them) or specifically (with method chain).
'generic' would be something like:
$.ajaxSetup({
"error":function() { alert("error"); }
});
And the 'specific' way:
$.getJSON("example.json", function() {
alert("success");
})
.succ...
Converting string to byte array in C#
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If you already have a byte array then you will need to know what type of encoding was used to make it into that byte array.
For example, if the byte array was created like this:
byte[] bytes = Encoding.ASCII.GetBytes(someSt...
Setting “checked” for a checkbox with jQuery
...prop('checked', true);
$('.myCheckbox').prop('checked', false);
DOM API
If you're working with just one element, you can always just access the underlying HTMLInputElement and modify its .checked property:
$('.myCheckbox')[0].checked = true;
$('.myCheckbox')[0].checked = false;
The benefit to ...
How to iterate over rows in a DataFrame in Pandas
..., it does not preserve dtypes across the rows." Also, "You should never modify something you are iterating over." According to pandas 0.19.1 docs
– viddik13
Dec 7 '16 at 16:24
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