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get just the integer from wc in bash
...n different formats in different platforms. For example:
In OS X:
$ echo aa | wc -l
1
In Centos:
$ echo aa | wc -l
1
So using only cut may not retrieve the number. Instead try tr to delete space characters:
$ echo aa | wc -l | tr -d ' '
...
Regular expression to match non-ASCII characters?
..._text = function (text) {
var regex = /([\u0041-\u005A\u0061-\u007A\u00AA\u00B5\u00BA\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u0527\u0531-\u0556\u0559...
Can two different strings generate the same MD5 hash code?
...e code (alternate link to the paper).
Another test:
$ echo '0e306561559aa787d00bc6f70bbdfe3404cf03659e704f8534c00ffb659c4c8740cc942feb2da115a3f4155cbb8607497386656d7d1f34a42059d78f5a8dd1ef' | xxd -r -p | tee >/dev/null >(md5) >(sha1sum)
756f3044edf52611a51a8fa7ec8f95e273f21f82 -
cee9a4...
Finding most changed files in Git
...be much slower, but will work for that purpose.
git ls-files |
while read aa
do
printf . >&2
set $(git log --follow --oneline "$aa" | wc)
printf '%s\t%s\n' $1 "$aa"
done > bb
echo
sort -nr bb
rm bb
git-most.sh
...
CMake link to external library
...n PBXBuildFile section \*\/#\/\* Begin PBXBuildFile section \*\/\
26B12AA11C10544700A9A2BA \/\* GameKit.framework in Frameworks \*\/ = {isa = PBXBuildFile; fileRef = 26B12AA01C10544700A9A2BA \/\* GameKit.framework xxx\*\/; };#g
s#\/\* Begin PBXFileReference section \*\/#\/\* Begin PBXFileRefere...
Can virtual functions have default parameters?
..."\n"; }
};
int main()
{
A * a = new B();
a->display();
A* aa = new A();
aa->display();
B* bb = new B();
bb->display();
}
Which produces the following output:
Derived::5
Base::5
Derived::9
With the aid of the explanation above, it is easy to see why. At compil...
Replacing NAs with latest non-NA value
...,NA,NA))
[1] 1 1 1 1 3 4 5 5 5 5 5 5 5 5
> replace_na_with_last(c(NA,"aa",NA,"ccc",NA))
[1] "aa" "aa" "aa" "ccc" "ccc"
speed is reasonable too:
> system.time(replace_na_with_last(sample(c(1,2,3,NA),1e6,replace=TRUE)))
user system elapsed
0.072 0.000 0.071
...
Convert hex string to int
...y too big for an int (which is 4 bytes and signed).
Use
Long.parseLong("AA0F245C", 16);
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Flatten nested dictionaries, compressing keys
...> testData = {
'a':1,
'b':2,
'c':{
'aa':11,
'bb':22,
'cc':{
'aaa':111
}
}
}
from pprint import pprint as pp
>>> pp(dict( flattenDict(testData, lift=lambda x:(x,)) ))
{('a',): 1,
('b',): ...
Occurrences of substring in a string
...e that this might or might not return the result expected. With substring "aa" and string to search "aaa" the number of occurences expected may be one (returned by this code), but may be two as well (in this case you'll need "lastIndex++" instead of "lastIndex += findStr.length()") depending on what...