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Getting the count of unique values in a column in bash
... see a frequency count for column two (for example):
awk -F '\t' '{print $2}' * | sort | uniq -c | sort -nr
fileA.txt
z z a
a b c
w d e
fileB.txt
t r e
z d a
a g c
fileC.txt
z r a
v d c
a m c
Result:
3 d
2 r
1 z
1 m
1 g
1...
Generate random password string with requirements in javascript
...k?
Math.random() // Generate random number, eg: 0.123456
.toString(36) // Convert to base-36 : "0.4fzyo82mvyr"
.slice(-8);// Cut off last 8 characters : "yo82mvyr"
Documentation for the Number.prototype.toString and string.p...
How do you get the width and height of a multi-dimensional array?
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247
You use Array.GetLength with the index of the dimension you wish to retrieve.
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How to Sign an Already Compiled Apk
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293
create a key using
keytool -genkey -v -keystore my-release-key.keystore -alias alias_name -k...
MQTT物联网协议完全实践指南 · App Inventor 2 中文网
... 各版本对比 App上架指南 入门必读 IoT专题 AI2拓展 Aia Store 关于 关于我们 发布日志 服务条款 搜索 ...
Painless way to install a new version of R?
... |
edited May 8 '19 at 2:46
Gregor Thomas
91.9k1515 gold badges126126 silver badges235235 bronze badges
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What is Java String interning?
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242
http://docs.oracle.com/javase/7/docs/api/java/lang/String.html#intern()
Basically doing Strin...
How to determine if binary tree is balanced?
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27 Answers
27
Active
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In C/C++ what's the simplest way to reverse the order of bits in a byte?
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Checkout old commit and make it a new commit [duplicate]
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221
git rm -r .
git checkout HEAD~3 .
git commit
After the commit, files in the new HEAD will be...