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程序员之网络安全系列（二）：如何安全保存用户密码及哈希算法 - 更多技术 ...
...容？（保密性)
如何保证隔壁老王不修改情书的内容？（完整性)
如何保证隔壁老王不冒充明明？（身份认证)
如何保证明明不能否认情书是自己写的？（来源的不可否认)
通过了解hash算法,”明明” 就有办法让丽丽知道信...
Apply .gitignore on an existing repository already tracking large number of files
...
Create a .gitignore file, so to do that, you just create any blank .txt file.
Then you have to change its name writing the following line on the cmd (where git.txt is the name of the file you've just created):
rename git.txt .gitignore
Then you can open the file and write all the untracked ...
Sorting a tab delimited file
...
Using bash, this will do the trick:
$ sort -t$'\t' -k3 -nr file.txt
Notice the dollar sign in front of the single-quoted string. You can read about
it in the ANSI-C Quoting sections of the bash man page.
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What does “export” do in shell programming? [duplicate]
...the assignment visible to subprocesses.
jcomeau@intrepid:~/rentacoder/bin2txt$ foo=bar
jcomeau@intrepid:~/rentacoder/bin2txt$ bash -c 'echo $foo'
jcomeau@intrepid:~/rentacoder/bin2txt$ export foo
jcomeau@intrepid:~/rentacoder/bin2txt$ bash -c 'echo $foo'
bar
...
How to prevent line break at hyphens on all browsers
...some JS to replace them:
jQuery:
//replace hypens with no-breaking ones
$txt = $("#block-views-video-block h2");
$txt.text( $txt.text().replace(/-/g, '‑') );
Vanilla JS:
function nonBrHypens(id) {
var str = document.getElementById(id).innerHTML;
var txt = str.replace(/-/g, '‑');
...
How to combine two strings together in PHP?
...
You can do this using PHP:
$txt1 = "the color is";
$txt2 = " red!";
echo $txt1.$txt2;
This will combine two strings and the putput will be: "the color is red!".
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How to create a new file together with missing parent directories?
... with a path string which contains a parent directory, i.e. new File("file.txt").getParentFile() returns null, new File("dir/file.txt").getParentFile() returns the same as new File("dir")
– Zoltán
Nov 21 '14 at 9:38
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More lines in command window
...complement the answer(s) above, its also possible to export the lines to a txt file
using > fileName.txt
For example:
myProgram.exe > output.txt // will create a new file with all the output of myProgram
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Read file from line 2 or skip header row
...ction. Suppose you wanted to tokenize the first three lines of coordinates.txt to use as header information.
Example
coordinates.txt
---------------
Name,Longitude,Latitude,Elevation, Comments
String, Decimal Deg., Decimal Deg., Meters, String
Euler's Town,7.58857,47.559537,0, "Blah"
Faneuil Hall...
Useless use of cat?
...ookie tried to pin the UUOC on me for one of my answers. It was a cat file.txt | grep foo | cut ... | cut .... I gave him a piece of my mind, and only after doing so visited the link he gave me referring to the origins of the award and the practice of doing so. Further searching led me to this quest...