大约有 40,000 项符合查询结果（耗时：0.1374秒） [XML]
How do I create a Bash alias?
...
You can add an alias or a function in your startup script file. Usually this is .bashrc, .bash_login or .profile file in your home directory.
Since these files are hidden you will have to do an ls -a to list them. If you don't have one you can create one.
If I remember c...
What are the differences between NP, NP-Complete and NP-Hard?
... the technical definitions require quite some time to understand. First of all, let's remember a preliminary needed concept to understand those definitions.
Decision problem: A problem with a yes or no answer.
Now, let us define those complexity classes.
P
P is a complexity class that repres...
Add primary key to existing table
...Id,Pname,PMID)
which yeilds randomized names and can cause problems when scripting out or comparing databases
share
|
improve this answer
|
follow
|
...
Use tab to indent in textarea
...
As others have written, you can use JavaScript to capture the event, prevent the default action (so that the cursor does not shift focus) and insert a tab character.
But, disabling the default behavior makes it impossible to move the focus out of the text area wit...
How to convert a PNG image to a SVG? [closed]
...le = 2017.pnm
potrace 2017.pnm -s -o 2017.svg
Output file = 2017.svg
Script
ykarikos proposes a script png2svg.sh that I have improved:
#!/bin/bash
File_png="${1?:Usage: $0 file.png}"
if [[ ! -s "$File_png" ]]; then
echo >&2 "The first argument ($File_png)"
echo >&2 "must...
Calling parent class __init__ with multiple inheritance, what's the right way?
...ing super() leads to greater flexibility for subclasses.
In the direct call approach, C.__init__ can call both A.__init__ and B.__init__.
When using super(), the classes need to be designed for cooperative multiple inheritance where C calls super, which invokes A's code which will also call supe...
Setting up a deployment / build / CI cycle for PHP projects
... hudson have no plugins, you can either call them directly through a shell script from within the build setup, or you could write you own plugin
Pitfalls:
If you have it produce build artefacts, remember to have hudson clean up after itself in regular intervals.
If you have more than 20 projects ...
Is there a better way to run a command N times in bash?
...rying to understand what I did, I'd probably wrap the confusion in a shell script and just call it with repeat.sh repeatcount some_command. For implementation in the shell script I might use parallel, if it was already installed on the machine (probably wouldn't be). Or I might gravitate towards xar...
orderBy multiple fields in Angular
...nce and toggles ascending/descending for the complete array list set:
<script>
app.controller('myCtrl', function ($scope) {
$scope.sortArray = ['name'];
$scope.sortReverse1 = false;
$scope.searchProperty1 = '';
$scope.addSort = function (x) {
if...
Split output of command by columns using Bash?
... be executed in an environment that does not pass variables to the calling script.
out=$(ps whatever | { read a b c d; echo $c; })
arr=($(ps whatever | { read a b c d; echo $c $b; }))
echo ${arr[1]} # will output 'b'`
The Array Solution
So we then end up with the answer by @frayser which is...