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Test for non-zero length string in Bash: [ -n “$var” ] or [ “$var” ]
...s a more complete version that shows more differences between [ (aka test) and [[.
The following table shows that whether a variable is quoted or not, whether you use single or double brackets and whether the variable contains only a space are the things that affect whether using a test with or wit...
\r\n, \r and \n what is the difference between them? [duplicate]
I need to ask about the difference in a string between \r\n , \r and \n . How is a string affected by each?
4 Answers
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Restore a postgres backup file using the command line?
I'm new to postgresql, and locally, I use pgadmin3. On the remote server, however, I have no such luxury.
24 Answers
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Is there a `pointer-events:hoverOnly` or similar in CSS?
...ef="www.google.com">Link here</a>
Edit:
supported in IE 11 and above
http://caniuse.com/#search=pointer-events
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Secure hash and salt for PHP passwords
...nswer was written in 2008.
Since then, PHP has given us password_hash and password_verify and, since their introduction, they are the recommended password hashing & checking method.
The theory of the answer is still a good read though.
TL;DR
Don'ts
Don't limit what characters user...
How do I make a delay in Java?
I am trying to do something in Java and I need something to wait / delay for an amount of seconds in a while loop.
8 Answer...
How do I write a bash script to restart a process if it dies?
I have a python script that'll be checking a queue and performing an action on each item:
8 Answers
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How to write a Unit Test?
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Define the expected and desired output for a normal case, with correct input.
Now, implement the test by declaring a class, name it anything (Usually something like TestAddingModule), and add the testAdd method to it (i.e. like the one below) :...
Allow user to set up an SSH tunnel, but nothing else
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On Ubuntu 11.10, I found I could block ssh commands, sent with and without -T, and block scp copying, while allowing port forwarding to go through.
Specifically I have a redis-server on "somehost" bound to localhost:6379 that I wish to share securely via ssh tunnels to ...
How to go back (ctrl+z) in vi/vim
... to Vim] there is a shortcut Ctrl + Z when you have done something nasty and want to return to the previous version of the text. Like BACK button in Word. I wonder how can you achieve this behaviour in Vim.
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