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How to use double or single brackets, parentheses, curly braces
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Also for completeness, I just came across this in an old script: $[expression] ; this is the old, deprecated arithmetic expression syntax for the newer, preferred syntax: $((expression))
– michael
Oct 6 '12 at 7:53
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When should we use mutex and when should we use semaphore
...ut your thread is not allowed to sleep.
e.g.: An interrupt handler within OS kernel must never sleep. If it does the system will freeze / crash. If you need to insert a node to globally shared linked list from the interrupt handler, acquire a spinlock - insert node - release spinlock.
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Getting the last argument passed to a shell script
$1 is the first argument.
$@ is all of them.
27 Answers
27
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Run java jar file on a server as background process
...in order to communicate between two applications. I have written two shell scripts to run it, but once I start up that script I can't shut down / terminate the process. If I press ctrl + C or close the console, the server will shut down. Could anyone help me how to modify this script to run as a n...
Catching error codes in a shell pipe
I currently have a script that does something like
4 Answers
4
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Sending emails with Javascript
...;button onclick="sendMail(); return false">Send</button>
The Javascript:
function sendMail() {
var link = "mailto:me@example.com"
+ "?cc=myCCaddress@example.com"
+ "&subject=" + encodeURIComponent("This is my subject")
+ "&body=" + encodeU...
Reading output of a command into an array in Bash
I need to read the output of a command in my script into an array. The command is, for example:
3 Answers
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IF… OR IF… in a windows batch file
...ith nearly identical answers to Using an OR in an IF statement WinXP Batch Script
Final addendum - I almost forgot my favorite technique to test if a variable is any one of a list of case insensitive values. Initialize a test variable containing a delimitted list of acceptable values, and then use s...
How to change Rails 3 server default port in develoment?
... projects, and you will have a lot problems later...
In your project edit script/rails this way:
#!/usr/bin/env ruby
# This command will automatically be run when you run "rails" with Rails 3 gems installed from the root of your application.
APP_PATH = File.expand_path('../../config/application',...
Unzip a file with php
...d.
Finally, be very careful about accepting whatever input is passed to a script via a $_GET variable.
ALWAYS SANITIZE USER INPUT.
UPDATE
As per your comment, the best way to extract the zip file into the same directory in which it resides is to determine the hard path to the file and extract ...