file

A Bourne shell script that loops through all files

Linux shell script for loop FAQ: Can you share an example of a Linux shell script for loop, for instance, to do something for every file in the current directory?

Here's a shell script that you'll find on all the Unix, Linux, and Mac OS X computers I've worked on. The general process of this script is "for every file in the current directory do XYZ".

By Alvin Alexander on May 3, 2013

Nagios error code 127, make sure your plugin actually exists

Nagios FAQ: I'm trying to get Nagios to work, but when it starts running there is an error message in the log file that says something like "Nagios, Error Code 127, Make sure the plugin you're trying to run actually exists". How I can fix this?

By Alvin Alexander on August 6, 2011

How to use the Commons IO project to create, delete, and move files and directories

I wrote the following Java class today that is a "helper" class for a project I'm working on to create a web interface for Nagios. The Nagios part isn't too relevant, because mostly what I'm trying to show here is how to use the Apache Commons IO project to make it easier to interact with files and directories from Java code.

In short, the following Java class shows how to use the Commons IO project to accomplish the following tasks. Without any further delay, here is the complete source code for my class:

By Alvin Alexander on October 17, 2012

Ant WAR task - A sample Ant build script that builds a WAR file

You'll probably have to know a little bit about Java, Ant, and build files for this sample build.xml file to be any use to you, but if you're looking for a sample Ant build script that can be used to create a war file, or one that simple uses a war task, this example might work for you.

I'm not going to provide any explanation of any of this right now, but if I have time in the future I'll come back here and add a few comments about how this build script works.

By Alvin Alexander on October 17, 2012

Sample Cobertura ant build script

Summary: A Sample Cobertura Ant build script.

I still haven't gotten around to writing a Cobertura code-coverage tutorial, but in lieu of that, I thought I'd include an ant build script here that does a lot of powerful things, including a task that generates Cobertura code-coverage reports.

By Alvin Alexander on October 17, 2012

Shell script error - bad interpreter - No such file or directory

Some times when you take a file from a DOS/Windows system and move it to a Linux or Unix system you'll have problems with the dreaded ^M character. This happened recently when I moved an Ant script from a Windows system to my Mac OS X system. When I tried to run the shell script under the Mac Terminal I got this error message:

: bad interpreter: No such file or directory

I couldn't figure out what the message meant at first, but finally it hit me: the dreaded ^M problem. Sure enough, I opened the file in the vim editor, like this:

By Alvin Alexander on April 10, 2011

Java File IO - How to test whether a file or directory exists

Java File I/O FAQ: Using Java, how can you test to see if a file or directory exists?

Java test to see if a file or directory exists

Answer: Here's a sample Java method that shows this test. All you have to do is use the exists() method of the File class (java.io.File) to perform this test.

By Alvin Alexander on October 17, 2012

Copy files on Mac OS X using drag-and-drop

Mac drag and drop FAQ: How do I copy files on a Mac OS X system using drag and drop between one or more Mac Finder windows?

It turns out that when you drag and drop a file between two Finder windows on the same Mac OS X filesystem you end up moving the file. Unfortunately that's not usually what I want to do; usually I want to copy the file, which recently begged the question "How do I copy files when using drag and drop?"

By Alvin Alexander on February 7, 2013

Finding files that Spotlight is missing

I generally use Spotlight when searching my Mac for a file, but there are times it doesn't work, especially when I'm trying to find a file that contains a phrase I know. For instance, I may have a file named "Fred.txt", and it contains the phrase "foo bar", but when I open Spotlight and type in "foo bar", the file Fred.txt never shows up.

By Alvin Alexander on October 20, 2012

Linux find command man page

The contents of this page come from the CentOS Linux find man page, i.e., the man page for the Linux find command (also known as the help page for the find command).

By Alvin Alexander on October 24, 2012
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