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Check if a program exists from a Makefile
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Sometimes you need a Makefile to be able to run on different target OS's and you want the build to fail early if a required executable is not in PATH rather than to run for a possibly long time before failing.
The excellent solution provided by engineerchuan requires making a target. However, if ...
Setting the correct encoding when piping stdout in Python
...t of a Python program, the Python interpreter gets confused about encoding and sets it to None. This means a program like this:
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iOS开发调试技巧总结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
iOS开发调试技巧总结对于软件开发而言，调试是必须学会的技能，重要性不言而喻。对于调试的技能，基本上是可以迁移的，也就是说你以前在其他平台上掌握的很多调...对于软件开发而言，调试是必须学会的技能，重要性不言...
Allowed characters in Linux environment variable names
...llowed in Linux environment variable names? My cursory search of man pages and the web did only produce information about how to work with variables, but not which names are allowed.
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Sending email with PHP from an SMTP server
...l through a server that requires SMTP Auth, you really need to specify it, and set the host, username and password (and maybe the port if it is not the default one - 25).
For example, I usually use PHPMailer with similar settings to this ones:
$mail = new PHPMailer();
// Settings
$mail->IsSMTP...
Quickly create a large file on a Linux system
...her answers is a good solution, but it is slow for this purpose. In Linux (and other POSIX systems), we have fallocate, which uses the desired space without having to actually writing to it, works with most modern disk based file systems, very fast:
For example:
fallocate -l 10G gentoo_root.img
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Warning: push.default is unset; its implicit value is changing in Git 2.0
I've been using Git for a while now and have recently downloaded an update only to find this warning message come up when I try to push .
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Will docker container auto sync time with the host machine?
...are running Kitematic, which is now the suggested mechanism for getting up and running on Docker in OSX, you will have to periodically run this command:
docker-machine ssh default 'sudo ntpclient -s -h pool.ntp.org'
Or, for older versions of docker
docker-machine ssh dev 'sudo ntpclient -s -h po...
How to list the files inside a JAR file?
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Note that in Java 7, you can create a FileSystem from the JAR (zip) file, and then use NIO's directory walking and filtering mechanisms to search through it. This would make it easier to write code that handles JARs and "exploded" directories.
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How to check if a string contains an element from a list in Python
...hough my solution may be "good enough" solution to his particular problem, and is a good general way to check if any strings in a list are found in another string, keep in mind that this is all that this solution does. It does not care WHERE the string is found e.g. in the ending of the string. If t...