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Check to see if python script is running
...hen the function exits
get_lock._lock_socket = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
try:
# The null byte (\0) means the socket is created
# in the abstract namespace instead of being created
# on the file system itself.
# Works only in Linux
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Execution time of C program
... "everywhere". There are system-specific functions, such as getrusage() on Unix-like systems.
Java's System.currentTimeMillis() does not measure the same thing. It is a "wall clock": it can help you measure how much time it took for the program to execute, but it does not tell you how much CPU time...
Is there a way for non-root processes to bind to “privileged” ports on Linux?
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Back in the day, port < 1024 was used in UNIX to UNIX protocols to prove the code running on the other end was running as root. This functioned reasonably well for a set of UNIX servers with common security.
– Joshua
Feb 2 '14 ...
Why do you need ./ (dot-slash) before executable or script name to run it in bash?
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Because on Unix, usually, the current directory is not in $PATH.
When you type a command the shell looks up a list of directories, as specified by the PATH variable. The current directory is not in that list.
The reason for not having...
What are the differences between Perl, Python, AWK and sed? [closed]
...ges of lines) of the input file or files. Its language is based on ed, the Unix editor, and although it has conditionals and so on, it is hard to work with for complex tasks. You can work minor miracles with it - but at a cost to the hair on your head. However, it is probably the fastest of the prog...
Text editor to open big (giant, huge, large) text files [closed]
...rams (no installation required):
less (macOS, Linux) – The traditional Unix command-line pager tool. Lets you view text files of practically any size. Can be installed on Windows, too.
Notepad (Windows) – Decent with large files, especially with word wrap turned off.
MORE (Windows) – This re...
Getting “unixtime” in Java
Date.getTime() returns milliseconds since Jan 1, 1970. Unixtime is seconds since Jan 1, 1970. I don't usually code in java, but I'm working on some bug fixes. I have:
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ListCtrl 重绘（Custom Draw） - C/C++ - 清泛网 - 专注C/C++及内核技术
...码就可以达到很好的效果。使用 Custom draw 来对控件外观编程甚至可以代替很多的古老方法。
以下代码是在WIN98 和VC6 SP2的环境下写的，common controls DLL的版本是5.0。我已经对其在WinNT 4上进行了测试。系统要运行这些代码，它的com...
What is the difference between a directory and a folder?
...omputer. The distinction can be due to the way a directory is accessed; on Unix systems, /usr/bin/ is usually referred to as a directory when viewed in a command line console, but if accessed through a graphical file manager, users may sometimes call it a folder.
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How can I pretty-print JSON in a shell script?
Is there a (Unix) shell script to format JSON in human-readable form?
55 Answers
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