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Why should text files end with a newline?
... hard advantage to this guideline when working on a terminal emulator: All Unix tools expect this convention and work with it. For instance, when concatenating files with cat, a file terminated by newline will have a different effect than one without:
$ more a.txt
foo
$ more b.txt
bar$ more c.txt
b...
What does -D_XOPEN_SOURCE do/mean?
...s.
This will give you some extra functionality that exists on most recent UNIX/BSD/Linux systems, but probably doesn't exist on other systems such as Windows.
The numbers refer to different versions of the standard.
500 - X/Open 5, incorporating POSIX 1995
600 - X/Open 6, incorporating POSIX 200...
How do I clear the terminal screen in Haskell?
...a terminal that understands ANSI escape sequences (I believe every term in Unix/Linux systems) you can do it simply with:
clear = putStr "\ESC[2J"
The 2 clears the entire screen. You can use 0 or 1 respectively if you want to clear from the cursor to end of screen or from cursor to the beginning ...
Including all the jars in a directory within the Java classpath
...Use *, not *.jar
Windows
java -cp "Test.jar;lib/*" my.package.MainClass
Unix
java -cp "Test.jar:lib/*" my.package.MainClass
This is similar to Windows, but uses : instead of ;. If you cannot use wildcards, bash allows the following syntax (where lib is the directory containing all the Java arch...
Powershell equivalent of bash ampersand (&) for forking/running background processes
... Glad I found this answer. I was looking for the equivalent of a Unix fork-twice mechanism. To me it seems that something started with Start-Job will be killed when the PS shell exits. In contrast it seems that something started with Start-Process will continue to run after the PS shell ex...
Difference between Python datetime vs time modules
...
the time module is principally for working with unix time stamps; expressed as a floating point number taken to be seconds since the unix epoch. the datetime module can support many of the same operations, but provides a more object oriented set of types, and also has som...
How to add NERDTree to your .vimrc
...
Are you on a Windows or unix-y system?
If you're on a unix-y system you put plugins in ~/.vim/plugin. Here's what my plugin directory looks like:
$ ls ~/.vim/plugin
NERD_tree.vim scratch.vim scratchfind.vim
After that it starts working right a...
How to create a file in a directory in java?
....separator + "hello" + File.separator + "hi.txt";
// Use relative path for Unix systems
File f = new File(path);
f.getParentFile().mkdirs();
f.createNewFile();
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Find lines from a file which are not present in another file [duplicate]
...<(sort -u file2)
Solution 2: (the first "working" answer I found) from unix.stackexchange:
fgrep -v -f file1 file2
Note that if file2 contains duplicate lines that don't exist at all in file1, fgrep will output each of the duplicate lines. Also note that my totally non-scientific tests on a si...
How to get the current time in Python
...me in "seconds since the epoch" as well as other utilities.
import time
Unix Epoch Time
This is the format you should get timestamps in for saving in databases. It is a simple floating point number that can be converted to an integer. It is also good for arithmetic in seconds, as it represents t...