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How can I quickly sum all numbers in a file?
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Your awk script should execute a bit faster if you use $0 instead of $1 since awk does field splitting (which obviously takes time) if any field is specifically mentioned in the script but doesn't otherwise.
– Ed...
Detecting Windows or Linux? [duplicate]
...he commons lang has a class SystemUtils.java
you can use :
SystemUtils.IS_OS_LINUX
SystemUtils.IS_OS_WINDOWS
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How do I debug Node.js applications?
... as part of the Google Chrome Developer Tools can be used to debug Node.js scripts. A detailed explanation of how this works can be found in the Node.js GitHub wiki.
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Deleting all files in a directory with Python
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Via os.listdir and os.remove:
import os
filelist = [ f for f in os.listdir(mydir) if f.endswith(".bak") ]
for f in filelist:
os.remove(os.path.join(mydir, f))
Or via glob.glob:
import glob, os, os.path
filelist = glob.g...
How to change Elasticsearch max memory size
...re referred to some previous distribution.
On Debian 8 modify the service script normally place in /usr/lib/systemd/system/elasticsearch.service, and add Environment=ES_HEAP_SIZE=8G
just below the other "Environment=*" lines.
Now reload the service script with systemctl daemon-reload and restart ...
How to redirect and append both stdout and stderr to a file with Bash?
...a file opened in append mode. In other words, the &1 reuses the file descriptor which stdout currently uses.
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How do I programmatically determine operating system in Java?
I would like to determine the operating system of the host that my Java program is running programmatically (for example: I would like to be able to load different properties based on whether I am on a Windows or Unix platform). What is the safest way to do this with 100% reliability?
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Copy file remotely with PowerShell
I am writing a PowerShell script that I want to run from Server A.
I want to connect to Server B and copy a file to Server A as a backup.
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Prevent “overscrolling” of web page
...iv>
<section id="inbox"><!-- msgs --></section>
<script>
let _startY;
const inbox = document.querySelector('#inbox');
inbox.addEventListener('touchstart', e => {
_startY = e.touches[0].pageY;
}, {passive: true});
inbox.addEventListener('touchmove', e =...
`from … import` vs `import .` [duplicate]
...urself when you import for simplicity or to avoid masking built ins:
from os import open as open_
# lets you use os.open without destroying the
# built in open() which returns file handles.
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