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Maven artifact and groupId naming
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How can I remove the first line of a text file using bash/sed script?
...istopherSahnwaldt -- tail is much, much slower than the sed variant, by an order of magnitude. I'm testing it on a file of 500,000K lines (no more than 50 chars per line). However, I then realized I was using the FreeBSD version of tail (which comes with OS X by default). When I switched to GNU tail...
Android “Only the original thread that created a view hierarchy can touch its views.”
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Thank you, it's really sad to create a thread in order to go back to the UI Thread but only this solution saved my case.
– Pierre Maoui
May 4 '15 at 17:16
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How to listen for changes to a MongoDB collection?
...ase-notes/3.6/ 2018/01/10
$ mongod --version
db version v3.6.2
In order to use changeStreams the database must be a Replication Set
More about Replication Sets:
https://docs.mongodb.com/manual/replication/
Your Database will be a "Standalone" by default.
How to Convert...
LEN function not including trailing spaces in SQL Server
...LACE(@s,' ','x'). That technique gives the correct answer, but is a couple orders of magnitude slower than the other techniques when the string is large.
Given the problems introduced by surrogate pairs on any technique that uses DATALENGTH, I think the safest method that gives correct answers that...
MySQL: Selecting multiple fields into multiple variables in a stored procedure
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Your syntax isn't quite right: you need to list the fields in order before the INTO, and the corresponding target variables after:
SELECT Id, dateCreated
INTO iId, dCreate
FROM products
WHERE pName = iName
sha...
How to read a file into a variable in shell?
... all.
My approach now uses read along with the printf builtin's -v flag in order to read the contents of stdin directly into a variable.
# Reads stdin into a variable, accounting for trailing newlines. Avoids
# needing a subshell or command substitution.
# Note that NUL bytes are still unsupported, ...
What's the best way to retry an AJAX request on failure using jQuery?
...der is making sure the $.ajax method wasn't already wrapped previously, in order to avoid the same code running twice.
You can copy-paste these snippets (as-is) to the console to test them
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How to make “if not true condition”?
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Here is an answer by way of example:
In order to make sure data loggers are online a cron script runs every 15 minutes that looks like this:
#!/bin/bash
#
if ! ping -c 1 SOLAR &>/dev/null
then
echo "SUBJECT: SOLAR is not responding to ping" | ssmtp abc@d...
Learning WebGL and three.js [closed]
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For a first 3d project, experts suggest using a library like Three.js in order to get used to the terms and the general 3d model.
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