space char directly after var in bash
In bash space is used to determine the end of a variable , for example when you launchvar = abcd echo $var ef this will display abcd ef ,if you try to to display abcdef you can‘t do echo $varef the...
View ArticleTest the existence of a file in bash
If you need to test in a bash script if a file exist you can launch the following command. if [ -f /tmp/dnsmasq_leases.log ];then echo "The file exist" else echo "The file doesn't exist" fi Note if...
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Using a old intel cpu cooler on the raspberry pi 4.
The raspberry pi 4 has one of the fastest CPU on a SBC , but it doesn’t come with any cooler , The raspberry is indeed capable of running without a cooler , but if you do anything other than idling,...
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Using bash and gatttool to get readings from Xiaomi Mijia LYWSD03MMC...
There is a new inexpensive Temperature and humidity sensor by xiaomi.This time is no longer round , Xiaomi Mijia LYWSD03MMC Bluetooth 4.2 Temperature Humidity sensor if you like me would like to get...
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Orange Pi Zero 2 : A new Raspberry Pi contender ?
The new Orange Pi Zero 2 Single Board computer If you were searching for a very small and capable SBC to run some linux app on arm cpu , you were already able to buy the original Orange PI zero , but...
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Qingping ClearGrass CGDK2 factory reset
The Qingping Temp & RH Monitor Lite is a cool little BLE device to monitor the temperature inside your home , If you are like me , you don’t really like the mihome app and want to use Home...
View ArticleUsing the REST api to read sensors on Home assistant
During one of my little project of making timelapses videos with some IP cameras, I had the following problem : How do you stop capturing new images at night when the camera see nothing, After all ,...
View Articleffmpeg : Only keep one language audio track
When downloading movies from the internet, you may notice that some titles include the word “MULTI.” This indicates that the file contains multiple language options. However, despite the relatively...
View ArticleJSON text filtering with jq
I frequently have to intereact with some json files , since bash is the main tool i use day to day i must master the usage of jq, but i noticed that the vast majority of totorials on jq usage just...
View ArticleUsing VI to insert spaces at the begining of every line
In the Vi text editor, you can insert two spaces at the beginning of each line using a command called “substitution.” Here’s how you can do it: when in vi with your text displayed : Press the Esc key...
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