<s>[INST] Write me POSIX-shellscript to convert Celsius to Kelvin. [/INST] Yes sure, here is a simple shell script to convert Celsius to Kelvin!
```
#!/bin/sh

# Read temperature in Celsius
$celsius = 0

# Convert to Kelvin
kelvin=$(echo "$celsius - 273.15" | bc)
```
The code-snippet uses the simple conversion formula to create a new variable named "kelvin" which stores the kelvin value of the celcius value provided. You would have to provide the Celsius value to the code yourself, e.g. using the "read" function.</s>