A Collection of Code Snippets in as Many Programming Languages as Possible

This project is maintained by TheRenegadeCoder

Welcome to the Prime Number in Bash page! Here, you'll find the source code for this program as well as a description of how the program works.

```
#!/bin/bash
ERROR="Usage: please input a non-negative integer"
# based on https://stackoverflow.com/questions/45392068/check-if-a-number-is-a-prime-in-bash
function is_prime(){
if [[ $1 -eq 2 ]] || [[ $1 -eq 3 ]]; then
return 1 # prime
fi
if [[ $(($1 % 2)) -eq 0 ]] || [[ $(($1 % 3)) -eq 0 ]] || [[ $1 -eq 1 ]]; then
return 0 # not a prime
fi
i=5; w=2
while [[ $((i * i)) -le $1 ]]; do
if [[ $(($1 % i)) -eq 0 ]]; then
return 0 # not a prime
fi
i=$((i + w))
w=$((6 - w))
done
return 1 # prime
}
# validate input number
if [[ -z "${1}" ]]
then
echo "${ERROR}"
exit 1
fi
if ! [[ "${1}" =~ ^[0-9]+$ ]]
then
echo "${ERROR}"
exit 1
fi
# sample usage
is_prime ${1}
if [[ $? -eq 0 ]];
then
echo "composite"
else
echo "prime"
fi
exit 0
```

Prime Number in Bash was written by:

- Jeremy Grifski
- thetbl

If you see anything you'd like to change or update, please consider contributing.

**Note**: The solution shown above is the current solution in the Sample Programs repository as of May 22 2021 15:02:49. The solution was first committed on Oct 14 2019 21:17:21. As a result, documentation below may be outdated.

No 'How to Implement the Solution' section available. Please consider contributing.

No 'How to Run the Solution' section available. Please consider contributing.