Originally published October 13, 2016 @ 12:48 am
Just a little bit of fun with Bash: a loan payment calculator. Nothing fancy here. Maybe I’ll add the amortization schedule to it later…
#!/bin/bash
principal=$(echo | sed -r 's/[,]//g')
apr=
life=
d() {
sed ':a;s/\B[0-9]\{3\}\>/,&/;ta'
}
if [ -z "${principal}" ] || [ -z "${apr}" ] || [ -z "${life}" ]
then
exit 1
fi
apr="$(echo "scale=6; ${apr} / (100*12)" | bc -q)"
payments=$(( ${life} * 12 ))
c="${principal} * ( ${apr} * ((1 + ${apr}) ^ ${payments} )) / ( ((1 + ${apr}) ^ ${payments}) - 1)"
payment="$(echo "scale=2; $${c}" | bc -q)"
interest="$(echo "scale=2; ${payment} * ${payments} - ${principal}" | bc -q)"
echo "You'll be making ${payments} monthly payments of $`echo ${payment} | d` to pay off $`echo ${principal} | d` at %, paying $`echo ${interest} | d` in interest"
Sample run:
(root:brocksamson)-(bg:0)-(~)# loancalc 30,000.00 4.75 5 You'll be making 60 monthly payments of $562.63 to pay off $30,000.00 at 4.75%, paying $3,757.80 in interest
Experienced Unix/Linux System Administrator with 20-year background in Systems Analysis, Problem Resolution and Engineering Application Support in a large distributed Unix and Windows server environment. Strong problem determination skills. Good knowledge of networking, remote diagnostic techniques, firewalls and network security. Extensive experience with engineering application and database servers, high-availability systems, high-performance computing clusters, and process automation.
