Unit Contribution Margin / Deckungsbeitrag

Unit Contribution Margin (C)
Unit Revenue (Price, P)
Unit Variable Cost (V)

C = P-V
C[%] = (P-V)/(P/100)

Deckungsbeitrag (DB)
Erlös, Umsatz (VK)
Variable Kosten (EK)

DB = VK-EK
DB[%] = (VK-EK)/(VK/100)

MySQL Dump Backup-Rotation

#!/bin/bash

TIME1=$(date +%d_%m_%Y__%H_%M_%S)
user=”root”
passwd=”xxxxxx”

# blabla db
db=”blabla”
mysqldump -c -f -Q –user=${user} –password=${passwd} –host=localhost ${db} | gzip -f > /root/backup/db_${db}.$TIME1.sql.gz
find /root/backup/db_${db}.*.sql.gz -mtime +3 -exec rm {} ;

compress/decompress tar.gz

compress:

tar -czvf archive.tgz files/

decompress:

tar -xzvf archive.tgz