shell中expr計算變量的運算

 

#!/bin/bash

current_wk=$(date +%V)
#base_wk=44
base_version=12
current_year=$(date +%Y)
if [ ${current_year} = 2019 ];then
    version=`expr ${current_wk} - 44`
    echo "version:$version"
    current_version=`expr ${version} + 12`
    OUTVersion="S054C0${current_version}"
    echo "OUTVersion:$OUTVersion"
else
	current_version=`expr ${current_wk} + 20`
    OUTVersion="S054C0${current_version}"
    echo "OUTVersion:$OUTVersion"
fi