在 HP-UX 框中比较日期的语法 - 未找到错误

Question

这是关于在 HP-UX 机器上检查 SSL 证书过期的问题。没有可用的日期 -d。

我有以下内容；

#!/bin/bash 

# Exit script if program fails or an unset variable is used
    set -eu 

server="BLABLA"
port="443"
graceperiod_days="30" 

# Get expiry date of SSL certificate, in format 'Jan 31 11:59:00 2018 GMT'
enddate="$(openssl s_client -connect "$server:$port" 2>/dev/null | openssl x509 -noout -enddate | sed -e 's#notAfter=##')" 

# Get today's date in format DD-MM-YYYY
todaysdate="$(date "+%d-%m-%Y")"
    echo "Today's date is $todaysdate" 

# Convert $enddate to format DD-MM-YYYY
enddate_formatted=$(printf '%s\n' "$enddate" | awk '{printf "%02d-%02d-%04d\n",$2,(index("JanFebMarAprMayJunJulAugSepOctNovDec",$1)+2)/3,$4}')
    echo "Certificate expiry date is $enddate_formatted" 

# Compare expiry date with today's date
if "$todaysdate" -ge "$("$enddate_formatted" - "$graceperiod_days")"
    then echo "$todaysdate is greater than $enddate_formatted. SSL certificate has expired!"
elif "$todaysdate" -lt "$("$enddate_formatted" - "$graceperiod_days")"
    then echo "$todaysdate is before $enddate_formatted. Everything is OK!"
else
    echo "ERROR"; fi 

据我所知，这应该可以，但是输出是；

Today's date is 29-08-2018
Certificate expiry date is 21-07-2018
./test[22]: 21-07-2018:  not found.
./test[22]: 29-08-2018:  not found.
./test[24]: 21-07-2018:  not found.
./test[24]: 29-08-2018:  not found.
ERROR 

怎么了？

Answer 1

首先，您需要一种可以对其进行算术运算的形式的日期：

todaysdate_seconds=$(date +%s --date "$todaysdate")  # assuming GNU date
gp_seconds=$((graceperiod_days * 86400))
enddate_seconds=$(date +%s --date "$enddate_formatted")

其次，您的if 语句缺少可以检查其退出状态的命令。你所拥有的只是这样一个命令的参数。相反，使用

if test "$todaysdate_seconds" -ge "$("$enddate_seconds" - "$gp_seconds")"; then

或者更简单的bash算术命令

if (( todaysdate_seconds >= enddate_seconds - gp_seconds )); then