CLI script for emailing alert if files missing in dir

Shell Programming and Scripting
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Is this a homework assignment? If so, please refile in the Homework & Coursework Questions forum following the directions specified here.

If not, what have you tried?

What operating system and shell are you using?

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Here is example to use ksh93 shell, which include builtin date calculation properties.

In other shell you can use ex. GNU date like:

from="20140226"
epoc=$(date --date="$from" +"%s")

#!/bin/ksh93

smail()
{

/usr/lib/sendmail -t -i <<EOF
From: myemail@some.com
To: alert@some.com
Subject: Missing

$*

Thats all.

-checker-

EOF
}

####MAIN###################
epocnow=$(printf "%(%#)T" now)
nowyyyymmddhh=$(printf "%(%Y%m%d%H)T" now)

datestr=$(printf "%(%Y-%m-%d %H:00)T" now)
epocnow2=$(printf "%(%#)T" "$datestr")
# length of day (seconds) = 86400
((hour=60*60))
((day=24*hour))

startstr="2015-02-23 00:00"
epoc=$(printf "%(%#)T" "$startstr")

print "$epocnow - $nowyyyymmddhh - $epocnow2 - $datestr :: $epoc"

mailstr=""
prev=""
lf=$'\x0a'
while (( epoc < epocnow ))
do
        file=$(printf "%(%Y%m%d/%H)T" "#$epoc")
        path=$(printf "%(%Y%m%d)T" "#$epoc")
        print "$path $file"
        [ ! -d "$path" -a "$path" != "$prev" ] && prev=$path && mailstr="$mailstr${lf}path missing $path"
        [ ! -f "$file" ] && mailstr="$mailstr${lf}-file missing $file"
        (( epoc+=hour ))
done

smail "$mailstr"
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