[TriLUG] Some script help

[Alan Porter via TriLUG]

> Bash is fine for this, but the key is to not try to compare dates. Bash doesn't do that well at all.

If you must compare dates in bash, let the date command convert them for 
you.

echo $((  (  $(date -d '2015-05-12' +%s)  -  $(date -d '2014-05-12' 
+%s)  )  / 86400  ))
365


Or if long lines are not your thing...

d1=$(date -d '2015-05-12' +%s)
d2=$(date -d '2014-05-12' +%s)
echo $(( ( $d1 -  $d2 ) / 86400 ))
365


Alan