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Get email date of yesterday

Context

I receive a daily bunch of messages from apticron telloing me the servers I need to upgrade.
I want to get the list of hostnames needing updates from the las two days.

Recipe

  • Get into the Maildir folder
  • Get to day and yesterday date
  • Grep the Messages for it
 cd /home/mihamina/Mail/ export TODAY=$(date +%Y%m%d) export TODAY_STRING=$(date +"%a, %d %b %Y") export YESTERDAY=$(($(date +%Y%m%d)-1)) export YESTERDAY_STRING=$(date +"%a, %d %b %Y" --date=$YESTERDAY)  (for MESS in $(grep -E "^Date: (${TODAY_STRING}|${YESTERDAY_STRING})" * \     | awk 'BEGIN{FS=":"}{print $1}');   do     grep -E "^Subject: " $MESS | awk 'BEGIN{FS=" on "}{print $2}';   done) | sort | uniq

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