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大量に出力されても、cronで指定したタイミングでしか送信しないので安心。

#使い方

crontab
* * * * * /bin/sh /root/watch.sh /var/log/messages 【通知先メールアドレス】>> /tmp/watch.log

#スクリプト

watch.sh
#!/bin/sh
TARGET=$1
MAILTO=$2

BASE="$(basename $0)"
TFILE="/tmp/$BASE.tail"
PFILE="/tmp/$BASE.prev"
DFILE="/tmp/$BASE.diff"
LFILE="/tmp/$BASE.log"

tail $TARGET > $TFILE
if (diff $PFILE $TFILE | grep '^>' > $DFILE); then
   SUBJECT="`hostname -s` watch ${TARGET}"
   cat $DFILE | mail -s "$SUBJECT" $MAILTO
else
   date >> $LFILE
fi

mv $TFILE $PFILE

補足

いちいち報告しなくて良い項目は、diff -X で指定する除外ファイルを作ってやると良し

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