Other I/O

• "read" builtin to prompt user for variable (or to read one line from an input file)

  • Use with caution due to security implications

• "logger" to send syslog messages

• Send things to /bin/mail to output things to email

  • Simple log analysis script example: TODAY=`date "+%b %d"` COUNT = $( grep $TODAY /var/log/messages | grep “authentication failure” | wc -l ) if [ $COUNT -gt 4 ] then echo -e “There have been $COUNT authentication failures today. \nPlease investigate.” | /bin/mail -s “Security Alert from `hostname`” jeremy@
  • Note, requires properly configured mail susbystem

Notes: