linux - Echo results from a grep search in shell script -

i have shell script searches authentication fails. example if given file contains following row:

mar 19 15:54:18 precise3 sshd[16516]: failed password lotte 127.0.0.1 port 47384 ssh2 

the shell script find , write results in separate file as:

date: date    username: username    client ip: ip-address 

now have script finds authentication fails, how can write data fail file? script is:

#!/bin/bash if egrep "sshd\[[0-9]+\]: failed password \w+ [0-9.]+ port [0-9]+ ssh2$" /var/log/auth.log     echo "date: date    username: username    client ip: ip-address" > /root/failedauth else     echo "no failed authentications found." fi 

using awk:

awk '/failed password/ {print "date: "$1" "$2" "$3"\tusername: "$9"\t\tclient ip: "$11 }' /var/log/auth.log >> /root/failedauth 

the above find failed auth attempts , log them in /root/failedauth - if want line echoed if there no results, like:

failures=$(awk '/failed password/ {print "date: "$1" "$2" "$3"\tusername: "$9"\t\tclient ip: "$11 }' /var/log/auth.log) test -n "$failures" && echo "$failures" >> /root/failedauth || echo "no failed auths found"