I have a log file without date/time, and I want that everytime tail|grep find something it displays the date/time and the line. I have tried something like this command but without any luck to display the date/time:
tail -F catalina.out | sed "s/^/`date `/" | egrep 'Fatal|delimiter|structures'
It displays the date/time but the date/time when I executed the command, not when the match happened.
/apps/tomcat-pub/webapps/paudio/v1/WEB-INF/resources/xml/
bCaducat [false] bControlCarregaOk [true]
/apps/tomcat-pub/webapps/paudio/v1/WEB-INF/resources/xml/
Emissora CATCULTURA bControlPrioritariOk [false] bNowAndNextOk [true] bControlCarregaOk [true]
[Fatal Error] pritmes:347:209: The element type "xsl:template" must be terminated by the matching end-tag "</xsl:template>".
file:///apps/tomcat-pub/webapps/pritmes; Line #347; Column #209; org.xml.sax.SAXParseException: The element type "xsl:template" must be terminated by the ma
tching end-tag "</xsl:template>".
/apps/tomcat-pub/webapps/paudio/v1/WEB-INF/resources/xml/
bCaducat [false] bControlCarregaOk [true]
/apps/tomcat-pub/webapps/paudio/v1/WEB-INF/resources/xml/
Ok- then you tell us how to know when the line in the logfile was written. If the file was written out over a period of time the file mtime is LAST time it was written to - the time for the last line in the file - not the time a given line was written.
Without timestamps or some other file with timestamps you cannot get anything but a file mtime - or a ctime which in this case is pretty much useless.