Grep lines before a pattern having some other pattern
Hi All,
I am trying to fetch lines before a pattern, I got to know about -B flag in grep but we have to pass the number to get those lines before some pattern say (X), now what if I want to get line/s with some other pattern say (Y) before X pattern? How to get about it? please help.
Input: test.xml
Code:
<EXTENSION NAME ="File Writer" SESSNAME ="NATIONAL_ARCHIVES" SUBTYPE ="File Writer" STAGETYPE ="Target Definition" TYPE ="WRITER">
<CONNREF CNXREFNAME ="CONN" CONNNAME ="" CONNNUMBER ="1" CONNSUBTYPE ="" CONNTYPE ="" VARIABLE =""/>
<ELEMENT NAME ="Merge Type" VALUE ="No Merge"/>
<ELEMENT NAME ="Merge File Directory" VALUE ="$DestFileDir"/>
<ELEMENT NAME ="Merge File Name" VALUE ="national_archives.out"/>
<ELEMENT NAME ="Append if Exists" VALUE ="NO"/>
<ELEMENT NAME ="Create Target Directory" VALUE ="NO"/>
<ELEMENT NAME ="Header Options" VALUE ="No Header"/>
<ELEMENT NAME ="Header Command" VALUE =""/>
<ELEMENT NAME ="Footer Command" VALUE =""/>
<ELEMENT NAME ="Output Type" VALUE ="File"/>
<ELEMENT NAME ="Merge Command" VALUE =""/>
</SESSNAME>
<SESSNAME NAME ="Relational Lookup" SINSTANCENAME ="LKP_CUSTOMER_EQUIPMENT_DTL_FACT" SUBTYPE ="Relational Lookup" STAGETYPE ="Lookup Procedure" TYPE ="LOOKUPEXTENSION">
<CONNREF CNXREFNAME ="DB CONN" CONNNAME ="XXX@YYY" CONNNUMBER ="1" CONNSUBTYPE ="Oracle" CONNTYPE ="Relational" VARIABLE =""/>
</SESSNAME>
<SESSNAME NAME ="Relational Reader" SINSTANCENAME ="SQ_EMPLOYEE" SUBTYPE ="Relational Reader" STAGETYPE ="Source Qualifier" TYPE ="READER">
<CONNREF CNXREFNAME ="DB CONN" CONNNAME ="YYY@XXX" CONNNUMBER ="1" CONNSUBTYPE ="Oracle" CONNTYPE ="Relational" VARIABLE =""/>
</SESSNAME>
<SESSNAME DDQINSTNAME ="SQ_EMPLOYEE" DSQINSTTYPE ="Source Qualifier" NAME ="Relational Reader" SINSTANCENAME ="EMPLOYEE" SUBTYPE ="Relational Reader" STAGETYPE ="Source Definition" TYPE ="READER"/>
<ELEMENT NAME ="General Options" VALUE =""/>
<ELEMENT NAME ="Write Backward Compatible Session Log File" VALUE ="NO"/>
<ELEMENT NAME ="Session Log File Name" VALUE ="employee.log"/>
<ELEMENT NAME ="Session Log File directory" VALUE ="$SessLogDir"/>
</SESSION>
<SESSION DESCRIPTION ="This session will load data into EMPLOYEE table." ISVALID ="YES" MAPNAME ="employee_job" NAME ="sess_employee_job" REUSABLE ="YES" SORTORDER ="Binary" VERSIONNUMBER ="8">
<SESSTRANSFORMATIONINST ISREPARTITIONPOINT ="NO" PIPELINE ="1" SINSTANCENAME ="LKP_DEPARTMENT" STAGE ="2" TRANSFORMATIONNAME ="LKP_DEPARTMENT" STAGETYPE ="Lookup Procedure">
<PARTITION DESCRIPTION ="" NAME ="Partition #1"/>
<ELEMENT NAME ="CONN Information" VALUE ="DATA@DB"/>
</SESSTRANSFORMATIONINST>
<SESSTRANSFORMATIONINST ISREPARTITIONPOINT ="NO" PIPELINE ="1" SINSTANCENAME ="FLT_DEPT_NAMES" STAGE ="2" TRANSFORMATIONNAME ="FLT_DEPT_NAMES" STAGETYPE ="Filter">
<PARTITION DESCRIPTION ="" NAME ="Partition #1"/>
</SESSTRANSFORMATIONINST>
<SESSTRANSFORMATIONINST ISREPARTITIONPOINT ="NO" PIPELINE ="0" SINSTANCENAME ="DEPARTMENT_DIM" STAGE ="0" TRANSFORMATIONNAME ="DEPARTMENT_DIM" STAGETYPE ="Source Definition"/>
<SESSTRANSFORMATIONINST ISREPARTITIONPOINT ="YES" PARTITIONTYPE ="PASS THROUGH" PIPELINE ="1" SINSTANCENAME ="SQ_STATE_DIM" STAGE ="2" TRANSFORMATIONNAME ="SQ_STATE_DIM" STAGETYPE ="Source Qualifier"/>
<SESSTRANSFORMATIONINST ISREPARTITIONPOINT ="YES" PARTITIONTYPE ="PASS THROUGH" PIPELINE ="1" SINSTANCENAME ="TEST_file" STAGE ="3" TRANSFORMATIONNAME ="TEST_file" STAGETYPE ="Target Definition">
<FLATFILE CODEPAGE ="MS1252" CONSECDELIMITERSASONE ="NO" DELIMITED ="YES" DELIMITERS ="," ESCAPE_CHARACTER ="" KEEPESCAPECHAR ="NO" LINESEQUENTIAL ="NO" MULTIDELIMITERSASAND ="NO" NULLCHARTYPE ="ASCII" NULL_CHARACTER ="*" PADBYTES ="1" QUOTE_CHARACTER ="NONE" REPEATABLE ="NO" ROWDELIMITER ="0" SKIPROWS ="0" STRIPTRAILINGBLANKS ="NO"/>
<ELEMENT NAME ="Thread Record" VALUE ="RMS"/>
</SESSTRANSFORMATIONINST>
<SESSION DESCRIPTION ="" ISVALID ="YES" MAPNAME ="test_job" NAME ="sess_test_job" REUSABLE ="NO" SORTORDER ="Binary" VERSIONNUMBER ="2">
<SESSTRANSFORMATIONINST ISREPARTITIONPOINT ="YES" PARTITIONTYPE ="PASS THROUGH" PIPELINE ="2" SINSTANCENAME ="TEST1" STAGE ="4" TRANSFORMATIONNAME ="TEST1" STAGETYPE ="Target Definition">
<ELEMENT NAME ="Target Table Name" VALUE ="TEST2"/>
</SESSTRANSFORMATIONINST>
<SESSTRANSFORMATIONINST ISREPARTITIONPOINT ="NO" PIPELINE ="0" SINSTANCENAME ="TEST" STAGE ="0" TRANSFORMATIONNAME ="AGG_TEST" STAGETYPE ="Source Definition">
<ELEMENT NAME ="Source Table Name" VALUE ="AGG_TEST2"/>
</SESSTRANSFORMATIONINST>
<SESSION DESCRIPTION ="This session will load data into EMPLOYEE table." ISVALID ="YES" MAPNAME ="employee_job" NAME ="sess_employee_job" REUSABLE ="YES" SORTORDER ="Binary" VERSIONNUMBER ="8">
<SESSION DESCRIPTION ="" ISVALID ="YES" MAPNAME ="test_job" NAME ="sess_test_job" REUSABLE ="NO" SORTORDER ="Binary" VERSIONNUMBER ="2">
But the problem I am facing is that I don't know where "SESSION DESCRIPTION" will be present? will it be at the 15th line, 10th line above the "Thread" pattern? Also I've to capture the first "SESSION DESCRIPTION" pattern when multiple are present. So how to decide the NUM for -B or is there a way to capture the first pattern encountered before the line grep-ed?
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02-05-2015
