awk - how to select multiple line in log -

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i try make file. has error message in particular log file.

this log contents.

[error] 2015-08-05 14:20:10 handlerexceptionresolver - org.springframework.jdbc.badsqlgrammarexception: ..... ..e(sqlerrorcodesqlexceptiontranslator.java:231) ..ractfallbacksqlexceptiontranslator.java:73) ..possible(mybatisexceptiontranslator.java:73) ..interceptor.invoke(sqlsessiontemplate.java:371) ..electone(unknown source) ..emplate.selectone(sqlsessiontemplate.java:163) [info] 2015-08-05 14:20:39 logginginterceptor -  /products/430

and try it

awk '$1 ~/^\[error\]$/{print$0}' original.log > extract.log

but result 1 line.

[error] 2015-08-05 14:20:10 handlerexceptionresolver -

my expected is..

[error] 2015-08-05 14:20:10 handlerexceptionresolver - org.springframework.jdbc.badsqlgrammarexception: ..... ..e(sqlerrorcodesqlexceptiontranslator.java:231) ..ractfallbacksqlexceptiontranslator.java:73) ..possible(mybatisexceptiontranslator.java:73) ..interceptor.invoke(sqlsessiontemplate.java:371) ..electone(unknown source) ..emplate.selectone(sqlsessiontemplate.java:163)

i want know how extract error message.

one idea turn printing off , on depending on level want print:

$ cat log.awk /^\[[a-z]+\]/ { flag = 0 } /^\[error\]/ { flag = 1 } flag  $ cat log.txt [error] 2015-08-05 14:20:10 handlerexceptionresolver -enter code here org.springframework.jdbc.badsqlgrammarexception:enter code here .....enter code here ..e(sqlerrorcodesqlexceptiontranslator.java:231)enter code here ..ractfallbacksqlexceptiontranslator.java:73)enter code here ..possible(mybatisexceptiontranslator.java:73)enter code here ..interceptor.invoke(sqlsessiontemplate.java:371)enter code ..electone(unknown source)enter code here ..emplate.selectone(sqlsessiontemplate.java:163)enter code here [info] 2015-08-05 14:20:39 logginginterceptor - /products/430 [error] other multiline error [warn] warning not error  $ awk -f log.awk log.txt [error] 2015-08-05 14:20:10 handlerexceptionresolver -enter code here org.springframework.jdbc.badsqlgrammarexception:enter code here .....enter code here ..e(sqlerrorcodesqlexceptiontranslator.java:231)enter code here ..ractfallbacksqlexceptiontranslator.java:73)enter code here ..possible(mybatisexceptiontranslator.java:73)enter code here ..interceptor.invoke(sqlsessiontemplate.java:371)enter code ..electone(unknown source)enter code here ..emplate.selectone(sqlsessiontemplate.java:163)enter code here [error] other multiline error

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