Changes

Awk (view source)

811 bytes added , 11:18, 23 May 2016

adds recipes for grepping the line AFTER a matching pattern

# containing the regex

awk '/regex/{getline;print}'

# someone said somewhere that getline can pose problems.... dunno exactly what/why but here's an alternate

# This prints the 5th field of the line following the regex

# Then pipes it to grep with perl-compatible regex to use look-behind and look-ahead assertions to print the contents inside parenthesis

# so given an error log that contains the following two lines (repeatedly), and you want to extract the names of the tables

# Operation failed with exitcode 3

# 12:09:54 AM Dumping wordpress (log_civicrm_extension)

awk 'f{print $5;f=0} /Operation failed with exitcode/{f=1}' /tmp/mysqldump.error.log | sort | grep -P -o '(?<=$).*(?=$)'

## Admittedly this is more complex than just a couple greps!!

# grep -A1 /Operation failed with exitcode/ /tmp/mysqldump.error.log | sort | grep -P -o '(?<=$).*(?=$)'

# grep for AAA and BBB and CCC (in any order)

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