Want to extract certain lines from big file Post: 302965121

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Top Forums Shell Programming and Scripting Want to extract certain lines from big file Post 302965121 by Don Cragun on Sunday 24th of January 2016 04:08:06 AM

01-24-2016

Registered User

It sounds like I have wasted the last hour of my life trying to help you, but maybe this will help someone else. The following awk script only uses POSIX specified awk features and should work on any system (although you would need to change awk to /usr/xpg4/bin/awk or nawk if and only if you want to run this on a Solaris/SunOS system). It takes two files as inputs (which is what you said you had earlier). The first file (named trannums in this script) contains one or more lines with each line containing a transaction number to be extracted from your big file. The second file (named bigfile in this script) contains your big file containing transactions. It extracts each transaction listed in trannums into a separate output file with a name that is the string TX: followed by the transaction number:

Code:

#!/bin/ksh
awk -F '~' '
FNR == NR {
	# Gather transaction numbers...
	t[$1]
	tc = FNR
	next
}
{	# Gather transaction lines.
	l[++lc] = $0
}
$1 == "%%YEDTRN" && $2 in t {
	# We have found a transaction number for a transaction that is to be
	# extracted.  Save the transaction number and remove this transaction
	# from the remaining transaction list.
	remove t[transnum = $2]
	tc--
}
$1 == "0000EOT" {
	# If we have a transaction that is to be printed, print it.
	if(transnum) {
		# Print the transaction.
		for(i = 1; i <= lc; i++)
			print l[i] > ("TX:" transnum)
		close("TX:" transnum)
		printf("Transaction #%s extracted to file TX:%s\n", transnum,
		    transnum)
	}
	# Was this the last remaining transaction to be extracted?
	if(tc) {# No.  Reset for next transaction.
		lc = 0
		transnum = ""
	} else {# Yes.  Exit.
		exit
	}
}' trannums bigfile

Don Cragun

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LEARN ABOUT CENTOS

end

END(7)							  PostgreSQL 9.2.7 Documentation						    END(7)

NAME

       END - commit the current transaction

SYNOPSIS

       END [ WORK | TRANSACTION ]

DESCRIPTION

       END commits the current transaction. All changes made by the transaction become visible to others and are guaranteed to be durable if a
       crash occurs. This command is a PostgreSQL extension that is equivalent to COMMIT(7).

PARAMETERS

       WORK, TRANSACTION
	   Optional key words. They have no effect.

NOTES

       Use ROLLBACK(7) to abort a transaction.

       Issuing END when not inside a transaction does no harm, but it will provoke a warning message.

EXAMPLES

       To commit the current transaction and make all changes permanent:

	   END;

COMPATIBILITY

       END is a PostgreSQL extension that provides functionality equivalent to COMMIT(7), which is specified in the SQL standard.

SEE ALSO

       BEGIN(7), COMMIT(7), ROLLBACK(7)

PostgreSQL 9.2.7						    2014-02-17								    END(7)

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