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Top Forums Shell Programming and Scripting awk to search similar strings and add their values Post 302589617 by balajesuri on Thursday 12th of January 2012 08:05:13 AM
Old 01-12-2012
Code:
nawk -F, '{OFS=","}{a[$1]+=$2}END{for(i in a){print i, a[i]}}' test.txt

OFS => Output Field Separator. This contains the character with which output fields would be separated. In this case, its defined as comma.
END => This block will be executed after all the lines in file 'test.txt' are processed.
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END(7)								   SQL Commands 							    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 [commit(7)]. PARAMETERS
WORK TRANSACTION Optional key words. They have no effect. NOTES
Use ROLLBACK [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 [commit(7)], which is specified in the SQL standard. SEE ALSO
BEGIN [begin(7)], COMMIT [commit(7)], ROLLBACK [rollback(7)] SQL - Language Statements 2010-05-14 END(7)
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