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Top Forums Shell Programming and Scripting awk or grep to search one column and output the other Post 302834811 by Manyaka on Saturday 20th of July 2013 03:46:09 AM
Old 07-20-2013
awk or grep to search one column and output the other

Hello,

it would be great if someone can help me with the following:
I want to search for the rows from fileA in column 1 of fileB and output column 2 of fileB if found in fileC. In the moment I search within the complete file. How can I change the code so only column 1 is searched?

Code:
cat fileA | while read row ; do
grep "$row" fileB | awk -F"\t" '{print $2}' > fileC


Last edited by Scott; 07-20-2013 at 04:47 AM.. Reason: Code tags
 

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SPI_MODIFYTUPLE(3)					  PostgreSQL 9.2.7 Documentation					SPI_MODIFYTUPLE(3)

NAME
SPI_modifytuple - create a row by replacing selected fields of a given row SYNOPSIS
HeapTuple SPI_modifytuple(Relation rel, HeapTuple row, int ncols, int * colnum, Datum * values, const char * nulls) DESCRIPTION
SPI_modifytuple creates a new row by substituting new values for selected columns, copying the original row's columns at other positions. The input row is not modified. ARGUMENTS
Relation rel Used only as the source of the row descriptor for the row. (Passing a relation rather than a row descriptor is a misfeature.) HeapTuple row row to be modified int ncols number of column numbers in the array colnum int * colnum array of the numbers of the columns that are to be changed (column numbers start at 1) Datum * values new values for the specified columns const char * Nulls which new values are null, if any (see SPI_execute_plan for the format) RETURN VALUE
new row with modifications, allocated in the upper executor context; NULL only if row is NULL On error, SPI_result is set as follows: SPI_ERROR_ARGUMENT if rel is NULL, or if row is NULL, or if ncols is less than or equal to 0, or if colnum is NULL, or if values is NULL. SPI_ERROR_NOATTRIBUTE if colnum contains an invalid column number (less than or equal to 0 or greater than the number of column in row) PostgreSQL 9.2.7 2014-02-17 SPI_MODIFYTUPLE(3)
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