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Full Discussion: compare file columns
Top Forums Shell Programming and Scripting compare file columns Post 302284228 by learnoutmore99 on Thursday 5th of February 2009 03:58:50 AM
Old 02-05-2009
Bug compare file columns

I need help in file comparision.

I have two files in below format:
FILE_A:
-------
COL1 COL2 COL3 COL4 COL5

FILE_B:
-------
COL1A COL1B COL1C COL1D COL1E

i want to compare for a for each row in FILE_A and FILE_B
COL1 of FILE_A with COL1B of FILE_B
COL3 of FILE_A with COL1E of FILE_B
COL5 of FILE_A with COL1C of FILE_B

and in case they are matching, print the column values COL1 COL2 COL3 from FILE_A into FILE_OK,
and if they do not match then print them into FILE_ERR.txt

for example
FILE_A:
-------
A B C D 1
E F G H 2
I J K L 3

FILE_B:
-------
X E 2 M G
Y A 1 O T
for above two files, first row column of FILE_A (COL1, COL3 and COL5) are matching with
2nd row columns COL1B, COL1E and COL1C respectively of FILE_B, but for second row in FILE_A
they are not matching (COL3 not matching with COL1E).
what is the fastest possible way to do it using awk (or otherwise) ?
if i read line by line, it takes a lot of time as each file contains 50k++ records

Thanks in advance
:-)
 

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PSC(1)							      General Commands Manual							    PSC(1)

NAME
psc - prepare sc files SYNOPSIS
psc [-fLkrSPv] [-s cell] [-R n] [-C n] [-n n] [-d c] DESCRIPTION
Psc is used to prepare data for input to the spreadsheet calculator sc(1). It accepts normal ascii data on standard input. Standard out- put is a sc file. With no options, psc starts the spreadsheet in cell A0. Strings are right justified. All data on a line is entered on the same row; new input lines cause the output row number to increment by one. The default delimiters are tab and space. The column for- mats are set to one larger than the number of columns required to hold the largest value in the column. OPTIONS
-f Omit column width calculations. This option is for preparing data to be merged with an existing spreadsheet. If the option is not specified, the column widths calculated for the data read by psc will override those already set in the existing spreadsheet. -L Left justify strings. -k Keep all delimiters. This option causes the output cell to change on each new delimiter encountered in the input stream. The default action is to condense multiple delimiters to one, so that the cell only changes once per input data item. -r Output the data by row first then column. For input consisting of a single column, this option will result in output of one row with multiple columns instead of a single column spreadsheet. -s cell Start the top left corner of the spreadsheet in cell. For example, -s B33 will arrange the output data so that the spreadsheet starts in column B, row 33. -R n Increment by n on each new output row. -C n Increment by n on each new output column. -n n Output n rows before advancing to the next column. This option is used when the input is arranged in a single column and the spreadsheet is to have multiple columns, each of which is to be length n. -d c Use the single character c as the delimiter between input fields. -P Plain numbers only. A field is a number only when there is no imbedded [-+eE]. -S All numbers are strings. -v Print the version of psc SEE ALSO
sc(1) AUTHOR
Robert Bond PSC 7.16 19 September 2002 PSC(1)
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