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Top Forums Shell Programming and Scripting awk comparison and substitution Post 302573634 by waddle on Tuesday 15th of November 2011 06:31:32 AM
Old 11-15-2011
The script should chek FileA[1] for a line containing a value greater or equal to a value, in this example 3.5. If this is true, the original value should be printed, if it's false, this specific value (in this example in line 1 of FileA[1]) should be replaced with the corresponding value in FileB, here line1 (since its FileA[1]), column 1 (first value in FileA). Again, notice that the corresponding values are listed in one column in FileA and one line in FileB.

I hope, it's better to understand now...
 

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COMM(1) 						    BSD General Commands Manual 						   COMM(1)

NAME
comm -- select or reject lines common to two files SYNOPSIS
comm [-123i] file1 file2 DESCRIPTION
The comm utility reads file1 and file2, which should be sorted lexically, and produces three text columns as output: lines only in file1; lines only in file2; and lines in both files. The filename ``-'' means the standard input. The following options are available: -1 Suppress printing of column 1. -2 Suppress printing of column 2. -3 Suppress printing of column 3. -i Case insensitive comparison of lines. Each column will have a number of tab characters prepended to it equal to the number of lower numbered columns that are being printed. For example, if column number two is being suppressed, lines printed in column number one will not have any tabs preceding them, and lines printed in column number three will have one. The comm utility assumes that the files are lexically sorted; all characters participate in line comparisons. ENVIRONMENT
The LANG, LC_ALL, LC_COLLATE, and LC_CTYPE environment variables affect the execution of comm as described in environ(7). EXIT STATUS
The comm utility exits 0 on success, and >0 if an error occurs. SEE ALSO
cmp(1), diff(1), sort(1), uniq(1) STANDARDS
The comm utility conforms to IEEE Std 1003.2-1992 (``POSIX.2''). The -i option is an extension to the POSIX standard. HISTORY
A comm command appeared in Version 4 AT&T UNIX. BUGS
Input lines are limited to LINE_MAX (2048) characters in length. BSD
January 26, 2005 BSD
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