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Top Forums Shell Programming and Scripting omitting lines from file A that are in file B Post 302168501 by gneen on Monday 18th of February 2008 03:22:26 PM
Old 02-18-2008
omitting lines from file A that are in file B

I've got file A with (say) 1M lines in it ... ascii text, space delimited ...

I've got file B with (say) 10M lines in it ... same structure.

I want to remove any lines from A that appear (identically) in B and print the remaining (say) 900K lines. (And I want to do it in zero time of course!)

Best I've come up with so far is somehow marking the lines in A, then doing a sort and applying an awk script to the result so that the marked lines are only printed if the following (or previous) line isn't "identical" except for the mark.

But after 1000 years of shell programming I've GOT to believe I'm missing an easier/faster solution ... I'm using bash and cygwin tools - and compiling is not an option.

ADVthanksANCE for your help!
=Gneen
 

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fmt(1)								   User Commands							    fmt(1)

NAME
fmt - simple text formatters SYNOPSIS
fmt [-cs] [-w width | -width] [inputfile]... DESCRIPTION
fmt is a simple text formatter that fills and joins lines to produce output lines of (up to) the number of characters specified in the -w width option. The default width is 72. fmt concatenates the inputfiles listed as arguments. If none are given, fmt formats text from the standard input. Blank lines are preserved in the output, as is the spacing between words. fmt does not fill nor split lines beginning with a `.' (dot), for compatibility with nroff(1). Nor does it fill or split a set of contiguous non-blank lines which is determined to be a mail header, the first line of which must begin with "From". Indentation is preserved in the output, and input lines with differing indentation are not joined (unless -c is used). fmt can also be used as an in-line text filter for vi(1). The vi command: !}fmt reformats the text between the cursor location and the end of the paragraph. OPTIONS
-c Crown margin mode. Preserve the indentation of the first two lines within a paragraph, and align the left margin of each subsequent line with that of the second line. This is useful for tagged paragraphs. -s Split lines only. Do not join short lines to form longer ones. This prevents sample lines of code, and other such for- matted text, from being unduly combined. -w width | -width Fill output lines to up to width columns. OPERANDS
inputfile Input file. ENVIRONMENT VARIABLES
See environ(5) for a description of the LC_CTYPE environment variable that affects the execution of fmt. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
nroff(1), vi(1), attributes(5), environ(5) NOTES
The -width option is acceptable for BSD compatibility, but it may go away in future releases. SunOS 5.11 9 May 1997 fmt(1)
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