"if matching strings in file1 and file2, add column from file1 to file2"

Post #302674487 by agama on Thursday 19th of July 2012 07:58:03 PM

This will use a bit more memory, but saves heavily on I/O as it requires each file to be read only once. Depending on the size of the files, should run much more quickly.

Code:
awk '
    NR == FNR { f1[$1] = $2; next; }
    {
        split( $1, a, "_" );
        printf( "%s %s\n", f1[a[2]+0], $0 );
    }
'  file1 file2

This User Gave Thanks to agama For This Post:
 
Test Your Knowledge in Computers #765
Difficulty: Medium
Cache read misses from an instruction cache generally cause the longest delays because the processor, and in particular the thread of execution, has to wait until the instruction is fetched from main memory.
True or False?

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XZDIFF(1)							     XZ Utils								 XZDIFF(1)

NAME
xzcmp, xzdiff, lzcmp, lzdiff - compare compressed files SYNOPSIS
xzcmp [cmp_options] file1 [file2] xzdiff [diff_options] file1 [file2] lzcmp [cmp_options] file1 [file2] lzdiff [diff_options] file1 [file2] DESCRIPTION
xzcmp and xdiff invoke cmp(1) or diff(1) on files compressed with xz(1), lzma(1), gzip(1), or bzip2(1). All options specified are passed directly to cmp or diff. If only one file is specified, then the files compared are file1 (which must have a suffix of a supported com- pression format) and file1 from which the compression format suffix has been stripped. If two files are specified, then they are uncom- pressed if necessary and fed to cmp(1) or diff(1). The exit status from cmp or diff is preserved. The names lzcmp and lzdiff are provided for backward compatibility with LZMA Utils. SEE ALSO
cmp(1), diff(1), xz(1), gzip(1), bzip2(1), zdiff(1) BUGS
Messages from the cmp(1) or diff(1) programs refer to temporary filenames instead of those specified. Tukaani 2009-07-05 XZDIFF(1)

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