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Top Forums Shell Programming and Scripting Compare multiple fields in file1 to file2 and print line and next line Post 302297472 by gillesc_mac on Friday 13th of March 2009 02:12:41 PM
Old 03-13-2009
Compare multiple fields in file1 to file2 and print line and next line

Hello,

I have two files that I need to compare and print out the line from file2 that has the first 6 fields matching the first 6 fields in file1. Complicating this are the following restrictions

1. file1 is only a few thousand lines at most and file2 is greater than 2 million
2. I need to match the first 6 fields (in order) of each line in file1 to the first 6 fields (in order) in a line in file2 and print the matched line from file2 along with the next line in file2.

Example files

file1:

...
0.54 3.2 0.45 32.9 4 0.02 9.0 4.0 (line 364)
0.6 4.0 3.99 2.0 0.85 7.0 3.84 0.05 (line 365)
...

file2:

93 28 04 73 95 11 0.4 7.9 2.30 4.05 (100(f18.3)) (line 30046)
70.1 99.4 0.35 9.943 6.1 0.27 0.654 (line 30047)
0.54 3.2 0.45 32.9 4 0.02 9.0 4.0 (54(f18.3) (line 628450)
44.8 33.2 90.3 45.2 66.3 (line 628451)

Needed result matches line 364 from file1 to line 628450 from file2 and prints lines 628450 and 628451, then goes to line 365 of file1 and searches file2 for a match to print matching first line and necessary second line from file2

Example partial output matching file1 with file2

0.54 3.2 0.45 32.9 4 0.02 9.0 4.0 (54(f18.3)
44.8 33.2 90.3 45.2 66.3

I don't really care what I use, awk, sed, perl, etc. I just need it to work.

Hopefully this make sense.

Thanks

Chris
 

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MV(1)							      General Commands Manual							     MV(1)

NAME
mv - move or rename files SYNOPSIS
mv [ -i ] [ -f ] [ - ] file1 file2 mv [ -i ] [ -f ] [ - ] file ... directory DESCRIPTION
Mv moves (changes the name of) file1 to file2. If file2 already exists, it is removed before file1 is moved. If file2 has a mode which forbids writing, mv prints the mode (see chmod(2)) and reads the standard input to obtain a line; if the line begins with y, the move takes place; if not, mv exits. In the second form, one or more files (plain files or directories) are moved to the directory with their original file-names. Mv refuses to move a file onto itself. Options: -i stands for interactive mode. Whenever a move is to supercede an existing file, the user is prompted by the name of the file followed by a question mark. If he answers with a line starting with 'y', the move continues. Any other reply prevents the move from occur- ring. -f stands for force. This option overrides any mode restrictions or the -i switch. - means interpret all the following arguments to mv as file names. This allows file names starting with minus. SEE ALSO
cp(1), ln(1) BUGS
If file1 and file2 lie on different file systems, mv must copy the file and delete the original. In this case the owner name becomes that of the copying process and any linking relationship with other files is lost. 4th Berkeley Distribution April 29, 1985 MV(1)
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