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Full Discussion: Text file manipulation
Top Forums UNIX for Dummies Questions & Answers Text file manipulation Post 302170339 by Ezy on Monday 25th of February 2008 09:42:56 AM
Old 02-25-2008
Java Text file manipulation
I am a new unix user & I wanted to work with unix as it is very good in text manipulations. I need a little help. I will be grateful if someone can help me out.

I need help in grepping a pattern of numbers from one file to another file. Specific details are as follows:

File one contains only one column of numbers like

897887738753
881388745527
237818494899
331388745702
451388746000
911388746146
891388746156

file 2 contains three column of numbers 1st column is just the hash mark then another set of numbers & then column 3 (the numbers of my interest).

## 234451388746000 447887738753
## 234159018106564 447818494899
## 234159055332992 897887738753
## 234159043784408 881388745527
## 234159026266547 237818494899
## 234154821274370 331388745702
## 234159053081262 451388746000
## 234159020233321 911388746146
## 234159014081879 891388746156

I want to grep numbers in File 1 from 3rd column of file 2 and as a result I should get out put as the whole line in file 2 which has the matching number in column 3 of file 1

I am trying: grep -f file1 file2 > file3

but the problem with it is that if it finds a similar match even in column 2 it prints it. Like in above case output will be

## 234159055332992 897887738753
## 234159043784408 881388745527
## 234159026266547 237818494899
## 234154821274370 331388745702
## 234159053081262 451388746000
## 234159020233321 911388746146
## 234159014081879 891388746156

&

## 234451388746000 447887738753 (which is not right because the 3rd column of file2 does not have any match in file1)


One more thing I am using cygwin to create unix enviornment on my windows machine & its not actually a unix machine but just unix environment.
 

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LEARN ABOUT FREEBSD

comm

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, lines only in file1.

     -2      Suppress printing of column 2, lines only in file2.

     -3      Suppress printing of column 3, lines common to both.

     -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.

BSD
								 December 12, 2009							       BSD
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