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Full Discussion: Grepping one file column from another file
Top Forums Shell Programming and Scripting Grepping one file column from another file Post 302881097 by Akshay Hegde on Thursday 26th of December 2013 02:41:29 PM
Old 12-26-2013
Quote:
Originally Posted by newbie83
is it possible to limit the search by the first hit? That will reduce the runtime considerably, so as soon as the first hit is met, I would like to move on to the next line in file1, similar to a break in C.
Yes, as soon as field2 of file1 == 2nd sub field of field4 of file2 is true print line of file1 and line of file2 and then next, if you use break here it just terminates loop does not move to next line
Code:
$ awk  'FNR==NR{A[$4]=$0;next}{x=0;for(i in A){split(A[i],X,":");if($2==X[2]){x=1;print $0,A[i];next}}if(x==0)print}' file2 file1

Example :
Code:
$ awk  'FNR==NR{A[$4]=$0;next}{x=0;for(i in A){split(A[i],X,":");if($2==X[2]){x=1;print $0,A[i]}}print "without next and break";if(x==0)print}' file2 file1
A B C D L E:B:C  
without next and break
without next and break
E F
G H G H R H:H:I:J
without next and break

$ awk  'FNR==NR{A[$4]=$0;next}{x=0;for(i in A){split(A[i],X,":");if($2==X[2]){x=1;print $0,A[i];next}}print "with next";if(x==0)print}' file2 file1
A B C D L E:B:C  
with next
E F
G H G H R H:H:I:J

$ awk  'FNR==NR{A[$4]=$0;next}{x=0;for(i in A){split(A[i],X,":");if($2==X[2]){x=1;print $0,A[i];break}}print "with break";if(x==0)print}' file2 file1
A B C D L E:B:C  
with break
with break
E F
G H G H R H:H:I:J
with break

Last edited by Akshay Hegde; 12-26-2013 at 03:51 PM..
 

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LEARN ABOUT SUNOS

comm

comm(1) 							   User Commands							   comm(1)

NAME

       comm - select or reject lines common to two files

SYNOPSIS

       comm [-123] file1 file2

DESCRIPTION

       The comm utility reads file1 and file2, which must be ordered in the current collating sequence, and produces three text columns as output:
       lines only in file1; lines only in file2; and lines in both files.

       If the input files were ordered according to the collating sequence of the current locale, the lines  written  will  be	in  the  collating
       sequence of the original lines. If not, the results are unspecified.

OPTIONS

       The following options are supported:

       -1	Suppresses the output column of lines unique to file1.

       -2	Suppresses the output column of lines unique to file2.

       -3	Suppresses the output column of lines duplicated in file1 and file2.

OPERANDS

       The following operands are supported:

       file1	A path name of the first file to be compared. If file1 is -, the standard input is used.

       file2	A path name of the second file to be compared. If file2 is -, the standard input is used.

USAGE

       See largefile(5) for the description of the behavior of comm when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

EXAMPLES

       Example 1: Printing a list of utilities specified by files

       If file1, file2, and file3 each contain a sorted list of utilities, the command

       example% comm -23 file1 file2  | comm -23 - file3

       prints a list of utilities in file1 not specified by either of the other files. The entry:

       example% comm -12 file1 file2 | comm -12 - file3

       prints a list of utilities specified by all three files. And the entry:

       example% comm -12  file2 file3 | comm -23 -file1

       prints a list of utilities specified by both file2 and file3, but not specified in file1.

ENVIRONMENT VARIABLES

       See  environ(5)	for  descriptions  of  the  following  environment  variables that affect the execution of comm: LANG, LC_ALL, LC_COLLATE,
       LC_CTYPE, LC_MESSAGES, and NLSPATH.

EXIT STATUS

       The following exit values are returned:

       0	All input files were successfully output as specified.

       >0	An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWesu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |enabled			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       cmp(1), diff(1), sort(1), uniq(1), attributes(5), environ(5), largefile(5), standards(5)

SunOS 5.10							    3 Mar 2004								   comm(1)
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