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Full Discussion: Compare two files when pattern matched
Top Forums UNIX for Beginners Questions & Answers Compare two files when pattern matched Post 302979822 by RavinderSingh13 on Friday 19th of August 2016 08:50:56 AM
Old 08-19-2016
Quote:
Originally Posted by imranrasheedamu;
RudiC Sir!! Could you please explain your command
Hello imranrasheedamu,

Could you please let me know if following may help you here.
Code:
awk 'NR == FNR                         #### NR and FNR are the awk's inbuilt variables so condition NR==FNR willbe TRUE only when first file(file2) here will be read. Because FNR's value will be reset whenever a new file is being read but NR's value will be keep on increasing till the all files will be completed reading.
{T[$1];                                #### creating an array named T whose value is $1(first field).
next}                                  #### putting next(awk's inbuilt keyword) to skip all further statements now.
                                       #### All following statements will be read when second file named file1 is being read.
{FN = $0;                              #### creating a variable named FN whose value is $0(complete line).           
gsub (/^.*\/|.txt$/, _)}               #### gsub(awk's in-built functionality to globally subtitute the pattern in any line or variable, line here in this case. It will globally subsitutue everything till / (as per your requirement) with NULL.
$0 in T                                #### Now every line(which is formed by above subsitute command now) is present in array named T(which was created while file2 was getting read in NR==FNR condition).
{system ("echo cp " FN " /some/where") #### using system command(which is use to execute shell commands inside awk) executing echo command which will write the actually commands which we want to perform like cp source_file  Target_file in this case.
}' file2 file1                         #### Mentioning Input_files named file2 and file1 here.

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
imranrasheedamu
 

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LEARN ABOUT LINUX

comm

COMM(1) 							   User Commands							   COMM(1)

NAME

       comm - compare two sorted files line by line

SYNOPSIS

       comm [OPTION]... FILE1 FILE2

DESCRIPTION

       Compare sorted files FILE1 and FILE2 line by line.

       With  no  options,  produce three-column output.  Column one contains lines unique to FILE1, column two contains lines unique to FILE2, and
       column three contains lines common to both files.

       -1     suppress column 1 (lines unique to FILE1)

       -2     suppress column 2 (lines unique to FILE2)

       -3     suppress column 3 (lines that appear in both files)

       --check-order
	      check that the input is correctly sorted, even if all input lines are pairable

       --nocheck-order
	      do not check that the input is correctly sorted

       --output-delimiter=STR
	      separate columns with STR

       --help display this help and exit

       --version
	      output version information and exit

       Note, comparisons honor the rules specified by `LC_COLLATE'.

EXAMPLES

       comm -12 file1 file2
	      Print only lines present in both file1 and file2.

       comm -3
	      file1 file2  Print lines in file1 not in file2, and vice versa.

AUTHOR

       Written by Richard M. Stallman and David MacKenzie.

REPORTING BUGS

       Report comm bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report comm translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2010 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       join(1), uniq(1)

       The full documentation for comm is maintained as a Texinfo manual.  If the info and comm programs are properly installed at your site,  the
       command

	      info coreutils 'comm invocation'

       should give you access to the complete manual.

GNU coreutils 8.5						   February 2011							   COMM(1)
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