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Top Forums UNIX for Dummies Questions & Answers Search and extract matching patterns Post 302602342 by balajesuri on Monday 27th of February 2012 05:28:38 AM
Old 02-27-2012
This goes through a lot of loops. Might take a lot of time if "bigdb.tab" is really big enough.

Code:
#! /bin/bash

while read x
do
    while read f1
    do
        echo $x | grep -q -w $f1
        if [ $? -eq 0 ]
        then
            y=`echo "$x" | sed "s/\(.*\)\t.*$f1.*/\1\t$f1/"`
            while read f2
            do
                echo "$x" | grep -q -w $f2
                if [ $? -eq 0 ]
                then
                    echo -e "$y\t$f2" >> output.tab
                    break
                fi
            done < file2.tab
            break
        fi
    done < file1.tab
done < bigdb.tab

 

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echo(1) 						      General Commands Manual							   echo(1)

NAME
echo - echo (print) arguments SYNOPSIS
[arg] ... DESCRIPTION
writes its arguments separated by blanks and terminated by a new-line on the standard output. It also understands C-like escape conven- tions; beware of conflicts with the shell's use of write an alert character backspace print line without appending a new-line form-feed new-line carriage return tab vertical tab backslash the 8-bit character whose ASCII code is the 1-, 2-, 3- or 4-digit octal number n, whose first character must be a zero. write an 8-bit value that is the zero-, one-, two- or three-digit octal number num is useful for producing diagnostics in command files and for sending known data into a pipe. Notes Berkeley differs from this implementation. The former does not implement the backslash escapes. However, the semantics of the escape can be obtained by using the option. The echo command implemented as a built-in function of follows the Berkeley semantics (see csh(1)). EXTERNAL INFLUENCES
Environment Variables determines the interpretation of arg as single and/or multi-byte characters. If is not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty vari- able. If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of If any internationalization variable contains an invalid setting, behaves as if all internationalization variables are set to "C". See environ(5). International Code Set Support Single- and multi-byte character code sets are supported. AUTHOR
was developed by OSF and HP. SEE ALSO
sh(1). BUGS
No characters are printed after the first This is not normally a problem. STANDARDS CONFORMANCE
echo(1)
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