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Top Forums Shell Programming and Scripting Match and print columns in second file Post 302627525 by birei on Friday 20th of April 2012 04:59:52 PM
Old 04-20-2012
Hi newpro,

One way:
Code:
$ cat file1
X1
X3
X4
$ cat file2
ID      X1      X2      X3      X4
A       1       6       2       1
B       2       7       3       3
C       3       8       4       1
D       4       9       1       1
$ cat script.awk 
BEGIN { 
        OFS = "\t" 
} 

FNR == NR { 
        f1[ $1 ] = 1
        next
} 

FNR < NR && FNR == 1 { 
        for ( i = 1; i <= NF; i++ ) { 
                if ( f1[ $i ] ) { 
                        header = header i 
                } 
        }
}

{ 
        for ( i = 1; i <= NF; i++ ) {
                if ( index( header, i ) > 0 ) {
                        printf $i OFS
                }
        }
        printf ORS
} 
$ awk -f script.awk file1 file2
X1      X3      X4
1       2       1
2       3       3
3       4       1
4       1       1

This User Gave Thanks to birei For This Post:
 

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CAT(1)							      General Commands Manual							    CAT(1)

NAME
cat - catenate and print SYNOPSIS
cat [ -u ] [ -n ] [ -s ] [ -v ] file ... DESCRIPTION
Cat reads each file in sequence and displays it on the standard output. Thus cat file displays the file on the standard output, and cat file1 file2 >file3 concatenates the first two files and places the result on the third. If no input file is given, or if the argument `-' is encountered, cat reads from the standard input file. Output is buffered in the block size recommended by stat(2) unless the standard output is a terminal, when it is line buffered. The -u option makes the output completely unbuffered. The -n option displays the output lines preceded by lines numbers, numbered sequentially from 1. Specifying the -b option with the -n option omits the line numbers from blank lines. The -s option crushes out multiple adjacent empty lines so that the output is displayed single spaced. The -v option displays non-printing characters so that they are visible. Control characters print like ^X for control-x; the delete char- acter (octal 0177) prints as ^?. Non-ascii characters (with the high bit set) are printed as M- (for meta) followed by the character of the low 7 bits. A -e option may be given with the -v option, which displays a `$' character at the end of each line. Specifying the -t option with the -v option displays tab characters as ^I. SEE ALSO
cp(1), ex(1), more(1), pr(1), tail(1) BUGS
Beware of `cat a b >a' and `cat a b >b', which destroy the input files before reading them. 4th Berkeley Distribution May 5, 1986 CAT(1)
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