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Full Discussion: Exact Search and Replace using AWK
Top Forums Shell Programming and Scripting Exact Search and Replace using AWK Post 302507451 by gimley on Wednesday 23rd of March 2011 11:28:24 PM
Old 03-24-2011
Exact Search and Replace using AWK
Hello.
I have written the following script to search and replace from one file into another.
Code:
#awk script to search and replace from file a in file b
NR == FNR { A[$1]=$2; next }
  { for( a in A ) sub(a, A[a])}1 file2 file1

While the function works pretty well, I want
a. The word in File 2 to mantained and also the replacement to be provided.
b. If there is a residue i.e. a word is not found in the master file (SnR) file, it should be listed in a file called residue.
How can I do this. I am new to awk and have reached this far in awk but tips to handle the issue would help
Sample files:
File1 (SnR file)
Code:
john=mary
pup=dog
cat=kitten

File2 (File for replacement)
Code:
john
pup
cat
jumbo

OUTPUT
Code:
=mary
=dog
=kitten

Expected output:
Code:
john=mary
pup=dog
cat=kitten

The residue "jumbo" could either be flagged as residue with a convenient marker say ! or stored in a separate file.
Many thanks in advance.
Last edited by Franklin52; 03-24-2011 at 04:04 AM.. Reason: Please use code tags
 

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LEARN ABOUT CENTOS

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)
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