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Full Discussion: problem in greping the string from file using awk
Top Forums Shell Programming and Scripting problem in greping the string from file using awk Post 302188219 by era on Wednesday 23rd of April 2008 02:40:12 AM
Old 04-23-2008
I cannot reproduce the problem with the code you posted. The problem sounds like you have a space in your commands but you forgot to copy+paste precisely that space here ...?

Code:
vnix$ cat file
String main = "81507066666";
vnix$ NumberToReplace=`cat "file" | grep "String main"|awk -F '"' '{ print $2}'`
vnix$ StringToReplace="String main = \"$NumberToReplace\""
vnix$ echo "$StringToReplace"
String main = "81507066666"

Incidentally, cat | grep | awk is a magnificent Useless Use of Cat. Google for that. Here's a slightly less useless way to say that:

Code:
NumberToReplace=`awk -F '"' '/String main/ { print $2 }' "file"`

Anyway, if you want to replace that line in that file, you should probably be doing it all in a single awk command.

Code:
awk -F '"' -v newvalue="1234567" 'BEGIN { OFS=FS } /String main/ { $2 = newvalue; } { print }' "file"

 

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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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