How to replace a range of text with sed or awk? Post: 302307222

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Top Forums Shell Programming and Scripting How to replace a range of text with sed or awk? Post 302307222 by TXTad on Wednesday 15th of April 2009 01:38:32 AM

04-15-2009

Registered User

I have the following file:

Code:

# Some comments
# S'more comments

[daemon]
TimedLoginEnable=true
TimedLoginDelay=10
TimedLogin=user1
# and maybe some other, unpredictable lines that I don't need or want

[security]

[xdmcp]

[gui]
...

I wish for it to become something like

Code:

# Some comments
# S'more comments

[daemon]
TimedLoginEnable=true
TimedLoginDelay=5
TimedLogin=user2

[security]

[xdmcp]

[gui]
...

So far, I have managed to come up with this awk script:

Code:

BEGIN {
    searching = 1; 
    done = 0
}
searching == 1 {
    print;
    if ($1 == "[daemon]") {
        searching = 0;
        print "TimedLoginEnable=true";
        print "TimedLoginDelay=5";
        print "TimedLogin=user2";
        print "";
    }
}
searching == 0 {
    if (done) {
        print;
    } else {
        getline;
        if (match($0, /^\[/)) {
            print;
            done = 1;
        }
    }
}

But I feel like the awk script should be more concise, and I also suspect that this can be done in sed, but I don't even know where to start on that one.

Thanks,
Tad

Last edited by TXTad; 04-15-2009 at 02:41 AM.. Reason: fixed code typo

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LEARN ABOUT REDHAT

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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