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Full Discussion: replace newline between strings
Top Forums Shell Programming and Scripting replace newline between strings Post 302496034 by acruhl on Saturday 12th of February 2011 12:56:56 AM
Old 02-12-2011
replace newline between strings
I'm trying to figure out a way to replace newlines after a unique string is read, all the way until that string occurs again.

The input file looks something like this:
Code:
02/11/11 22:48:00 This is the first line
This is the second line
This is the third line
02/11/11 22:49:00 This is the fifth line
This is the sixth line
02/11/11 22:49:00 This is the seventh line
02/11/11 22:50:00 This is the eighth line

And so on. In this case, the unique string is the date and time strings together.

I'm hoping after replacing the newline characters, it ends up looking like this:
Code:
02/11/11 22:48:00 This is the first line This is the second line This is the third line
02/11/11 22:49:00 This is the fifth line This is the sixth line
02/11/11 22:49:00 This is the seventh line
02/11/11 22:50:00 This is the eighth line

I have been trying something like this, but I don't know what the newline substitution should look like, or if this is even valid because it doesn't work:
Code:
cat file.txt | awk '/^[0-1][0-9]\/[0-9][0-9]\/[0-9][0-9]\ [0-2][0-9]:[0-5][0-9]:[0-5][0-9]/,
     {gsub ("\n"," ")} /[0-1][0-9]\/[0-9][0-9]\/[0-9][0-9]\ [0-2][0-9]:[0-5][0-9]:[0-5][0-9]/' > newfile.txt

Again, in general, I'm trying to read a unique string, then replace all newlines up until the last one encountered before reading that unique string again.

Thanks for any help!
Last edited by Scott; 02-12-2011 at 10:40 AM.. Reason: Please use code tags
 

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LEARN ABOUT REDHAT

line

line(1)                                                            User Commands                                                           line(1)

NAME

       line - read one line

SYNOPSIS

       line

DESCRIPTION

       The  line utility copies one line (up to and including a new-line) from the standard input and writes it on the standard output. It returns
       an exit status of 1 on EOF and always prints at least a new-line. It is often used within shell files to read from the user's terminal.

EXIT STATUS

       Exit status is:

       0        Successful completion

       >0       End-of-file on input.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       sh(1), read(2), attributes(5)

SunOS 5.10                                                          1 Feb 1995                                                             line(1)
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