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Full Discussion: Splitting a delimited text file
Top Forums Shell Programming and Scripting Splitting a delimited text file Post 302899054 by lupin..the..3rd on Friday 25th of April 2014 04:58:46 PM
Old 04-25-2014
Splitting a delimited text file
Howdy folks, I've got a very large plain text file that I need to split into many smaller files. My script-fu is not powerful enough for this, so any assistance is much appreciated.

The file is a database dump from Cyrus IMAP server. It's basically a bunch of emails (thousands) all concatenated into one huge file. There is a delimiter line between each email. It looks something like this

Code:
--dump-4564564.some.jibberish.whatever
From: user@domain.com
To: myfriend@email.com

Email Body

Best Regards,
Email Author

--dump-789789863.random.numbers.maybe
From: anotheruser@domain.com
To: someguy@planet.earth

Email Body

Your Friend,
another user

So as you can see, the start of each email is preceded with a line that begins with "--dump".

What I'm looking for, is:

1. To split this monolithic file into many smaller files, where each smaller file contains a single email.
2. Where each smaller file should contain all of the lines of text after a "--dump" delimiter, up until the next "--dump" delimiter (or end of file).
3. And the "--dump" delimiter line itself should not be included in each smaller file.

I feel like some awk/grep/sed magic could do this, but I'm not enough of a wizard to write this script.

Thank you very much!
 

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LEARN ABOUT HPUX

cr_open

cr_open(3)						     Library Functions Manual							cr_open(3)

NAME

       cr_open() - open crash dump for reading

SYNOPSIS

DESCRIPTION

       The library call opens a crash dump and passes back a crash dump descriptor.

       The path argument points to a path name naming a crash dump directory or file, and must not exceed bytes in length.

       The CRASH * to which crash_cb points is set to a crash dump descriptor, which can then be passed to the other functions to access the crash
       dump.

       flags is a bitmask of zero or more of the following flag values, which affect the operation of future calls to libcrash routines  for  this
       crash dump, except for cr_verify(3), which has its own flags parameter.

       The library will not attempt to verify checksums of files in the crash
			     dump if this flag is set.

       The library will write messages to stderr during time-consuming operations
			     (decompressions and checksums) if this flag is set.

RETURN VALUE

       Returns zero for success.  Other possible return values are described in libcrash(5).

EXAMPLES

       The following call to opens crash dump contained in the directory and returns the crash dump descriptor For an example of reading the crash
       dump see the cr_read(3) manual entry.

AUTHOR

       was developed by HP.

SEE ALSO

       cr_close(3), cr_perror(3), libcrash(5).

																	cr_open(3)
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