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Top Forums Shell Programming and Scripting Splitting a text file into smaller files with awk, how to create a different name for each new file Post 303027071 by jim mcnamara on Saturday 8th of December 2018 12:10:28 AM
Old 12-08-2018
Note: the csplit syntax is incorrect Ignore the example. See Don Cragun's post below
Have you looked at the csplit command? It works by context (context split), and the split is based on a string or a pattern, not length of records or block sizes. You make it it use fix number of records per output small file as well. Your requirement is for a pattern I think.
Code:
csplit /pattern/ filename

e.g.,
Code:
   csplit /$$$$/ inputfilename

You get to specify the output filenames, so a quick read of the man page is in order, but they are generally something like xx01, xx02 by default.
Change the prefix and if there are literally thousands of possible output files, then declare 4 or 5 digits for the numeration operator.

FWIW sounds like you need a sqlite db or something similar, maintaining thousands of files are a nightmare waiting to happen.

Last edited by jim mcnamara; 12-10-2018 at 02:49 PM.. Reason: Error.
These 2 Users Gave Thanks to jim mcnamara For This Post:
 

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anno(1mh)																 anno(1mh)

Name
       anno - annotate messages

Syntax
       anno [ +folder ] [ msgs ] [ -component field ] [ -help ] [ -[no]inplace ] [ -text body ]

Description
       The command annotates a message by adding one or more header fields to the message.

       The  command  allows  you to choose the name of the header field which you add.	It records the date at which the message is annotated, and
       allows you to add an additional field containing text, if you wish.

       You can use with and to keep track of how you have distributed, forwarded, or replied to messages.

       By default, annotates the current message in the current folder.  You can select another message by using the msg  and  +folder	arguments.
       You can also annotate more than one message, or a range of messages.

Options
       -component field
		 Specifies  the  name  of the header field which adds.	It should be a valid RFC 822-style message field name, which means that it
		 should consist of alphanumeric characters or dashes only.  If you do not supply this option, will prompt you for the field name.

       -help	 Prints a list of the valid options to this command.

       -inplace
       -noinplace
		 The -inplace switch causes annotation to be done in place in order to preserve links to the annotated message.

       -text body
		 Allows you to add a header field containing text to the message.  The command will create a second header field on  the  message,
		 containing  the  text that you specify.  If the text contains a space, you must enclose the text in double quotes (").  If you do
		 not supply this option, adds only one field, which contains the date of the annotation.

       The default settings for this command are:

	      +folder defaults to the current folder
	      msgs defaults to the current message
	      -noinplace

Examples
       This example annotates message number 1 in the folder The -component option specifies the name of the header field:
       % anno 1 +test -component Forwarded
       The following field is added to the message header:
       Forwarded: Tue, 08 Jan 91 16:10:06 +0000

       The next example shows how to use the -text option to add an additional field:
       % anno -component Forwarded -text "to David - as requested"
       The following lines are added to the message header:
       Forwarded: Tue, 08 Jan 91 16:13:27 +0000
       Forwarded: to David - as requested

       The final example shows how prompts for the name of the header field, if the -component option is not supplied:
       % anno
       Enter component name: forwarded
       The following line is added to the message:
       forwarded: Tue, 08 Jan 91 16:21:58 +0000

Profile Components
       Path:   To determine your Mail directory

Files
       The user profile.

See Also
       dist(1mh), forw(1mh), repl(1mh)

																	 anno(1mh)
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