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Full Discussion: Extract large list of substrings
Top Forums Shell Programming and Scripting Extract large list of substrings Post 302233805 by dcfargo on Monday 8th of September 2008 01:14:16 PM
Old 09-08-2008
Extract large list of substrings
I have a very long string (millions of characters).

I have a file with start location and length that is thousands of rows long:

Start Length
5 10
16 21
44 100
215 37
...

I'd like to extract the substring that corresponds to the start and length from each row of the list:

I tried just using a large awk '{print substr($1,5,10), "\n", substr($1,16,21) "\n", substr($1,44,100) "\n", substr($1,215,37)...}' infile > outfile &

command

But it seems to hang likely because the Bash line is too long.

Can you help me with a way to get out the substrings as rows.
 

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LEARN ABOUT DEBIAN

unrar-free

UNRAR-FREE(1)						      General Commands Manual						     UNRAR-FREE(1)

NAME

       unrar-free -- extract files from rar archives

SYNOPSIS

       unrar-free [-xtfp?V]  [--extract]  [--list]  [--force]  [--extract-newer]  [--extract-no-paths]	[--password]  [--help]	[--usage]  [--ver-
       sion] ARCHIVE  [FILE ...]	  [DESTINATION]

DESCRIPTION

       unrar-free is a program for extracting files from rar archives.

OPTIONS

       These programs follow the usual GNU command line syntax, with long options starting with  two  dashes  (`-').   A  summary  of  options	is
       included below.

       -x   --extract
		 Extract files from archive (default).

       -t   --list
		 List files in archive.

       -f   --force
		 Overwrite files when extracting.

       --extract-newer
		 Only extract newer files from the archive.

       --extract-no-paths
		 Don't create directories while extracting.

       -p   --password
		 Decrypt archive using a password.

       -?   --help
		 Show program help.

       --usage	 Show short program usage message.

       -V	    --version
		 Show version of program.

NON-FREE UNRAR COMPATIBLE SYNOPSIS
       unrar-free [elvx]  [-ep]  [-o+]	[-o-]  [-ppassword]  [-u]  [--] ARCHIVE  [FILE ...]	     [DESTINATION]

       This  syntax  should only be used in front-end programs which are using non-free unrar as a back-end. It is recommended to use this program
       by GNU command line syntax.

       e	 Extract files from archive without full path.

       l	 List files in archive.

       v	 Verbose list files in archive.

       x	 Extract files from archive with full path.

       -ep	 Don't create directories while extracting.

       -o+	 Overwrite files when extracting.

       -o-	 Don't overwrite files when extracting.

       -p	 Decrypt archive using a password.

       -u	 Only extract newer files from the archive.

       --	 Disable further switch processing. Any switch after the -- are treated as filenames and destination.

BUGS

       Advanced features of version 3.0 archives are not currently supported.

AUTHORS

       unrar-free was written by Ben Asselstine based on UniquE RAR File Library by Christian Scheurer and Johannes Winkelmann.

       This manual page was written by Niklas Vainio <niklas.vainio@iki.fi> for the Debian system (but may be  used  by  others).   Permission	is
       granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 any later version pub-
       lished by the Free Software Foundation.

       On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL.

																     UNRAR-FREE(1)
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