Extract distinc sequence of letters Post: 302921010

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Top Forums Shell Programming and Scripting Extract distinc sequence of letters Post 302921010 by Don Cragun on Tuesday 14th of October 2014 07:17:39 AM

10-14-2014

Registered User

You could also try something like:

Code:

#!/bin/ksh
IAm=${0##*/}
if [ $# -lt 3 ]
then	printf 'Usage: %s first_char# last_char# file...\n' "$IAm" >&2
	exit 1
fi
first="$1"
last="$2"
shift 2
awk -v fc="$first" -v lc="$last" '
BEGIN {	fl = int((fc - 1) / 60) + 1	# first line # containing data to copy
	ll = int((lc - 1) / 60) + 1	# last line # containing data to copy
	flc1 = fc % 60 ? fc % 60 : 60	# first character # to copy on line fl
	llcl = lc % 60 ? lc % 60 : 60	# last character # to copy on line ll
}
FNR >= fl && FNR <= ll {
	s = $2 $3 $4 $5 $6 $7
	printf("%s%s", substr(s, FNR == fl ? flc1 : 1,
		FNR == ll ? FNR == fl ? llcl - flc1 + 1 : llcl : 60),
		FNR == ll ? "\n" : "")
	if(FNR == ll) nextfile
}' "$@"

I prefer ksh over bash, but this script will work with either shell. This script allows you to specify the starting character number, the last character number, and a list of one or more files to process. It should work fine on any Linux system, but the awk nextfile command is an extension to the standards. If your version of awk does not have nextfile:

if you only want to process one file at a time, change nextfile to exit,
otherwise, remove the entire line shown in red (it will still produce correct output, but will run slower; especially on large files). Note that the code shown in blue can be removed as long as this line remains in your code (with either exit or nextfile.)

If someone else reading this thread wants to try this on a Solaris/SunOS system, change awk in the script to /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or /usr/bin/nawk.

Don Cragun

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swfextract

swfextract(1)							     swftools							     swfextract(1)

NAME

       swfextract - a tool for extracting data out of swf files.

Synopsis
       swfextract [options] [file.swf]

DESCRIPTION

       swfextracts allows one to extract swf movieclips and objects out of swf files.

       SWF files are animation files which can be displayed in Web Browsers using the Flash Plugin.

OPTIONS

       -h, --help
	      Print short help message and exit

       -o, --output filename
	      Write output to file filename

       -V, --version
	      Print version info and exit

       -i, --id ids
	      ids is a range of IDs to extract. E.g. 1-10,14

       -j, --jpegs ids
	      ids is a range of JPEG IDs to extract. E.g. 1-2,3,14-

       -p, --pngs ids
	      ids is a range of PNG IDs to extract. E.g. -10,20-30

       -f, --frame frames
	      frames is a range of frames to extract. E.g. 1-10,20-30,40-

       -n, --name name
	      Set the name of the object to extract to name.

       -w, --hollow
	      Copy empty frames to the output file, too.

       -P, --placeobject
	      Copy  original  placeobject  tag	for the given object into the output file (Use with -i). This means that the object is at the same
	      position in the generated movie as in the original movie.

       -j, --jpegs range
	      Extract jpeg pictures in range

       -p, --pngs range
	      Extract png pictures in range

       -m, --mp3
	      Extract main mp3 stream (There may be substreams in the Movieclips, as well. To extract these, first extract the Movieclips with	-i
	      and then use -m)

AUTHOR

       Matthias Kramm <kramm@quiss.org>

swfdump 							   January 2003 						     swfextract(1)

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