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Full Discussion: Extract distinc sequence of letters
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
Old 10-14-2014
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.
 

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LEARN ABOUT DEBIAN

mdraw_default_line_break

mdraw_default_line_break(3m17n) 				 The m17n Library				   mdraw_default_line_break(3m17n)

NAME

       mdraw_default_line_break - Calculate a line breaking position.

SYNOPSIS

       int mdraw_default_line_break (MText * mt, int pos, int from, int to, int line, int y)

DESCRIPTION

       Calculate a line breaking position. The function mdraw_default_line_break() calculates a line breaking position based on the line number
       line and the coordinate y, when a line is too long to fit within the width limit.  pos is the position of the character next to the last
       one that fits within the limit.	from is the position of the first character of the line, and to is the position of the last character
       displayed on the line if there were not width limit.  line and y are reset to 0 when a line is broken by a newline character, and
       incremented each time when a long line is broken because of the width limit.

RETURN VALUE

	   This function returns a character position to break the line.

COPYRIGHT

       Copyright (C) 2001 Information-technology Promotion Agency (IPA)
       Copyright (C) 2001-2011 National Institute of Advanced Industrial Science and Technology (AIST)
       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License
       <http://www.gnu.org/licenses/fdl.html>.

Version 1.6.2							    12 Jan 2011 				   mdraw_default_line_break(3m17n)
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