Extracting 22-character strings from text using sed/awk? Post: 302853627

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Top Forums UNIX for Dummies Questions & Answers Extracting 22-character strings from text using sed/awk? Post 302853627 by wisecracker on Sunday 15th of September 2013 01:53:49 PM

09-15-2013

Registered User

Some assumptions have to made here:-
1) The flatfile is pure alpha-numeric.
2) The "GG" ALWAYS has at least 20 characters before it that are NOT those two.
3) The file is not enormous.

In this example I have deliberately inserted GGs inside the 22 character bounderies to
show the possible error that could result.

Code:

#!/bin/bash --posix
echo "1234567890qwertyuiopasdfghjklzxcvbnmGGMNBVCXZLKJHGFDSAPOIUYTREWQ0987654321GG1234567890GGABCDEFGGHIJ" > /tmp/flatfile
read textfile < /tmp/flatfile
echo ""
echo "$textfile"
echo ""
for n in $( seq 0 1 ${#textfile} )
do
	if [ "${textfile:$n:2}" == "GG" ]
		then echo "${textfile:$[ ( $n - 20 ) ]:22}"
	fi
done
echo ""

And the display on OSX 10.7.5 default bash terminal:-

Code:

Last login: Sun Sep 15 18:17:17 on ttys000
AMIGA:barrywalker~> chmod 755 flatfile.sh
AMIGA:barrywalker~> ./flatfile.sh

1234567890qwertyuiopasdfghjklzxcvbnmGGMNBVCXZLKJHGFDSAPOIUYTREWQ0987654321GG1234567890GGABCDEFGGHIJ

uiopasdfghjklzxcvbnmGG
POIUYTREWQ0987654321GG
87654321GG1234567890GG
GG1234567890GGABCDEFGG

AMIGA:barrywalker~> _

NOTE:- The "GG"s inside 22 characters also include earlier "GG"s!

wisecracker

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LEARN ABOUT OPENSOLARIS

echo

echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME

       echo, noecho - enable/disable terminal echo

SYNOPSIS

       cc [ flag... ] file... -I /usr/xpg4/include  -L	/usr/xpg4/lib 
	-R  /usr/xpg4/lib  -lcurses  [ library... ]

       c89 [ flag... ] file... -lcurses [ library... ]

       #include <curses.h>

       int echo(void);

       int noecho(void);

DESCRIPTION

       The  echo()  function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially,
       curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control  soft-
       ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined.

RETURN VALUES

       Upon successful completion, these functions return OK. Otherwise, they return ERR.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5)

SunOS 5.11							    5 Jun 2002							    echo(3XCURSES)

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