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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LEARN ABOUT PLAN9

tr

TR(1)							      General Commands Manual							     TR(1)

NAME

       tr - translate characters

SYNOPSIS

       tr [ -cds ] [ string1 [ string2 ] ]

DESCRIPTION

       Tr  copies  the standard input to the standard output with substitution or deletion of selected characters (runes).  Input characters found
       in string1 are mapped into the corresponding characters of string2.  When string2 is short it is padded to the length of string1 by  dupli-
       cating its last character.  Any combination of the options -cds may be used:

       -c     Complement string1: replace it with a lexicographically ordered list of all other characters.

       -d     Delete from input all characters in string1.

       -s     Squeeze repeated output characters that occur in string2 to single characters.

       In  either  string a noninitial sequence -x, where x is any character (possibly quoted), stands for a range of characters: a possibly empty
       sequence of codes running from the successor of the previous code up through the code for x.  The character followed by 1,  2  or  3  octal
       digits  stands for the character whose 16-bit value is given by those digits.  The character sequence followed by 1, 2, 3, or 4 hexadecimal
       digits stands for the character whose 16-bit value is given by those digits.  A followed by any other character stands for that character.

EXAMPLES

       Replace all upper-case ASCII letters by lower-case.

	      tr A-Z a-z <mixed >lower

       Create a list of all the words in one per line in where a word is taken to be a maximal string of  alphabetics.	 String2  is  given  as  a
       quoted newline.

	      tr -cs A-Za-z '
	      ' <file1 >file2

SOURCE

       /sys/src/cmd/tr.c

SEE ALSO

       sed(1)

																	     TR(1)

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