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Top Forums UNIX for Dummies Questions & Answers Reading character by character - BASH Post 302568815 by sluvah on Friday 28th of October 2011 09:53:54 AM
Old 10-28-2011
Reading character by character - BASH

Hello every one and thanks in advance for the time you will take to think about my problem.

I would like to know if it's possible (in BASH) to read a text file character after character.

Exactly this is what I would like to do :


Txt file : ATGCAGTTCATTGCCAAA...... (~2.5 millions characters)

First letter is A ==> increment $A by one
Second letter is T ==> increment $T by one
....

Then, do the same for 2 letters' groups... 3 letters' groups and so on.

Is it possible in BASH or should I try an other language ? (in this case, wich one ?)

Thank you,
Sluvah.
 

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Tcl_UniCharIsAlpha(3)					      Tcl Library Procedures					     Tcl_UniCharIsAlpha(3)

__________________________________________________________________________________________________________________________________________________

NAME
Tcl_UniCharIsAlnum, Tcl_UniCharIsAlpha, Tcl_UniCharIsControl, Tcl_UniCharIsDigit, Tcl_UniCharIsGraph, Tcl_UniCharIsLower, Tcl_UniCharIsPrint, Tcl_UniCharIsPunct, Tcl_UniCharIsSpace, Tcl_UniCharIsUpper, Tcl_UniCharIsWordChar - routines for classification of Tcl_UniChar characters SYNOPSIS
#include <tcl.h> int Tcl_UniCharIsAlnum(ch) int Tcl_UniCharIsAlpha(ch) int Tcl_UniCharIsControl(ch) int Tcl_UniCharIsDigit(ch) int Tcl_UniCharIsGraph(ch) int Tcl_UniCharIsLower(ch) int Tcl_UniCharIsPrint(ch) int Tcl_UniCharIsPunct(ch) int Tcl_UniCharIsSpace(ch) int Tcl_UniCharIsUpper(ch) int Tcl_UniCharIsWordChar(ch) ARGUMENTS
int ch (in) The Tcl_UniChar to be examined. _________________________________________________________________ DESCRIPTION
All of the routines described examine Tcl_UniChars and return a boolean value. A non-zero return value means that the character does belong to the character class associated with the called routine. The rest of this document just describes the character classes associated with the various routines. Note: A Tcl_UniChar is a Unicode character represented as an unsigned, fixed-size quantity. CHARACTER CLASSES
Tcl_UniCharIsAlnum tests if the character is an alphanumeric Unicode character. Tcl_UniCharIsAlpha tests if the character is an alphabetic Unicode character. Tcl_UniCharIsControl tests if the character is a Unicode control character. Tcl_UniCharIsDigit tests if the character is a numeric Unicode character. Tcl_UniCharIsGraph tests if the character is any Unicode print character except space. Tcl_UniCharIsLower tests if the character is a lowercase Unicode character. Tcl_UniCharIsPrint tests if the character is a Unicode print character. Tcl_UniCharIsPunct tests if the character is a Unicode punctuation character. Tcl_UniCharIsSpace tests if the character is a whitespace Unicode character. Tcl_UniCharIsUpper tests if the character is an uppercase Unicode character. Tcl_UniCharIsWordChar tests if the character is alphanumeric or a connector punctuation mark. KEYWORDS
unicode, classification Tcl 8.1 Tcl_UniCharIsAlpha(3)
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