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Top Forums UNIX for Dummies Questions & Answers Need help with repeating variables in a shell script Post 302760697 by ricco19 on Thursday 24th of January 2013 12:17:11 PM
Old 01-24-2013
Need help with repeating variables in a shell script

I should preface this by saying I have never worked with shell scripts before so this is all new to me. I was able to make something that worked, but is terribly optimized, and I have no idea how to improve it. If anything it's a pretty hilarious script:

Code:
   #/bin/bash
    
    get_char() {
    	old_tty_settings=`stty -g`
    	stty -icanon min 0 time 1
    	stty cbreak
    	grabbed_char=`dd if=/dev/tty bs=1 count=1 2>/dev/null`
    	stty -cbreak
    	stty "$old_tty_settings"
    }
    
    while true; do
    
    	unset char00
    	unset char01
    	unset char02
    	unset char03
    	unset char04
    	unset char05
    
    	echo -e "\nWaiting for keystroke..."
    	read -n 1 char00
    
    	while true; do
    
    		get_char; char01=$grabbed_char
    
    		if [ "$char01" != "" ]; then get_char; char02=$grabbed_char
    			else break
    		fi
    		if [ "$char02" != "" ]; then get_char; char03=$grabbed_char
    			else break
    		fi
    		if [ "$char03" != "" ]; then get_char; char04=$grabbed_char
    			else break
    		fi
    		if [ "$char04" != "" ]; then get_char; char05=$grabbed_char
    			else break
    		fi
    
    	done
    
    	fullstring=$char00$char01$char02$char03$char04$char05
    	echo -e "\nFULLSTRING:	!$fullstring!"
    
    done


The list is a lot longer, but I spared you.

Basically, the program needs to sit in terminal forever waiting for a keystroke. After an initial keystroke, it needs to wait a very short amount of time (1/10th of a second in this case) for another keystroke. If no keystroke is registered in that short time, it echos the output (which will be piped with sed commands), and restarts.

It is meant to be used with a barcode scanner, where you may scan 4 characters, or 100 characters. We want to process the data as quickly as possible, meaning we don't want a 1 second delay after something is scanned.

A good solution would be if "charXX" could be created as a character was received. Thanks for any help.
 

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platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME
platform::shell - System identification support code and utilities SYNOPSIS
package require platform::shell ?1.1.4? platform::shell::generic shell platform::shell::identify shell platform::shell::platform shell _________________________________________________________________ DESCRIPTION
The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell. This package allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only requirement is that the other shell (identified by its path), is actually executable on the current machine. While for most platform this means that the architecture of the interrogated shell is identical to the architecture of the running shell this is not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run 32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers. For applications like a code repository it is important to identify the architecture of the shell which will actually run the installed packages, versus the architecture of the shell running the repository software. COMMANDS
platform::shell::identify shell This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell. platform::shell::generic shell This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell. platform::shell::platform shell This command returns the contents of tcl_platform(platform) for the specified Tcl shell. KEYWORDS
operating system, cpu architecture, platform, architecture platform::shell 1.1.4 platform::shell(n)
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