Without the aid of the escape mechanism, how to put a raw string into a variable? Post: 303045751

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Top Forums UNIX for Advanced & Expert Users Without the aid of the escape mechanism, how to put a raw string into a variable? Post 303045751 by wisecracker on Sunday 12th of April 2020 05:23:57 AM

04-12-2020

Registered User

Without the aid of the escape mechanism, how to put a raw string into a variable?

Hi guys and gals...
I have been racking my brains with this one and I can't find anything about it...
Consider the code and the results below:

Code:

#!/usr/local/bin/dash

# #!/bin/sh
# #!/bin/bash
# rawstring.sh

: > /tmp/rawstring

# ############# THIS WORKS ADMIRABLY! ##############
NUM=32
STRING=""

while [ ${NUM} -le 126 ]
do
    printf \\$( printf "%03o" "${NUM}" ) >> /tmp/rawstring
    NUM=$(( NUM + 1 ))
done

STRING=$( cat /tmp/rawstring )
echo ""
/bin/echo "${STRING}"
echo ""
echo "${STRING}"
# ########## END OF THIS WORKS ADMIRABLY! ##########

# ##################################################
# THIS HOWEVER FAILS CATASTROPHICALLY!
echo ""
echo "This is where the error is with or without leading and trailing"
echo "single or double quotes:-"
echo ""

STRING=' !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~'

# The line below does not even get executed!
echo "${STRING}"
# ##################################################

Results on OSX 10.14.x:

Code:

Last login: Sun Apr 12 09:52:48 on ttys000
AMIGA:amiga~> cd Desktop/Code/Shell
AMIGA:amiga~/Desktop/Code/Shell> ./rawstring.sh

 !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~

 !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~

This is where the error is with or without leading and trailing
single or double quotes:-

./rawstring.sh: 33: ./rawstring.sh: Syntax error: "(" unexpected
 AMIGA:amiga~/Desktop/Code/Shell> _

As you can see saving a rawstring to disk and retrieving it again works but trying to force a rawstring without the escape mechanism fails catastrophically.
This is one of the USEFUL uses of 'cat' as it works admirably in this case but it requires I/O to do so...
I need to avoid the use of the escape mechanism inside the failing condition in case I want to __edit__ said rawstring inside any code.

I would like to know what is different about putting a rawstring into a variable using 'cat' and attempting to do so using hard coding.

Bazza...

wisecracker

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ECHO(1) 							   User Commands							   ECHO(1)

NAME

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SYNOPSIS

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DESCRIPTION

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AUTHOR

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