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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
Old 04-12-2020
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...
 

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CUBRID_REAL_ESCAPE_STRING(3)						 1					      CUBRID_REAL_ESCAPE_STRING(3)

cubrid_real_escape_string - Escape special characters in a string for use in an SQL statement

SYNOPSIS
string cubrid_real_escape_string (string $unescaped_string, [resource $conn_identifier]) DESCRIPTION
This function returns the escaped string version of the given string. It will escape the following characters: '. In general, single quo- tations are used to enclose character string. Double quotations may be used as well depending on the value of ansi_quotes, which is a parameter related to SQL statement. If the ansi_quotes value is set to no, character string enclosed by double quotations is handled as character string, not as an identifier. The default value is yes. If you want to include a single quote as part of a character string, enter two single quotes in a row. PARAMETERS
o $unescaped_string -The string that is to be escaped. o $conn_identifier - The CUBRID connection. If the connection identifier is not specified, the last connection opened by cubrid_connect(3) is assumed. RETURN VALUES
Escaped string version of the given string, on success. FALSE on failure. EXAMPLES
Example #1 cubrid_real_escape_string(3) example <?php $conn = cubrid_connect("localhost", 33000, "demodb"); $unescaped_str = ' !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`abcdefghijklmnopqrstuvwxyz{|}~'; $escaped_str = cubrid_real_escape_string($unescaped_str); $len = strlen($unescaped_str); @cubrid_execute($conn, "DROP TABLE cubrid_test"); cubrid_execute($conn, "CREATE TABLE cubrid_test (t char($len))"); cubrid_execute($conn, "INSERT INTO cubrid_test (t) VALUES('$escaped_str')"); $req = cubrid_execute($conn, "SELECT * FROM cubrid_test"); $row = cubrid_fetch_assoc($req); var_dump($row); cubrid_close_request($req); cubrid_disconnect($conn); ?> The above example will output: array(1) { ["t"]=> string(95) " !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`abcdefghijklmnopqrstuvwxyz{|}~" } PHP Documentation Group CUBRID_REAL_ESCAPE_STRING(3)
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