#/bin/bash --posix
# Remove "'" DEMO.
yourtext="abcn'
jkdjf 
dkfjd'"
echo -n "$yourtext" > /tmp/text
text=$(cat < /tmp/text)
# This line is not needed.
echo "$text"
newtext=""
decimal=0
subscript=0
length=$[ ( ${#text} - 1 ) ]
# This line is not needed.
echo "${#text}"
while [ $subscript -le $length ]
do
	decimal=`printf "%d" \'${text:$subscript:1}`
	if [ $decimal -eq 39 ]
	then
		subscript=$[ $subscript + 1 ]
	else
		newtext=$newtext${text:$subscript:1}
		subscript=$[ $subscript + 1 ]
	fi
done
# Print the final string...
echo "$newtext"
# This linbe is not needed...
echo "${#newtext}"
# These two lines added to show the _invisible_ characters are preserved and are not needed.
echo -n "$newtext" > /tmp/text
hexdump -C /tmp/text
# DEMO end.

Last login: Wed Nov  6 19:44:44 on ttys000
AMIGA:barrywalker~> ./remove_quote.sh
abcn'
jkdjf 
dkfjd'
19
abcn
jkdjf 
dkfjd
17
00000000  61 62 63 6e 0a 6a 6b 64  6a 66 20 0a 64 6b 66 6a  |abcn.jkdjf .dkfj|
00000010  64                                                |d|
00000011
AMIGA:barrywalker~> _