The read command with -r; any good examples?

[goldenradium2001]

I'm trying to learn Korn shell scripting and I've got five different books quoting the man page for the read command using the -r option. What's the point in using the -r option? Can anyone give me a good example?

THanks in advance.

 

[DSMARWAY]

hi

have a look at this ,

if you have a file called AAA
in it it has

/aaa /bbb
\ccc \ddd

note forward slash for aaa +bbb and back slash for
ccc+ddd


if you do this :-

while read aa bb
do
printf "%s %s \n" "$aa" "$bb"
done < /tmp/AAA


you'll get following output
/bbb /aaa
ddd ccc

note no black slashes displayed

with the -r option from read used you'll get the backslash displayed

/bbb /aaa
\ddd \ccc

To use this , may be the ourput required from the input file would be a backslash , depending on how ou want your output displayed .

HTH