Capture carriage return.

Shell Programming and Scripting
1

I try to test the carriage return in a variable.
$ LENGTH=`expr $VARIABLE : ".*"` will return the length of the variable. But this doesn't work if $VARIABLE has zero length.

Any help will be well appreciated.
Thanks in advance.

 Giovanni
2

# VAR="adfadf"; LENGTH=`expr "$VAR" : '.*'`; echo $LENGTH

I doubt whether your syntax is correct, just use the above it will work correctly

If you want to get 0 for null string put VAR=""

Cheers

3

You can try this way also if you want as a single command to be executed one at a time

# export VAR="adafadfadf"
# export LENGTH=`expr "$VAR" : '.'`
# echo $LENGTH
10
# export VAR=""
# export LENGTH=`expr "$VAR" : '.'`
# echo $LENGTH
0
#

Regards

4

Also see the syntax

LENGTH=${#VARIABLE}

5

You could also use awk:

var="adfadf"
echo $var | awk '{print length($0)}