What does expr mean in shell script?
What does expr mean in shell script? expr is a command line utility on Unix and Unix-like operating systems which evaluates an expression and outputs the corresponding value. How do you use expr in shell? read a. read b. sum=`expr $a + $b` echo "Sum = $sum"...To find the length of a string, let's take a string 'ALPHABET. ' Execute the following commands to find the length of the given string:a=hellob=`expr length $a`echo $b. What is shell variable syntax? A shell variable is a variable that is available only to the current shell. In contrast, an environment variable is available...