Strings

There are 3 types of strings:-

Double quoted strings

Double quoted strings are treated as literals i.e. just a set of characters except any variables are replaced by their values. For example:-

var="abc"
echo "var = $var"

produces:-

var = abc

Single quoted strings

Single quoted strings are treated as literals i.e. just a set of characters and variables are not replaced by their values. For example:-

var="abc"
echo 'var = $var'

produces:-

var = $var

Back quoted strings

The contents of a back quoted string are executed as a command and the output from it is returned as the value of the string. For example:-

var=`hostname`
echo "var = $var"

produces:-

var = pplxint9

if run on PPLXINT9.