Strings are not quoted for 'expr' itself, though you might need to quote them to protect characters with special meaning to the shell, e.g., spaces. Operators can be given as infix symbols or prefix keywords. P
test command or [ expr ] is used to see if an expression is true, and if it is true it return zero(0), otherwise returns nonzero for false. Syntax: test expression OR [ expression ] Example: Following script determine whether given argument number is positive. $ cat > ispostive #!/b...
test command or [ expr ] is used to see if an expression is true, and if it is true it return zero(0), otherwise returns nonzero for false. Syntax: test expression OR [ expression ] Example: Following script determine whether given argument number is positive. $ cat > ispostive #!/b...