exercises shell script

see also http://www.basiclinuxcommand.com/linux-command/shopt.html for linux command shopt

Aliases are not expanded when the shell is not interactive, unless the expand_aliases option is set using the shopt shell built-in.

The following string operators are supported by Bourne Shell.

Assume variable a holds "abc" and variable b holds "efg" then −

Operator Description Example = Checks if the value of two operands are equal or not; if yes, then the condition becomes true. [ $a = $b ] is not true. != Checks if the value of two operands are equal or not; if values are not equal then the condition becomes true. [ $a != $b ] is true. -z Checks if the given string operand size is zero; if it is zero length, then it returns true. [ -z $a ] is not true. -n Checks if the given string operand size is non-zero; if it is nonzero length, then it returns true. [ -n $a ] is not false. str Checks if str is not the empty string; if it is empty, then it returns false. [ $a ] is not false.

See also: http://www.tutorialspoint.com/unix/unix-string-operators.htm

Array displaying wrong names and wrong number of array elemts could be corrected with following code

-get length of the array

ArrayLenght=${#PLAYERS[@]}

-Loop to display all player names

for (( i=0; i<$ArrayLenght; i++ )); do echo "Hello ${PLAYERS[$i]}. Good Luck for the football game!" done