declare command one liners

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Command declare is used to set variable and functions attributes.

1.       Create a constant variable

A constant variable is a variable that is always constant in the experiment, it never changes.

declare -r var

declare -r varName=value

declare -r pwdfile=/etc/passwd

echo $pwdfile

pwdfile=/etc/foo.txt

2.       Create an integer variable

An integer data type (variable) is any type of number without a fractional part.

declare -i var

declare -i varName=value

declare -i y

y=10

[ $y -eq 0 ] && echo "Y is set to a zero number." || echo "Y is set to a nonzero number."

y="foo"

[ $y -eq 0 ] && echo "Y is set to a zero number." || echo "Y is set to a nonzero number."

3.       Create an array

declare -a arrayname=(element1 element2 element3)

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