Until Loop in Shell Script.

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1. The until loop is similar to while loop in shell scripting. But the major difference in two of them is
2. Until loop executes the statement executes its code-block while its conditional expression is false,
3. While loop statement executes its code block while its conditional expression is true.

The syntax for until expression is:

syntax
until expression
do
    command1
    command2
    command3
    .
    .
    .
    commandN
done

The above syntax indicates
until do and done are keywords
expression is any conditional expression (termed here to be false)

filename: main.sh
Let us review one example for until loop.

until [[ $var -le 6 ]]
do
    echo "Variable: $var"
    (( var++ ))
done

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Regards
Niraj Bhagchandani.