CODEWITHSUNDEEP
bashsetdouble-quotes
showkey
showkey

Reputation: 298

set -- arguments with $string and "$string"

Compare $string and "$string":

string="xx yy zz"
if [[ $string == "$string" ]]; then
    echo "Strings are equal."
else
    echo "Strings are not equal."
fi

We get:Strings are equal.

set  -- $string
echo $#
3

To set arguments with $string get 3 arguments.

set  -- "$string"
echo $#
1

To set arguments with "$string" get 1 argument.
What result in this difference?

Upvotes: -1

Views: 85

Answers (1)

KamilCuk
KamilCuk

Reputation: 141698

This difference results because [[ is super very very magic. it is a syntatic sugar in bash handled when parsing the input, not a real command. Inside [[ qoutes have slightly different meaning depending on context. In the case of == , qoutes can be omited, so the strings are equal.

In contrast, the [ or test is a normal command. You can check how the following fails:

[ $string == "$string" ]

Upvotes: 1

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