linux - Command not found in Bash's IF-ELSE condition when using [! -d "$DIR"] -


i have code 

#!/bin/bash  dir="test_dir/"; if [! -d "$dir"];     # if doesn't create     mkdir $dir fi

but why executing gave me this:

./mycode.sh: line 16: [!: command not found

what's right way it?

add space between [ , !. , before ] well.

#!/bin/bash  dir="test_dir/"; if [ ! -d "$dir" ];     # if doesn't create     mkdir $dir fi

it's idea quote variable:

    mkdir "$dir"

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