You can use mkdir -p option to create a new directory if does not already exist.
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## Create a new directory mkdir mydir1 ## Try to create a new directory with same name mkdir mydir1 ## mkdir: cannot create directory ‘mydir1’: File exists ## With -p option mkdir -p mydir1 ## no error reported ## you can also create chain of directory at once using -p option mkdir -p mydir1/mydir2/mydir3 rm -r mydir1 |