(or any other option)

#!/bin/ksh
set --default

Switch to a shell that supports these options, such as Ksh:

#!/bin/ksh
set --default

Your script uses a shell feature not supported by the shebang. Either rewrite the script to be portable, or change the shebang to explicitly require a shell like Ksh.

Most shell specific set flags are hard to emulate in POSIX, so use your best judgement as to whether you can make do without them, or if you should require a shell that supports them.

None

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