How to syntax check portable POSIX shell scripts? [duplicate]

Answer 1

With bash you can use -n:

bash -n file.sh

Output:

a.sh: line 3: syntax error near unexpected token `then'
a.sh: line 3: `if then fi # Something with syntax error'

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Since bash supports the --posix options you may run

bash --posix -n file.sh

to perform a posix compatible check. I don't know how posixly correct that mode is in detail.