bug#39999: BSD sed vs Gnu sed

Greg Troxel <[email protected]>
Newsgroups gmane.lisp.guile.bugs
Message-ID <[email protected]>
"W. Lincoln Harvey" via "Bug reports for GUILE, GNU's Ubiquitous
Extension Language" <[email protected]> writes:

> backup file, BSD sed’s -i option requires a zero-length string as a
> mandatory argument, while Gnu sed’s -i option does not take any
> argument.

In cases like this, it is good to read the POSIX specs.

However, you will find that -i is not specified at all.

https://pubs.opengroup.org/onlinepubs/9699919799/utilities/sed.html
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