OT: sed + exit status

[Dimitar Vasilev]

>
>
>        .  Is sed "successful" is there are no instances of FOO?  Or
> only if there is at least one instance of FOO and it is successfully
> replaced by bar?
>
>        Respectfully,
>
>
>                                        Robert Huff
>
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Hi Robert,
try to use truss or strace to see the exit codes in both cases.