shell read built-in

[Yuri Pankov]

Eugene Grosbein wrote:
> Hi!
> 
> $ echo test | read line; echo $?
> 0
> $ echo -n test | read line; echo $?
> 1
> 
> Is it right behavior for /bin/sh?
> This makes it hard for "while read line ... < file"
> to process last line if it is not followed by new line character.

POSIX defines the exit status for read as (and sh(1) says the same):

    The following exit values shall be returned:
     0 Successful completion.
    >0 End-of-file was detected or an error occurred.

...and looks like all of /bin/sh, bash, ksh93 seem to agree on the
behavior here.