Chet Ramey wrote: > r...@saturn.syslang.net wrote: > >> Description: >> use of $(< filename | program) does not work. It either should or it >> should be properly documented. The problem also happens on bash4. >> >> Repeat-By: >> >> qq=$(< /etc/passwd | grep sys) >> echo $qq >> # result is null >> >> Fix: >> Either fix the docs to tell people that a pipe is not allowed or fix the >> code to allow it. > > That construct is very limited. As the bash man page says: > > The command substitution $(cat file) can be replaced by the equivalent > but faster $(< file). > > That seems pretty clear.
Yeah, and then based on that he probably thought that $(cat file | grep sys) could be replaced by $(< file | grep sys) which is not the case.
