I haven’t found a way to print a file to stdout with either execline nor s6-portable-utils. The `s6-cat` utility only echoes stuff that is already coming from stdin, and unlike the shell, execline doesn’t have `<`.
https://skarnet.org/software/execline/redirfd.html "redirfd -r 0 $file s6-cat" will print $file to stdout. -- Laurent
