Doesn't sh support process substitution <(…)?

Question

On a Centos 6 machine, this works:

bash -c \'if grep -qP --line-buffered \".+\" <(tail -n 1000 -F catalina.out) ; then echo \"yes\"; fi\'

<

Answer 1

The syntax <(...) is only supported by BASH.

For any POSIX shell, use this approach:

sh -c 'tail -n 1000 -F catalina.out | if grep -qP --line-buffered ".+" ; then ...'

i.e. move the stdin redirection in front of the if with a pipe. The if will pass stdin on to the grep.

if tail ...| grep won't work since the if won't be able to see it's then/fi because the pipe separates processes.