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

Also take note that if Bash is invoked with the name sh, it tries to mimic the startup behavior of historical versions of sh as closely as possible, while conforming to the POSIX standard as well.

If your sh is actually a link to bash, then this is what's causing that.

Running sh --version; sh -c ': <(echo a)' should give you enough info.