Duplicate of https://bugs.launchpad.net/mksh/+bug/1783355
** Changed in: mksh Status: New => Invalid -- You received this bug notification because you are a member of mksh Mailing List, which is subscribed to mksh. Matching subscriptions: mkshlist-to-mksh-bugmail https://bugs.launchpad.net/bugs/1855606 Title: Can't parse command substitution containing here-document and pipeline Status in mksh: Invalid Bug description: This scriptlet, boiled down from production code, fails with "syntax error: '|' unexpected": a=$(cat <<EOF | cat hello EOF ) [ "$a" = hello ] The following variation fails in the same way: a=$(cat <<EOF | hello EOF cat ) [ "$a" = hello ] Those scriptlets work in ksh93, ksh88 (AIX and Solaris), bash, and even pdksh 5.2.14 (RHEL 4). I've reproduced the failures in mksh R56 (RHEL 8) and R46 (RHEL 7). It's the combination of $( ), here-document, and pipeline that provokes the bug. Take away one of those elements, and there's no trouble. To manage notifications about this bug go to: https://bugs.launchpad.net/mksh/+bug/1855606/+subscriptions