Date: Mon, 28 Feb 2022 13:47:21 +0000 From: bugzilla-noreply@freebsd.org To: standards@FreeBSD.org Subject: [Bug 46441] sh(1): Does not support PS1, PS2, PS4 parameter expansion Message-ID: <bug-46441-99-FgzL6djQcG@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-46441-99@https.bugs.freebsd.org/bugzilla/> References: <bug-46441-99@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D46441 --- Comment #12 from Jilles Tjoelker <jilles@FreeBSD.org> --- For PS4, I implemented this in 2011. The problem with unbounded recursion f= rom command substitutions is avoided by not allowing command substitutions; this error (like other parse and expansion errors in PS4) is handled by writing = an error message and continuing with the unexpanded value. For PS1 and PS2, there are two additional problems: * how does $... expansion interact with the existing \u, \w, \$, etc. * because PS2 is needed during the middle of a parse, more work may be need= ed to prevent the two parse operations from interfering with each other --=20 You are receiving this mail because: You are on the CC list for the bug.=
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