The remote file reads ran under the user's login shell, quoted for a POSIX
one. Under fish the probe was a parse error, so previews failed, and csh and
tcsh failed every multi-line read. Wrapping the probe in sh -c as the review
proposed would have opened a hole: fish reads \' inside single quotes as a
quote, so nested shell quoting flips, and a path holding ';touch x;' ran
touch x (measured, also on the existing folder listing). csh and tcsh run a
multi-line command line by line, so a newline in a path did the same.
buildRemoteFileCommand now sends every script as one word of printf text
with those bytes in octal, and only sh reads it. Probe, folder listing, read,
range read and transcript lookup gave the same result under bash, zsh, dash,
fish, tcsh and csh in a throwaway container ($SHELL -c, no real sshd), and 24
hostile paths ran nothing. Plain csh caps a word near 8 KB, noted in the docs.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Codeman maintainer
82593a4dd6