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tcsh vs ksh 93u+m: catalog facts
tcsh	ksh 93u+m
Best for: Users and admins who work with csh-style shells and scripts	Best for: Maintaining KornShell scripts or using ksh as a daily shell
Free Free and open source.	Free Free and open source.
macOS, Linux, Command line	macOS, Linux, Command line
Compatible with the C shell Command-line editing and completion All 3 strengths for tcsh Compatible with the C shell Command-line editing and completion Long-established on Unix systems	Keeps the original KornShell 93 alive with ongoing fixes Compatible with existing ksh93 scripts All 3 strengths for ksh 93u+m Keeps the original KornShell 93 alive with ongoing fixes Compatible with existing ksh93 scripts Published releases plus a development branch
csh-style syntax differs from bash and other POSIX shells Smaller plugin and configuration ecosystem than zsh	Mainly distributed as source code Smaller community than Bash or Zsh
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License not stated
No account needed	No account needed
Offline features available	Offline features available
Official website Full listing and sources Sources for tcsh github.com/tcsh-org/tcsh Catalog checked October 2, 2026	Official website Full listing and sources Sources for ksh 93u+m github.com/ksh93/ksh Catalog checked October 1, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.