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* shell: non-interactive mode exits non-zero when a command fails A failed command in a piped weed shell run printed 'error: ...' but the process still exited 0, so a CronJob wrapping e.g. echo 's3.lifecycle.run-shard -shards 0-15' | weed shell -master=... reported green while the run aborted partway (shards N+1..15 unwalked). An unknown command likewise exited 0. RunShell now returns the last command failure from the non-interactive stdin path (unknown commands included), and the shell command exits 2 on it. Interactive sessions are unchanged: errors are shown to the operator and the session continues, exiting 0 as before. * shell: route the piped-failure exit through main's shutdown path Review follow-up: os.Exit(2) inside the shell command skipped main's shutdown work. The command now records the status (SetCommandExitStatus) and returns normally; main applies it via setExitStatus before exit(). exit() itself now flushes sentry before os.Exit -- main's deferred sentry.Flush never ran on this path (os.Exit skips defers), so the existing 'flush buffered events before the program terminates' intent only worked for the autocomplete early-return. Exit status 2 on a failed piped run is preserved (verified: piped success exits 0, piped failing command exits 2). * shell: test the registered-command failure path Review follow-up: the error-propagation test only covered unknown commands. A fake registered command now drives processEachCmd's real dispatch path: a failing Do surfaces its exact error (errors.Is) and a succeeding one returns nil. The non-interactive exit status itself is main-level plumbing, verified end to end against the reproduction (piped failure exits 2). * shell: trim the comments added with the exit status Keep the non-obvious why -- why a piped run has to fail its wrapper, why the status is recorded instead of os.Exit'ed -- and drop the narration. Claude-Session: https://claude.ai/code/session_018DWwctzD4T2DmnczPRM47t * shell: fail a piped run with the status weed already uses for that weed.go spends 1 on a command that failed and 2 on a usage or syntax error, and runShell returns true precisely so the usage dump is skipped. Exiting 2 there told a wrapper the command line was wrong. Claude-Session: https://claude.ai/code/session_018DWwctzD4T2DmnczPRM47t --------- Co-authored-by: Carlos Leyva <carlos.leyva@idener.es>