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In other shells, the status of the pipeline is the exit status of the last process, so in this case that would be head which exits with 0.

• aidenn0 1y ago
  Not in e.g. bash with "pipefail" set. However the pipefail option in bash will choke on my previous example, hence treating a SIGPIPE the same as success in ysh.
  • mprovost 1y ago
    Yes well, the pipefail option configures bash to do the opposite of its usual behaviour.