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Drawer: Ghost variables
Parameters nobody declares and every shell carries.
7 insects on this page
- BSH-019 $_ The previous command's last argument, kept in an underscore. Ghost variables uncommon
- BSH-020 $? The last command's exit status: zero is good silence. Ghost variables common
- BSH-021 $$ The shell's own process number — the session's registration. Ghost variables common
- BSH-022 $! The PID of the last process sent to the background. Ghost variables uncommon
- BSH-023 $0 The name the script was called by — itself, on the label. Ghost variables common
- BSH-024 $- The shell's lit options, one letter per flag. Ghost variables forgotten
- BSH-025 $PIPESTATUS The exit status of every link in the pipe, not just the last. Ghost variables forgotten