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Appendix B Reference Lists |
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B.5 Options
These are options that can be turned on with the set -o command. All are initially off except where noted. Abbrev s, where listed, are arguments to set that can be used instead of the full set -o command (e.g., set -a is an abbreviation for set -o allexport ). The abbreviations are actually backward-compatible Bourne shell options.
| Option | Abbrev | Meaning |
|---|---|---|
| allexport | -a | Export all subsequently defined variables. |
| errexit | -e | Exit the shell when a command exits with non-0 status. |
| bgnice | Run all background jobs at decreased priority (on by default). |
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| emacs | Use emacs-style command-line editing. | |
| gmacs | Use emacs -style command-line editing, but with a slightly different meaning for [CTRL-T] (See Chapter 2, Command-line Editing ). |
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| ignoreeof | Disallow [CTRL-D] to exit the shell. | |
| markdirs | Add / to all directory names generated from wildcard expansion. |
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| monitor | -m | Enable job control (on by default). |
| noclobber | Don't allow > redirection to existing files. | |
| noexec | -n | Read commands and check for syntax errors, but don't execute them. |
| noglob | -f | Disable wildcard expansion. |
| nolog | Disable command history. | |
| nounset | -u | Treat undefined variables as errors, not as null. |
| privileged | -p | Script is running in suid mode. |
| trackall | -h | Substitute full pathnames for commands in alias expansions. |
| verbose | -v | Print commands (verbatim) before running them. |
| vi | Use vi -style command-line editing. | |
| viraw | Use vi mode and have each keystroke take effect immediately. |
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| xtrace | -x | Print commands (after expansions) before running them. |
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| B.4 Test Operators | 
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B.6 Typeset Options |
