Options
These are options that can be turned on with the set -o command. All are initially off except where noted. Abbrevs, 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). | |
| emacs | Use emacs-style command-line editing. | |
| gmacs | Use emacs-style command-line editing, but with a slightly different meaning for [CTRL-T] (See Command-line Editing). | |
| ignoreeof | Disallow [CTRL-D] to exit the shell. | |
| markdirs | Add / to all directory names generated from wildcard expansion. | |
| 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. | |
| xtrace | -x | Print commands (after expansions) before running them. |