Bash shell-set bash options with built-in set and SHOPT commands

Set bash options with built-in set and SHOPT commands

The set command can be used to customize the shell environment, using the option "O" to turn options on or off. For example, open the options: Set-o option, close the Select item: Set +O option.

For example, to open the VI Interactive command-line edit, the following:

[Email protected] ~]#Set-o#查看当前设置情况 Allexport off Braceexpand on Emacs on Errexit off Errtrace off Functrace off Hashall on Histexpand on History on Ignoreeof off Interactive-comments on Keyword off Monitor on Noclobber off Noexec off Noglob off Nolog off Notify off Nounset off Onecmd off Physical off Pipefail off POSIX off Privileged off Verbose off VI off#关闭中 Xtrace off [Email protected] ~]#Set-o VI#把vi选项打开 [Email protected] ~]#Set-o#查看当前设置情况 Allexport off Braceexpand on Emacs off Errexit off Errtrace off Functrace off Hashall on Histexpand on History on Ignoreeof off Interactive-comments on Keyword off Monitor on Noclobber off Noexec off Noglob off Nolog off Notify off Nounset off Onecmd off Physical off Pipefail off POSIX off Privileged off Verbose off VI on#已经打开 Xtrace off

Built-in SET command options

Option name	Quick Switch	Meaning
Allexport	-A	Starting with this option, the new variable or modified variable to be output is automatically marked until the option is reset
Braceexpand	-B	Open curly brace extension, which is a default setting
Emacs		command line editing using the Emacs built-in editor is a default setting
Errexit	-E	Exits when the command returns a non-0 exit state (failed). Do not set when reading initialization file
Histexpand	-H	Perform history replace when open!!! Extension, is a default setting
History		Open command-line history, open by default
Ignoreeof		Disable the use of the EOF (CTRL+D) key to exit the shell. You must type exit to exit. Equivalent to setting the shell variable ignoreeof=10
Keyword	-K	Place keyword arguments in the environment of the command
Interactive-comments		For interactive shells, use the text after the # symbol as a comment
Monitor	-M	Set up Job control
Noclobber	-C	Prevent files from being rewritten when redirected
Noexec	-N	Read the command, but do not execute it. The syntax used to check the script. Interactive runtime does not open
Noglob	-D	Extension with pathname is forbidden. The wildcard character is turned off
Notify	-B	Notifies the user when a background job completes
Nounset	-U	An error message appears when you extend an undefined variable
Onecmd	-T	Exit after reading and executing commands
Physical	-P	When set, type the CD or PWD Forbidden symbolic link. Replace with a physical directory
Privileged	-P	When set, the shell does not read the. Profile or env file, and the Shell function is not inherited from the environment, and privileges are automatically opened for the setuid script
Verbose	-V	Open verbose mode for debugging
Vi		command line editing using the VI built-in editor
Xtrace	-X	Turn on Echo mode for debugging

The shopt command is an alternative to the set command, many of which are the same as the set command, but it adds a lot of options. You can use the "-P" option to view the settings for the shopt option. The "-u" switch indicates a reset option, and "-S" indicates that the option is currently set.

[Email protected] ~]# shopt-p #查看当前设置情况 Shopt-u Cdable_vars Shopt-u Cdspell Shopt-u Checkhash Shopt-s checkwinsize Shopt-s cmdhist Shopt-u Dotglob Shopt-u Execfail Shopt-s expand_aliases Shopt-u Extdebug Shopt-u Extglob Shopt-s Extquote Shopt-u Failglob Shopt-s Force_fignore Shopt-u gnu_errfmt Shopt-u Histreedit Shopt-u Histappend Shopt-u histverify Shopt-s Hostcomplete Shopt-u Huponexit Shopt-s interactive_comments Shopt-u lithist Shopt-s Login_shell Shopt-u Mailwarn Shopt-u no_empty_cmd_completion Shopt-u Nocaseglob Shopt-u Nullglob Shopt-s Progcomp Shopt-s Promptvars Shopt-u Restricted_shell Shopt-u Shift_verbose Shopt-s SourcePath Shopt-u Xpg_echo [Email protected] ~]#shopt-s Cdspell#把cdspell选项打开 [Email protected] ~]#shopt-p Cdspell#打印cdspell设置 Shopt-s Cdspell [Email protected] ~]#Cd/raot#故意拼写错误 /root [Email protected] ~]#pwd#查看当前目录 /root [[Email protected] ~]# CD/usr/loca/bin#故意拼写错误 /usr/local/bin [Email protected] bin]#pwd#查看当前目录 /usr/local/bin [Email protected] bin]#shopt-u Cdspell#把cdspell选项打开 [Email protected] bin]#shopt-p Cdspell#打印cdspell设置 Shopt-u Cdspell [Email protected] bin]#Cd/raot#故意拼写错误 -BASH:CD:/raot: There is no file or directory #进入目录错误

shopt command Options

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Bash shell-set bash options with built-in set and SHOPT commands