[root@localhost ~]# 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
[root@localhost ~]# set -o vi   #把vi选项打开
[root@localhost ~]# 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

[root@localhost ~]# 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

[root@localhost ~]# shopt -s cdspell   #把cdspell选项打开
[root@localhost ~]# shopt -p cdspell    #打印cdspell设置
shopt -s cdspell
[root@localhost ~]# cd /raot            #故意拼写错误
/root
[root@localhost ~]# pwd                 #查看当前目录
/root
[root@localhost ~]# cd /usr/loca/bin   #故意拼写错误
/usr/local/bin
[root@localhost bin]# pwd               #查看当前目录   
/usr/local/bin
[root@localhost bin]# shopt -u cdspell #把cdspell选项打开
[root@localhost bin]# shopt -p cdspell #打印cdspell设置
shopt -u cdspell
[root@localhost bin]# cd /raot         #故意拼写错误
-bash: cd: /raot: 没有那个文件或目录     #进入目录错误