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1.shopt介绍
linux内建命令shopt允许shell在空闲时修改shell选项，它经常出现在启动文件中。但是，在一般脚本中也常出现，不过需要在版本2之后的bash中才支持。
2.样例
-->shopt用法
命令：
help shopt
[root@elasticsearch ~]# help shopt
shopt: shopt [-pqsu] [-o] [optname ...]Set and unset shell options.Change the setting of each shell option OPTNAME. Without any optionarguments, list all shell options with an indication of whether or not eachis set.Options:-o restrict OPTNAMEs to those defined for use with `set -o'-p print each shell option with an indication of its status-q suppress output-s enable (set) each OPTNAME-u disable (unset) each OPTNAMEExit Status:Returns success if OPTNAME is enabled; fails if an invalid option isgiven or OPTNAME is disabled.
[root@elasticsearch ~]#
样例：
[root@elasticsearch ~]# shopt -s cdspell #设置使用cd命令时，允许产生少量的拼写错误
[root@elasticsearch ~]# cd /hpme #应该是"/home"
/home
[root@elasticsearch home]# pwd
/home #正常进入/home目录，说明拼写错误被纠正了
[root@elasticsearch home]#
-->被允许修改的shell选项
[root@elasticsearch home]# shopt
autocd off
cdable_vars off
cdspell on #常用
checkhash off
checkjobs off
checkwinsize on
cmdhist on
compat31 off
compat32 off
compat40 off
compat41 off
direxpand off
dirspell off
dotglob off #常用
execfail off
expand_aliases on
extdebug off
extglob off #常用
extquote on
failglob off
force_fignore on
globstar off
gnu_errfmt off
histappend on
histreedit off
histverify off
hostcomplete on
huponexit off
interactive_comments on
lastpipe off
lithist off
login_shell on
mailwarn off
no_empty_cmd_completion off
nocaseglob off
nocasematch off
nullglob off #常用
progcomp on
promptvars on
restricted_shell off
shift_verbose off
sourcepath on
syslog_history off
xpg_echo off
[root@elasticsearch home]#
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