linux内建命令/内部命令之shopt

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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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