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exit
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===
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退出当前的shell
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## 补充说明
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**exit命令** 同于退出shell,并返回给定值。在shell脚本中可以终止当前脚本执行。执行exit可使shell以指定的状态值退出。若不设置状态值参数,则shell以预设值退出。状态值0代表执行成功,其他值代表执行失败。
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### 语法
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```
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exit(参数)
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```
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### 参数
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返回值:指定shell返回值。
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### 实例
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退出当前shell:
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```
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[root@localhost ~]# exit
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logout
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```
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在脚本中,进入脚本所在目录,否则退出:
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```
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cd $(dirname $0) || exit 1
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```
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在脚本中,判断参数数量,不匹配就打印使用方式,退出:
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```
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if [ "$#" -ne "2" ]; then
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echo "usage: $0 <area> <hours>"
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exit 2
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fi
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```
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在脚本中,退出时删除临时文件:
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```
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trap "rm -f tmpfile; echo Bye." EXIT
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```
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检查上一命令的退出码:
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```
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./mycommand.sh
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EXCODE=$?
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if [ "$EXCODE" == "0" ]; then
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echo "O.K"
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fi
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```
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