在shell中编写try catch finally
在shell中编写try catch finally
提问于 2013-03-27 18:21:43
有没有像java try catch finally这样的linux bash命令？还是linux shell一直在运行？
try {
`executeCommandWhichCanFail`
mv output
} catch {
mv log
} finally {
rm tmp
}回答 6
Stack Overflow用户
回答已采纳
发布于 2013-03-27 18:29:10
嗯，差不多吧：
{ # your 'try' block
executeCommandWhichCanFail &&
mv output
} || { # your 'catch' block
mv log
}
rm tmp # finally: this will always happenStack Overflow用户
发布于 2013-11-20 09:32:16
根据您的示例，无论脚本如何退出，您似乎都在尝试执行类似于始终删除临时文件的操作。要在Bash中执行此操作，请尝试trap内置命令来捕获EXIT信号。
#!/bin/bash
trap 'rm tmp' EXIT
if executeCommandWhichCanFail; then
mv output
else
mv log
exit 1 #Exit with failure
fi
exit 0 #Exit with successrm tmp语句中的trap始终在脚本退出时执行，因此将始终尝试删除文件"tmp“。
还可以重置已安装的陷阱；调用仅带信号名称的陷阱将重置信号处理程序。
trap EXIT有关更多详细信息，请参阅bash手册页面：man bash
Stack Overflow用户
发布于 2020-03-01 02:31:24
我在我的脚本中成功地使用了以下语法：
# Try, catch, finally
(echo "try this") && (echo "and this") || echo "this is the catch statement!"
# this is the 'finally' statement
echo "finally this"如果其中一条try语句抛出错误或以exit 1，然后解释器转到catch语句，然后转到finally语句。
如果两个try语句都成功(和/或以exit)时，解释器将跳过catch语句，然后运行finally语句。
示例_1：
goodFunction1(){
# this function works great
echo "success1"
}
goodFunction2(){
# this function works great
echo "success2"
exit
}
(goodFunction1) && (goodFunction2) || echo "Oops, that didn't work!"
echo "Now this happens!"输出_1
success1
success2
Now this happens!示例_2
functionThrowsErr(){
# this function returns an error
ech "halp meh"
}
goodFunction2(){
# this function works great
echo "success2"
exit
}
(functionThrowsErr) && (goodFunction2) || echo "Oops, that didn't work!"
echo "Now this happens!"输出_2
main.sh: line 3: ech: command not found
Oops, that didn't work!
Now this happens!示例_3
functionThrowsErr(){
# this function returns an error
echo "halp meh"
exit 1
}
goodFunction2(){
# this function works great
echo "success2"
}
(functionThrowsErr) && (goodFunction2) || echo "Oops, that didn't work!"
echo "Now this happens!"输出_3
halp meh
Oops, that didn't work!
Now this happens!请注意，函数的顺序将影响输出。如果需要分别尝试和捕获这两个语句，请使用两个try catch语句。
(functionThrowsErr) || echo "Oops, functionThrowsErr didn't work!"
(goodFunction2) || echo "Oops, good function is bad"
echo "Now this happens!"输出
halp meh
Oops, functionThrowsErr didn't work!
success2
Now this happens!页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/15656492
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