bash脚本-检查输出中的特定字符串是否失败 [英] bash script - check for specific string in output is failing

问题描述

我有以下bash脚本:

I have the following bash script:

#!/bin/sh
psql -U postgres -c "CREATE DATABASE test TEMPLATE template0;"

if [ $? -eq 0 ]; then
    echo OK
else
    if [ $? = 'ERROR:  database "test" already exists' ]; then
         echo OK
    else
         echo FAIL
    fi
fi

当前失败，并显示以下错误:

It's currently failing with the following error:

testbox:/tmp# sh test.sh 
ERROR:  database "test" already exists
FAIL

我不确定我哪里出错了.对于此特定错误，我需要它返回确定".任何其他错误都应打印出失败.你能告诉我我哪里出问题了吗?

I'm not sure where I've gone wrong. I need it to return "OK" for this specific error. Any other errors should print out a FAIL. Can you tell me where I've gone wrong?

谢谢.

编辑1

我修改了代码以捕获输出，而不仅仅是rc:

I've modified the code to capture the output, not just rc:

#!/bin/bash

output=$(psql -U postgres -c "CREATE DATABASE test TEMPLATE template0;")
ret=$?

if [[ $ret -eq 0 ]]; then
    echo OK
else
    if [[ $output == 'ERROR:  database "test" already exists' ]]; then
         echo OK
    else
         echo FAIL
    fi
fi

但我收到此错误:

ERROR:  database "test" already exists
sh: ERROR:  database "test" already exists: unknown operand
FAIL

推荐答案

$?仅表示整数退出代码，而不是 psql 命令的输出.您需要获取 psql 命令的输出并检查 if 条件.

$? represents just the integer exit code not the output of your psql command. You need to grab the output of psql command and check in if condition.

您可以使用:

#!/bin/bash

output=$(psql -U postgres -c "CREATE DATABASE test TEMPLATE template0;" 2>&1)
ret=$?

if [[ $ret -eq 0 ]]; then
    echo OK
else
    if [[ $output == *'already exists'* ]]; then
         echo OK
    else
         echo FAIL
    fi
fi

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