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从输入变量导出值

tag-icon • tag-icon linux bash shell-script variable variable-substitution
从输入变量导出值

我需要从输入中导出值。然而它在 bash 中失败了。

这是代码 -

echo "Please enter HOST :"
read RDSHOST && export RDSHOST

我的价值是这样的 - myserver.abc-zone5.com

当我运行脚本时出现此错误 - 寻找匹配的“”语法错误时出现意外的 EOF：意外的文件结尾

需要了解如何用双引号导出变量以避免此错误

答案1

echo "Please enter REGION to login :" 
read region && export region 
echo "Please enter HOST to login :" 
read HOST && export HOST
echo "Please enter Port to login :" 
read localport && export localport
echo "Please enter username to login : " 
read username && export username sql "host=$HOST port=$localport user=$username --region=$region"

echo "username sql \"host=$HOST port=$localport user=$username --region=$region\""

输出：

Please enter REGION to login :
ASIA
Please enter HOST to login :
localhost
Please enter Port to login :
6000
Please enter username to login : 
foo
username sql "host=localhost port=6000 user=foo --region=ASIA"

答案2

shas的答案很好，我想补充一点，export在将值分配给变量后不必设置变量的属性。这意味着您可以在不干扰脚本主要流程的情况下进行导出：

# prep for user input
export region
export HOST
export localport
export username

# prompt user for input
echo 'Please enter REGION to login :'
read region
echo 'Please enter HOST to login :'
read HOST
echo 'Please enter Port to login :'
read localport
echo 'Please enter username to login :'
read username

# show and invoke the sql command
echo "sql \"host=$HOST port=$localport user=$username --region=$region\""
sql "host=$HOST port=$localport user=$username --region=$region"

此外，export可以使用多个变量的名称来设置属性，从而使该部分代码更短：

# prep for user input
export region HOST localport username

# prompt user for input
echo 'Please enter REGION to login :'
read region
echo 'Please enter HOST to login :'
read HOST
echo 'Please enter Port to login :'
read localport
echo 'Please enter username to login :'
read username

# show and invoke the sql command
echo "sql \"host=$HOST port=$localport user=$username --region=$region\""
sql "host=$HOST port=$localport user=$username --region=$region"

（我还将提示字符串用单引号括起来，因为它们不会扩展任何变量，并在调用它之前回显 sql 命令，因此如果 sql 命令挂起，用户知道脚本正在做什么）

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