运行 shell 脚本时 sh -x 与 bash -x
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sh -x vs bash -x while running shell script
提问by AKIWEB
Below is my shell script which I am using to create a PIE Graph.
下面是我用来创建 PIE Graph 的 shell 脚本。
#! /bin/bash
TEMP=$(mktemp -t chart.html)
QUERY1=36
QUERY2=64
cat > $TEMP <<EOF
<html>
<head>
<!--Load the AJAX API-->
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
// Load the Visualization API and the piechart package.
google.load('visualization', '1.0', {'packages':['corechart']});
// Set a callback to run when the Google Visualization API is loaded.
google.setOnLoadCallback(drawChart);
// Callback that creates and populates a data table,
// instantiates the pie chart, passes in the data and
// draws it.
function drawChart() {
// Create the data table.
var data = new google.visualization.DataTable();
data.addColumn('string', 'Title');
data.addColumn('number', 'Value');
data.addRows([
['Error Percentage', $QUERY1],
['No Error Percentage', $QUERY2]
]);
// Set chart options
var options = {'title':'Errors',
'width':400,
'height':300};
// Instantiate and draw our chart, passing in some options.
var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>
</head>
<body>
<!--Div that will hold the pie chart-->
<div id="chart_div"></div>
</body>
</html>
EOF
# open browser
case $(uname) in
Darwin)
open -a /Applications/Google\ Chrome.app $TEMP
;;
Linux|SunOS)
firefox $TEMP
;;
esac
Problem Statement:-
问题陈述：-
I saved the above file as chart.sh. And whenever I am trying to run the above chart.shfile as sh -x chart.sh
我将上述文件另存为chart.sh. 每当我尝试运行上述chart.sh文件时sh -x chart.sh
I always get the error as-
我总是收到错误 -
syntax error at line number 3: `TEMP=$' unexpected
But when I try to run the above shfile as-
但是当我尝试将上述sh文件作为-
bash -x chart.sh
then I don't get any error. Why is it so? Is there anything wrong in my shell script and suppose If I need to run it like sh -x chart.shalways then what I need to make changes in my shell script?
那我什么都没有error。为什么会这样？我的 shell 脚本有什么问题，假设如果我需要像sh -x chart.sh往常一样运行它，那么我需要在我的 shell 脚本中进行哪些更改？
I am running SunOS.
我在跑步SunOS。
回答by rid
shand bashcan point to completely different executables. The fact that shis a symbolic link to bashon certain systems should not make you assume the same is true everywhere. If you need bash, use it explicitly.
sh并且bash可以指向完全不同的可执行文件。在某些系统上sh是符号链接的事实bash不应该让您假设在任何地方都是如此。如果需要bash，请明确使用它。
EDIT(mpapis): Also note that even when you call bashvia shit does not behave exactly the same.
编辑（mpapis）：另请注意，即使您bash通过sh它调用，它的行为也不完全相同。
回答by Random832
See this page: http://docs.oracle.com/cd/E19082-01/819-2252/6n4i8rtus/index.htmlfor information on how to set your PATHvariable to call the POSIX-compatible version of shand other tools.
请参阅此页面：http: //docs.oracle.com/cd/E19082-01/819-2252/6n4i8rtus/index.html，了解有关如何设置PATH变量以调用 POSIX 兼容版本sh和其他工具的信息。
