I want to remove the newline before the </script> in my HTML file with a Linux command (sed, awk…).
Sample input:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JavaScript Ders 2</title>
<script type="text/javascript" src="script1.js" language="javascript">
</script>
<script type="text/javascript" src="script2.js" language="javascript">
</script>
<script>
// script kodumuz buraya yazılacak
</script>
</head>
<body>
<script type="text/javascript" src="script3.js" language="javascript">
</script>
</body>
</html>
Sample output:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JavaScript Ders 2</title>
<script type="text/javascript" src="script1.js" language="javascript"> </script>
<script type="text/javascript" src="script2.js" language="javascript"> </script>
<script>
// script kodumuz buraya yazılacak</script>
</head>
<body>
<script type="text/javascript" src="script3.js" language="javascript"> </script>
</body>
</html>
I tried different syntax, but none of them could do.
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Answer
First of all, as mentioned in the comments Don’t parse XML with Regex! Never do it, never think about it. Make it a habit not to think about it! Sometimes it might look to be a simple task that can be performed with sed or awk or any other regex parser, but no …
What you can do, on the other hand—if you really want to use sed or awk — processes the file first with xmlstarlet and convert it into a PYX format.
The PYX format is a line-oriented representation of XML documents that is derived from the SGML ESIS format. (see ESIS – ISO 8879 Element Structure Information Set spec, ISO/IEC JTC1/SC18/WG8 N931 (ESIS))
So what you realy want to do is something like :
$ xmlstarlet pyx <file.html> | do_your_magic_here | xmlstarlet depyx > file.new.html
In your case this would be something like:
$ xmlstarlet pyx file.html
| awk 'c~/^- *\n *$/&&/^)script$/{c=$0;next}{print c; c=$0}END{print c}'
| xmlstarlet depyx
This will output
<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type"></meta>
<title>JavaScript Ders 2</title>
<script language="javascript" src="script1.js" type="text/javascript"></script>
<script language="javascript" src="script2.js" type="text/javascript"></script>
<script>
// script kodumuz buraya yazılacak
</script>
</head>
<body>
<script language="javascript" src="script3.js" type="text/javascript"></script>
</body>
</html>