How to pipe a here-document through a command and capture the result into a variable?

Question

Right now this outputs the value I need on stdout. How can I capture it into a variable so I can use it in the rest of the script?

Requirements:

• The script needs to be all in one file.
• I'd prefer not to write any temp files, if possible.

.

#!/bin/bash

cat << EOF | xsltproc - ../pom.xml | tail -1
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/"><xsl:value-of select="/project/version"/></xsl:template>
</xsl:stylesheet>
EOF

Answer 1

The cat ... | isn't necessary.

foo=$(sed 's/-/_/g' << EOF
1-2
3-4
EOF
)