Usando bash e xmllint (conforme fornecido pelas tags):
xmllint --version # xmllint: using libxml version 20703
# Note: Newer versions of libxml / xmllint have a --xpath option which
# makes it possible to use xpath expressions directly as arguments.
# --xpath also enables precise output in contrast to the --shell & sed approaches below.
#xmllint --help 2>&1 | grep -i 'xpath'
{
# the given XML is in file.xml
host="$(echo "cat /config/global/resources/default_setup/connection/host/text()" | xmllint --nocdata --shell file.xml | sed '1d;$d')"
username="$(echo "cat /config/global/resources/default_setup/connection/username/text()" | xmllint --nocdata --shell file.xml | sed '1d;$d')"
password="$(echo "cat /config/global/resources/default_setup/connection/password/text()" | xmllint --nocdata --shell file.xml | sed '1d;$d')"
dbname="$(echo "cat /config/global/resources/default_setup/connection/dbname/text()" | xmllint --nocdata --shell file.xml | sed '1d;$d')"
printf '%s\n' "host: $host" "username: $username" "password: $password" "dbname: $dbname"
}
# output
# host: localhost
# username: root
# password: pass123
# dbname: testdb
Caso haja apenas uma string XML e o uso de um arquivo temporário seja evitado, os descritores de arquivo são o caminho a seguir com xmllint (que recebe /dev/fd/3 como um argumento de arquivo aqui):
set +H
{
xmlstr='<?xml version="1.0"?>
<config>
<global>
<install>
<date><![CDATA[Tue, 11 Dec 2012 12:31:25 +0000]]></date>
</install>
<crypt>
<key><![CDATA[70e75d7969b900b696785f2f81ecb430]]></key>
</crypt>
<disable_local_modules>false</disable_local_modules>
<resources>
<db>
<table_prefix><![CDATA[]]></table_prefix>
</db>
<default_setup>
<connection>
<host><![CDATA[localhost]]></host>
<username><![CDATA[root]]></username>
<password><![CDATA[pass123]]></password>
<dbname><![CDATA[testdb]]></dbname>
<initStatements><![CDATA[SET NAMES utf8]]></initStatements>
<model><![CDATA[mysql4]]></model>
<type><![CDATA[pdo_mysql]]></type>
<pdoType><![CDATA[]]></pdoType>
<active>1</active>
</connection>
</default_setup>
</resources>
<session_save><![CDATA[files]]></session_save>
</global>
<admin>
<routers>
<adminhtml>
<args>
<frontName><![CDATA[admin]]></frontName>
</args>
</adminhtml>
</routers>
</admin>
</config>
'
# exec issue
#exec 3<&- 3<<<"$xmlstr"
#exec 3<&- 3< <(printf '%s' "$xmlstr")
exec 3<&- 3<<EOF
$(printf '%s' "$xmlstr")
EOF
{ read -r host; read -r username; read -r password; read -r dbname; } < <(
echo "cat /config/global/resources/default_setup/connection/*[self::host or self::username or self::password or self::dbname]/text()" |
xmllint --nocdata --shell /dev/fd/3 |
sed -e '1d;$d' -e '/^ *--* *$/d'
)
printf '%s\n' "host: $host" "username: $username" "password: $password" "dbname: $dbname"
exec 3<&-
}
set -H
# output
# host: localhost
# username: root
# password: pass123
# dbname: testdb