Parsing xml to and replacing specific tags shell script

Question

For the below xml ,I need to replace for CLASSA to failed

Answer 1

In case if xmlstarlet (a command line toolkit to query/edit/check/transform XML documents) is accessible:

xmlstarlet ed -u "//studentAction/studentStatus[preceding-sibling::studentType[1][text() = 'Juniour'] \
           and ancestor::student/studentName[text() = 'CLASSA']]" -v failed students.xml

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The above will output the initial XML document with needed replacement

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The command details:

ed -u - edit/update mode

//studentAction/studentStatus - xpath expression to select studentStatus element which has:

• preceding-sibling::studentType[1][text() = 'Juniour'] - preceding sibling element studentType with value Juniour
• ancestor::student/studentName[text() = 'CLASSA'] - nearest element studentName with value CLASSA