Did not see it in the docs. Here’s what I’m trying to do:
echo "<foo><bar t='A' /><bar t='B' /></foo>" | xmlstarlet ed -u "//bar/@t" -v "1_[//bar/@t]"
I want to pre-append the prefix 1_ to t.
Expected Output:
<?xml version="1.0"?> <foo> <bar t="1_A"/> <bar t="1_B"/> </foo>
Actual Output:
<?xml version="1.0"?> <foo> <bar t="1_[//bar/@t]"/> <bar t="1_[//bar/@t]"/> </foo>
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Answer
Try this:
echo "<foo><bar t='A' /><bar t='B' /></foo>" | xmlstarlet ed -u "//bar/@t" -x 'concat("1_", .)'
-v
is for fixed values, -x
is for xpath expressions.