fche changed the topic of #systemtap to: http://sourceware.org/systemtap; email systemtap@sourceware.org if answers here not timely, conversations may be logged
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<fche>
ericlee, hi
<fche>
as a preprocessor conditional
<fche>
see e.g. the argv.stp tapset
<fche>
global argv_1 = %( $# >= 1 %? @1 %: "" %)
<fche>
^^^ in this case, it uses the stringified @1 instead of $1 but it's apprx. the same thing