"set -x " bash
set -x
echo `expr 10 + 20 `
+ expr 10 + 20
+ echo 30
30"set -x " bash
set -x
echo `expr 10 + 20 `
+ expr 10 + 20
+ echo 30
30"set -x " bash
set +x
echo `expr 10 + 20 `
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