On the IOS XR it’s a bit different, but still pretty easy.
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RP/0/RSP0/CPU0:router01#conf t
RP/0/RSP0/CPU0:router01(config)#commit replace
This commit will replace or remove the entire running configuration. This
operation can be service affecting.
Do you wish to proceed? [no]: yes
RP/0/RSP0/CPU0:ios(config)#
