Remove Everything Before In Txt File?

So,

hopefully this is the right section to ask this in!

I'm looking to remove everything before in a txt file so long story short i've made a number wordlist with Crunch im basically wanting to remove all the unless numbers to numbers i want to start with.

so everything before 1232120000 i want to remove from the txt file i've heard you can do it with sed or awk im not familiar with using sed or awk.


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