linux - Aliased over existing command -

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i trying remember how alias commands when accidentally thought idea:

alias exit='e'

i had overwritten exit command! while searching answer saw here: http://www.linfo.org/alias.html "unalias removes not aliases created during current session permanent aliases listed in system configuration files." don't know entails didn't want somehow lose exit command forever.

i couldn't find definitively answered question, when exited out of terminal , reopened it, typed exit , worked , still working. explain did , if exiting out of terminal(by clicking x) true solution problem?


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