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To list the last time a user logged in, follow these instructions:
Use "last" to find out who has recently used the system, which terminals they used, and when they logged in and out. So, to output a list of recent system use, type:
$ last [RET]
To find out when a particular user last logged in to the system, give his username as an argument. So, to find out when user 'raja' last logged in, type:
$ last raja [RET]