Consulta de comando Linux

Alberto Chacon <[email protected]>
Newsgroups gmane.org.user-groups.linux.gulcr
Message-ID <[email protected]>
Hola.
 
Existe un comando en unix para ver la actividad de los usuarios, que dice desde cual IP se conecto y el tiempo de conexión, etc.
 
El problema es que no recuerdo cual es ese comando o archivo.
 
Agradecería si me refrescan la memoria.
 
Salu2.
 
 
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