Quien me manda correo ???
con esto sabemos todos aquellos que nos mandan correo :
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terminal — bash
#!/bin/sh : ${user:=`expr "\`lang=c id\`" : 'uid=[0-9]*(\([^)]*\).*'`} for mbox in /var/mail/$user /usr/spool/mail/$user "" do [ -r "$mbox" ] && break done [ -z "$mbox" ] && exec echo "no mailbox" exec grep "^from " "$@" "$mbox"
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sacado de ugu.