In linux, according to this http://web.mit.edu/kerberos/www/krb5-1.9/krb5-1.9.4/doc/krb5-admin.html The default kerberos cache files are stored in /tmp folder, they match with this pattern: /tmp/krb5cc_<uid>, where <uid> is your UNIX user-id, represented in decimal format. Hope it helps.
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