> is it possible to add/modify users by modifying files?
No. Cyrus keeps files in binary form. Cyradm just an CLI for standard IMAP commands.
You may run IMAP commands to create mailboxes (even through telnet connection). Of course should have admin rights.
That strange that it segfaults, and I suggest you to get a good cyradm (from your distro). It is even not a binary, it's a shell script.
If it breaks, that means you either don't have perl or your perl libs for IMAP are damaged or something else.
My first suggestion, you are misspelled, the correct syntax is (note double minus):
cyradm --user cyrus localhost
If you do really have troubles, here is 'standard' telnet IMAP session for deleting and creating users (allow plaintext login first in /etc/imap.conf and add 'root' in admin userlist).
telnet localhost 143. Basically after authentication with 'anystring user password' in telnet session, you should enter 2 commands:
'CREATE user.mailboxname'
and
'SETACL user.mailboxname mailboxname lrswipkxtea'
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OK [CAPABILITY IMAP4 IMAP4rev1 LITERAL+ ID STARTTLS] smoothping.com Cyrus IMAP4 v2.3.7-Invoca-RPM-2.3.7-2.el5_3.2 server ready
1 CAPABILITY
* CAPABILITY IMAP4 IMAP4rev1 LITERAL+ ID STARTTLS ACL RIGHTS=kxte QUOTA MAILBOX-REFERRALS NAMESPACE UIDPLUS NO_ATOMIC_RENAME UNSELECT CHILDREN MULTIAPPEND BINARY SORT SORT=MODSEQ THREAD=ORDEREDSUBJECT THREAD=REFERENCES ANNOTATEMORE CATENATE CONDSTORE IDLE LISTEXT LIST-SUBSCRIBED X-NETSCAPE URLAUTH
1 OK Completed
2 CAPABILITY
* CAPABILITY IMAP4 IMAP4rev1 LITERAL+ ID STARTTLS ACL RIGHTS=kxte QUOTA MAILBOX-REFERRALS NAMESPACE UIDPLUS NO_ATOMIC_RENAME UNSELECT CHILDREN MULTIAPPEND BINARY SORT SORT=MODSEQ THREAD=ORDEREDSUBJECT THREAD=REFERENCES ANNOTATEMORE CATENATE CONDSTORE IDLE LISTEXT LIST-SUBSCRIBED X-NETSCAPE URLAUTH
2 OK Completed
3 LOGIN root your_root_password
3 OK [CAPABILITY IMAP4 IMAP4rev1 LITERAL+ ID LOGINDISABLED ACL RIGHTS=kxte QUOTA MAILBOX-REFERRALS NAMESPACE UIDPLUS NO_ATOMIC_RENAME UNSELECT CHILDREN MULTIAPPEND BINARY SORT SORT=MODSEQ THREAD=ORDEREDSUBJECT THREAD=REFERENCES ANNOTATEMORE CATENATE CONDSTORE IDLE LISTEXT LIST-SUBSCRIBED X-NETSCAPE URLAUTH] User logged in
4 RLIST "" ""
* LIST (\Noselect) "." ""
4 OK Completed (0.000 secs 0 calls)
5 DELETE user.test
5 NO Mailbox does not exist
6 DELETE user.testme
6 OK Completed
7 CREATE user.testme
7 OK Completed
8 SETACL user.testme root lrswipkxtea
8 OK Completed
9 SETACL user.testme testme lrswipkxtea
9 OK Completed
10 SETQUOTA user.testme (STORAGE 1000000)
10 OK Completed
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