In Cpanel Server, resellers and privileges are stored in file
/var/cpanel/resellers
Content of the file look like
root@s20 [~]# cat /var/cpanel/resellers RESELLER-USER-NAME-1:add-pkg,create-acct,create-dns,disallow-shell,edit-dns,edit-mx,edit-pkg,kill-acct,kill-dns,list-accts,park-dns,passwd,show-bandwidth,suspend-acct,upgrade-account,viewglobalpackages RESELLER-USER-NAME-2:add-pkg,create-acct,create-dns,disallow-shell,edit-dns,edit-mx,edit-pkg,kill-acct,kill-dns,list-accts,park-dns,passwd,show-bandwidth,software-attracta,suspend-acct,upgrade-account,viewglobalpackages hoston:create-acct,create-dns,disallow-shell,edit-dns,edit-mx,kill-acct,kill-dns,list-accts,mailcheck,news,park-dns,passwd,restart,show-bandwidth,software-ConfigServer-csf,software-attracta,ssl,ssl-buy,ssl-gencrt,stats,status,suspend-acct,upgrade-account root@s20 [~]#
To get list of all reseller user names, use cut command.
root@s20 [~]# cat /var/cpanel/resellers | cut -d":" -f1 RESELLER-USER-NAME-1 RESELLER-USER-NAME-2 hoston root@s20 [~]#
