Code:
bash-3.00$ rman checksyntax @s
Recovery Manager: Release 10.2.0.4.0 - Production on Fri Dec 20 14:34:22 2013
Copyright (c) 1982, 2007, Oracle. All rights reserved.
RMAN> run {
2> allocate channel d1 type disk FORMAT '/u01/app/oracle/backup/Daily_%U_%t';
3> allocate channel d2 type disk FORMAT '/u01/app/oracle/backup/Daily_%U_%t';
4> allocate channel d3 type disk FORMAT '/u01/app/oracle/backup/Daily_%U_%t';
5>
6> backup incremental level 1 tag 'Daily_Diff_Backup'
7> format '/u01/app/oracle/backup/Daily_%T_L1_%db_df_%U_%t';
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00558: error encountered while parsing input commands
RMAN-01009: syntax error: found ";": expecting one of: "archivelog, as, backup, backupset, blocks, channel, check, comma, copy, copies, controlfilecopy, cumulative, current, database, datafile, datafilecopy, device, diskratio, db_recovery_file_dest, db_file_name_convert, duration, filesperset, for, format, full, force, incremental, keep, (, maxsetsize, nochecksum, noexclude, nokeep, not, proxy, pool, reuse, recovery, skip, spfile, setsize, tablespace, tag, to, validate"
RMAN-01007: at line 7 column 57 file: s