[root@TestServer conf]# ps -ef |grep ora
oracle 8867 1 0 16:08 ? 00:00:00 ora_pmon_orcl
oracle 8869 1 0 16:08 ? 00:00:00 ora_mman_orcl
oracle 8871 1 0 16:08 ? 00:00:00 ora_dbw0_orcl
oracle 8873 1 0 16:08 ? 00:00:00 ora_lgwr_orcl
oracle 8875 1 0 16:08 ? 00:00:00 ora_ckpt_orcl
oracle 8877 1 0 16:08 ? 00:00:00 ora_smon_orcl
oracle 8879 1 0 16:08 ? 00:00:00 ora_reco_orcl
oracle 8881 1 0 16:08 ? 00:00:00 ora_cjq0_orcl
oracle 8883 1 0 16:08 ? 00:00:00 ora_d000_orcl
oracle 8885 1 0 16:08 ? 00:00:00 ora_s000_orcl
oracle 8891 1 0 16:08 ? 00:00:00 ora_p000_orcl
oracle 8893 1 0 16:08 ? 00:00:00 ora_p001_orcl
oracle 8895 1 0 16:09 ? 00:00:00 ora_qmnc_orcl
oracle 8897 1 2 16:09 ? 00:00:00 ora_c001_orcl
oracle 8899 1 0 16:09 ? 00:00:00 ora_a001_orcl
oracle 8901 1 2 16:09 ? 00:00:00 ora_mmon_orcl
oracle 8903 1 0 16:09 ? 00:00:00 ora_mmnl_orcl
oracle 8905 1 3 16:09 ? 00:00:00 ora_j000_orcl
oracle 8907 1 5 16:09 ? 00:00:01 ora_j001_orcl
oracle 8909 1 0 16:09 ? 00:00:00 ora_j002_orcl
oracle 8911 1 0 16:09 ? 00:00:00 ora_j003_orcl
oracle 8913 1 1 16:09 ? 00:00:00 ora_q000_orcl
oracle 8915 1 0 16:09 ? 00:00:00 ora_q001_orcl
找到ora_smon_orcl进程id,这里为8877

[root@TestServer conf]# ls -l /proc/8877/cwd
lrwxrwxrwx 1 oracle oinstall 0 3 7 16:10 /proc/8877/cwd -> /oracle10/product/10.1.0/db_1/dbs
可以知道ORACLE_HOME的目录就是/oracle10/product/10.1.0/db_1/dbs了