How to kill all processes with one command in Linux

[oracle@stagedbms3 ~]$ ps -ef | grep $ORACLE_SID

oracle 1525 1 0 10:13 ? 00:00:03 ora_j000_GRIDDB3

oracle 1527 1 0 10:13 ? 00:00:01 ora_j001_GRIDDB3

oracle 4198 1 0 10:27 ? 00:00:00 oracleGRIDDB3 (LOCAL=NO)

oracle 7479 1 0 May30 ? 00:00:00 oracleGRIDDB3 (LOCAL=NO)

.

.

.

oracle 21246 1 0 May30 ? 00:00:09 ora_pmon_GRIDDB3

oracle 21248 1 0 May30 ? 00:00:11 ora_psp0_GRIDDB3

oracle 21250 1 0 May30 ? 00:12:29 ora_vktm_GRIDDB3

oracle 21254 1 0 May30 ? 00:00:01 ora_gen0_GRIDDB3

oracle 21256 1 0 May30 ? 00:00:02 ora_diag_GRIDDB3

oracle 21258 1 0 May30 ? 00:00:02 ora_dbrm_GRIDDB3

oracle 21260 1 0 May30 ? 00:01:00 ora_dia0_GRIDDB3

oracle 21262 1 0 May30 ? 00:00:01 ora_mman_GRIDDB3

oracle 21264 1 0 May30 ? 00:00:11 ora_dbw0_GRIDDB3

oracle 21266 1 0 May30 ? 00:00:24 ora_lgwr_GRIDDB3

oracle 21268 1 0 May30 ? 00:00:16 ora_ckpt_GRIDDB3

oracle 21270 1 0 May30 ? 00:00:07 ora_smon_GRIDDB3

oracle 21272 1 0 May30 ? 00:00:00 ora_reco_GRIDDB3

oracle 21274 1 0 May30 ? 00:00:16 ora_mmon_GRIDDB3

.

.

[oracle@stagedbms3 ~]$ ps -ef | grep $ORACLE_SID | grep -v grep | awk '{print $2}'

1525

1527

4198

7479

7481

7761

7776

.

.

12650

12652

16898

21246

21248

.

.

[oracle@stagedbms3 ~]$ kill -9 `ps -ef | grep $ORACLE_SID | grep -v grep | awk '{print $2}'`

[oracle@stagedbms3 ~]$ ps -ef | grep $ORACLE_SID

oracle 11990 11927 0 10:50 pts/1 00:00:00 grep GRIDDB3

NOTE: Please don’t try to kill oracle processes unless you have other alternative than killing process like this.