[oracle@DB-Server admin]$ grep "V\$TEMP_SPACE_HEADER" *.sql [oracle@DB-Server admin]$ grep -i "V\$TEMP_SPACE_HEADER" *.sql catspacd.sql:drop public synonym v$temp_space_header; catspacd.sql:drop public synonym gv$temp_space_header; catspace.sql:create or replace view v_$temp_space_header as select * from v$temp_space_header; catspace.sql:create or replace public synonym v$temp_space_header for v_$temp_space_header; catspace.sql:create or replace view gv_$temp_space_header as select * from gv$temp_space_header; catspace.sql:create or replace public synonym gv$temp_space_header catspace.sql: FROM gv$temp_space_header [oracle@DB-Server admin]$
另外，例如检查安装的MySQL组件
[root@DB-Server init.d]# rpm -qa | grep -i mysql MySQL-devel-5.6.23-1.linux_glibc2.5 MySQL-client-5.6.23-1.linux_glibc2.5 MySQL-server-5.6.23-1.linux_glibc2.5
5：从文件内容查找不匹配指定字符串的行：
$ grep –v "被查找的字符串" 文件名
例如查找某些进程时，我们不想显示包含命令grep ora_mmon的进程，如下所示
[oracle@DB-Server admin]$ ps -ef | grep ora_mmon oracle 16675 16220 0 00:09 pts/1 00:00:00 grep ora_mmon oracle 21412 1 0 Aug22 ? 00:00:07 ora_mmon_gsp [oracle@DB-Server admin]$ ps -ef | grep ora_mmon | grep -v grep oracle 21412 1 0 Aug22 ? 00:00:07 ora_mmon_gsp [oracle@DB-Server admin]$
6：搜索、查找匹配的行数：
$ grep -c "被查找的字符串" 文件名
[oracle@DB-Server admin]$ [oracle@DB-Server admin]$ grep "v\$temp_space_header" *.sql catspacd.sql:drop public synonym v$temp_space_header; catspacd.sql:drop public synonym gv$temp_space_header; catspace.sql:create or replace view v_$temp_space_header as select * from v$temp_space_header; catspace.sql:create or replace public synonym v$temp_space_header for v_$temp_space_header; catspace.sql:create or replace view gv_$temp_space_header as select * from gv$temp_space_header; catspace.sql:create or replace public synonym gv$temp_space_header catspace.sql: FROM gv$temp_space_header [oracle@DB-Server admin]$ grep -c "v\$temp_space_header" catspacd.sql 2 [oracle@DB-Server admin]$ grep -c "v\$temp_space_header" catspace.sql 5 [oracle@DB-Server admin]$
7：有些场景，我们并不知道文件类型、或那些文件包含有我们需要搜索的字符串，那么可以递归搜索某个目录以及子目录下的所有文件
[oracle@DB-Server ~]$ grep -r "v\$temp_space_header" /u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/
/u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/catspace.sql:create or replace view v_$temp_space_header as select * from v$temp_space_header;
/u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/catspace.sql:create or replace public synonym v$temp_space_header for v_$temp_space_header;
/u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/catspace.sql:create or replace view gv_$temp_space_header as select * from gv$temp_space_header;
/u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/catspace.sql:create or replace public synonym gv$temp_space_header
/u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/catspace.sql: FROM gv$temp_space_header
/u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/catspacd.sql:drop public synonym v$temp_space_header;
/u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/catspacd.sql:drop public synonym gv$temp_space_header;
[oracle@DB-Server ~]$
8：如果我们只想获取那些文件包含搜索的内容，那么可以使用下命令
[oracle@DB-Server ~]$ grep -H -r "v\$temp_space_header" /u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/ | cut -d: -f1
/u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/catspace.sql
/u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/catspace.sql
/u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/catspace.sql
/u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/catspace.sql
/u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/catspace.sql
/u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/catspacd.sql
/u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/catspacd.sql
[oracle@DB-Server ~]$ grep -H -r "v\$temp_space_header" /u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/ | cut -d: -f1 | uniq
/u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/catspace.sql
/u01/app/oracle/product/11.1.0/dbhome_1/rdbms/admin/catspacd.sql
[oracle@DB-Server ~]$
9：如果只想获取和整个搜索字符匹配的内容，那么可以使用参数w
你可以对比一下两者的区别