How to replace a string in vi editor which includes / or to replace ^M in vi

To replace a string in vi editor use global replace command,

:%s/searchstring/replacestring/g

this statement will replace searchstring and replace it with replacestring.

One more example,

:%s/hello/hi/g

Here this command will replace string hello with hi in the entire text.

Above is fairly simple and most of us who work on vi are well versed with the command above. Problem is when you want to remove ^M and replace a directory structure with another one.

Consider replacing a directory /home/applmgr with /usr/var in a text file,

:%s/\/home\/applmgr/\/usr\/var/g

here use \ backslash to nullify / forward slash.

Following command will replace ^M,

:%s/^v^M//g

here ^v is CTRL+V and ^M is CTRL+M which after entering in vi looks like below,

:%s/ ^M//g

Comments

SQL Interview Questions on Subqueries

SUB Queries: 1. List the employees working in research department 2. List employees who are located in New York and Chicago 3. Display the department name in which ANALYSTS are working 4. Display employees who are reporting to JONES 5. Display all the employees who are reporting to Jones Manager 6. Display all the managers in SALES and ACCOUNTING department 7. Display all the employee names in Research and Sales Department who are having at least 1 person reporting to them 8. Display all employees who do not have any reportees 9. List employees who are having at least 2 reporting 10. List the department names which are having more than 5 employees 11. List department name having at-least 3 salesman 12. List employees from research and accounting having at-least 2 reporting 13. Display second max salary 14. Display 4th max salary 15. Display 5th max salary -- Answer for nth Max Salary Co-Related Subqueries: 16. Write a query to get 4th max salary from EMP table 17. Wri

Basics of RDBMS

Data Small set of information becomes data, this set of information helps make decision. Data is always some useful information. Database Place where you store the data. Database represents some aspect of the real world called "miniworld". A database is designed, built and populated with data for a specific purpose. It has intended group of users and some preconceived applications in which these users are interested. In other words, a database has some source from which data is derived, some degree of interaction with events in the real world and an audience that is actively interested in the contents of the database. Database can also be defined as collection of one or more tables. Ex: Mobile, human brain etc DBMS (Database Management System ) Is a program that stores retrieves and modifies data in the database on request. Study of different techniques of design, development and maintenance of the database Types of DBMS These types are based upon their m

Answers for SQL Functions

1. SQL> SELECT empno, ename FROM emp WHERE Length(ename) = 4; 2. SQL> SELECT empno, ename, job FROM emp where Length(job)=7; 3. SQL> SELECT Length('qspiders') - Length(replace('qspiders','s','')) FROM dual; 4. SQL> SELECT empno, ename, job FROM emp WHERE Instr(job,'MAN') >0; 5. SQL> SELECT empno, ename, job FROM emp WHERE Instr(job, 'MAN') =1; 6. SQL> SELECT empno, ename, job FROM emp WHERE (Length(ename) - Length(Replace(ename, 'L',''))) = 1; 7. SQL> SELECT * FROM dept WHERE Instr(dname,'O') > 0; 8. SQL> SELECT Concat(ename,' working as a ') || Concat(job, ' earns ') || Concat(sal, ' in ') || Conc at('dept ',deptno) AS text from emp; OR SQL> SELECT Concat(Concat(Concat(Concat(Concat(Concat(Concat(ename,' working as a '), job),' earns '), sal),' in '),'dept '), deptno) AS text FROM emp; 9. SQL

Sharing Knowledge by Mithun Ashok

Search This Blog