Skip to main content

Passing Parameter to a Dos/Windows Batch File

Some time we need to provide the parameters (the data to be processed) to a batch file at the time of calling the batch process. Suppose we want to add two numbers by a batch file. So, let's consider a name for the batch file, say, add.bat
Now, if we want to add 4 and 5 by this batch file we have to write on the command prompt as,
add 4 5
Then it will show the result 9

In a batch file the parameters are referred by numbering like, for the discussed batch file %1 refers the first value of parameter, i.e., 4 and %2 refers 5.
So the content of the batch file will be....

@echo off
set/a sum= %1 + %2
echo %sum%
echo on
Comments on each line............... @echo off :: This command will off the echoing (displaying) the next commands until the echoing is on. set/a sum= %1 + %2 :: This Command evaluate the addition process and store the value in a variable named sum. /a is a switch for set command to evaluate any expression. echo %sum% :: This command will show the value of summation which is stored in the variable sum. echo on :: After this command every command will be echoed on the screen. If you want to pass a filename as a parameter and work on that file then some additional references will be needed. The following Table will help you to know about them.
ParametersComments
%~f1Expands %1 to a fully qualified pathname. If you passed only a file name from the current directory, this parameter would also expand to the drive or directory.
%~d1Extracts the drive letter from %1
%~p1Extracts the path from %1
%~n1Extracts the filename from %1 without the extension
%~x1Extract the file extension from %1
%~s1Changes the n and x options’ meanings to reference the short name. You would therefore use %~sn1 for the short filename and %~sx1 for the short extension.
And we also combine them to get our expected result. As Example.... %~dp1 to expand %1 to a drive letter and path only or use %~sp1 to display short path.
Labels:

Comments

Post a Comment

Popular posts from this blog

Day of Week according to Date

We have 7 days in a week. And the first Day of the Date System is Sunday . And it should be. So, 01.01.0001, i.e., First Date of Christ was Sunday. We just number the days as follows. 0 = Sunday 1 = Monday 2 = Tuesday 3 = Wednessday 4 = Thursday 5 = Friday 6 = Saturday So, we can handle every day by the reminder of 7. Cause, u just see, after every 7 days the same day is repeated. Then, lets a rough Calculation. 01/01/0001 => Sunday = 0 Now, we just try to find out the day on 1st January on next year, i.e., 01/01/0002 0001 has 365 days. So, after 365 days which day will come? To find out the answer of this question we have to perform following calculation. 7 ) 365 ( 52 35 ----- 15 14 ---- 1 The reminder is 1, i.e.,Monday. But, using this method, it is very critical to find out the day of 1st January of 1988. So, we have an another idea. Find out how many Leap years are present before current year. Suppose it is L . So, L = y/4 If Current year is...
Post a Comment
Read more

Class Point:: It holds co-ordinates of a point in format (x,y)

A class Named "Point" which stores the Co-ordinates of a point in (x,y) Format. This Class Contains:: O Constructor with default arguments O Copy Constructor O Function to display which Co-ordinate a Point belongs to O Function to get value of x of a point O Function to get value of y of a point O Function to get the Radious Vector (r) of a point O Function to get the Theta of a point O Overloaded Operator - to find out distance between two points O Overloaded Operator >> to take input O Overloaded operator O Destructor #include<iostream.h> #include<math.h> class point{ //Data Members int x,y; //They hold the value of X and Y co-ordinate of a Point. public: //Member Functions point(int t1=0, int t2=0) //Constructor with default arguments. { x=t1; y=t2; } point(point &t) //Copy Constructor { x=t.x; y=t.y; } int coordinate(void); //It returns the point's Co-ordinate, e.g., 1, 2, 3, or 4th. int getx(...
Post a Comment
Read more