CASE Frequently Asked Questions

theis{serre} 21: set a=1 

theis{serre} 22: while ($a<10) 

? echo $a.hpp > $a.hpp 

? @ a += 1 

? end 

theis{serre} 23: ls 

1.hpp 2.hpp 3.hpp 4.hpp 5.hpp 6.hpp 7.hpp 8.hpp 9.hpp 

theis{serre} 24: more 1.hpp 

1.hpp

Back to: A. File management and editing

How to rename each x.hpp file to x.h:

theis{serre} 25: foreach x (*.hpp) 

? mv $x $x:r.h 

?end 

theis{serre} 26: ls 

1.h 2.h 3.h 4.h 5.h 6.h 7.h 8.h 9.h

Back to: A. File management and editing

How to copy each x.h file to x.H and replace each instance of a "hpp" string with a "h" string:

theis{serre} 27: foreach x (*.h) 

? cat $x | sed -e 's/hpp/H/g' > $x:r.H 

? end 

theis{serre} 28: ls 

1.H 2.H 3.H 4.H 5.H 6.H 7.H 8.H 9.H 

1.h 2.h 3.h 4.h 5.h 6.h 7.h 8.h 9.h 

theis{serre} 29: more 1.H 

1.H

Back to: A. File management and editing

How to grab each instances of the string "hpp" in all the *.h files?

theis{serre} 30: grep hpp *.h 

1.h:1.hpp 

2.h:2.hpp 

3.h:3.hpp 

4.h:4.hpp 

5.h:5.hpp 

6.h:6.hpp 

7.h:7.hpp 

8.h:8.hpp 

9.h:9.hpp

Back to: A. File management and editing

How to find all the *.o files in all your directories ?

theis{serre} 31: find ~/. -name '*.o' 

/users/serre/./crap/marc.o

How to delete all *.o files from all your directories?

theis{serre} 32: rm `find ~ -name '*.o'`
Back to: A. File management and editing

C. Make files

What's a simple make file from Marc

makefile example from Marc

What's a simple make file (Example 1, simple, fairly reliable):

makefile example 1

What's a simple make file (Example 2):

makefile example 2 (from COMP121: Introduction to Data Structure)

What's another make file (Example 3):

makefile example 3 (from COMP121: Introduction to Data Structure)

What's another make file (Example 4, might not work):

makefile example 4 (from COMP121: Introduction to Data Structure)

Back to: B. Make files

D. Evaluating program performance

How to evaluate the performance of the program myprogram using hpm on Cray taking input from the data file mydata.dat and redirecting the output to a file outfile.out:

% hpm myprogram < mydata.dat > & outfile.out

How to clock different part of a program:

Use the clock() function in time.h. Here is a C++ example:

#include <time.h>

#include <iostream.h>

main() 

{

  int i,ni;

  clock_t t1,t2,t3;

  double tdiff1,tdiff2;

  ni=3456;

  cout << "calculating loop one: "<<endl;

  t1 = clock();

  for (i=0; i<ni; i++) {                         

    cout << (int)(100*i/(ni)) << "\%\r" << flush;

    //your calculation

  }

  t2 = clock();

  tdiff1 = double ( t2 - t1 ) / CLOCKS_PER_SEC ;

  cout << tdiff1 << " sec      " << endl;



  ni=4567;

  cout << "calculating loop two: " << endl;

  for (i=0; i<ni; i++) {                         

    cout << (int)(100*i/(ni)) << "\%\r" << flush;

    //your calculation

  }

  t3 = clock();

  tdiff2 = double( t3 - t2 ) / CLOCKS_PER_SEC ;

  cout << tdiff2 << " sec      " << endl;

}

To compile the above program, assuming that the above text is in a file called clockExample.C, just type:
theis{serre} 59: CC -o clockEx clockExample.C
The output of the above example would look like that:
theis{serre} 60: clockEx 

calculating loop one: 0.17 sec 

calculating loop two: 0.27 sec
For more advance techniques, check this web page by Phil Calvin about the Chronograph class, which does timing routine.

Back to: C. Evaluating program performance

E. Automated tar-ing and zip-ing of files.

How do I tar the directory dir_name and all its contents into the tar file dir_name.tar? Answer:

theis{serre} 10: ls -F

dir_name/

theis{serre} 11: tar -cvf dir_name.tar dir_name

theis{serre} 12: ls -F

dir_name/     dir_name.tar