could this happen.. ??

consider this output...

Code:


$ ./prog
IITK
IITD
IITM
$


and now this....

Code:


$./prog | wc -l
IITK
IITD
IITM
0
$


in the second case... the output was expected to be ..

Code:


$./prog | wc -l
3
$


what is happening here...?? modify this shell sequence so that expected output is printed....

one of the possible reason could be:
in prog file the o/p has been directed to stderr ,as pipe transform stdoutput of cmd to it;s left to standard input of command to it's right w/o touching it's srderr
contents of prog may include:

Code:


echo IITK 1>&2
echo IITD 1>&2
echo IITM 1>&2


stdoutput is redirected to stderr hence ./prog| wc -l is not producing desired result.
To get desired result stderr should be redirected to stdinput whenever ./prog is used ie

Code:


$ ./prog 2>&1 | wc -l
$ 3