Hi All......


could any body explain me what happens with the following commands ......

echo 0 > / proc/xxxx
echo 1 > / proc/yyyy
echo 2 > / proc/zzzz
echo 3 > / proc/aaaa


form the above four lines i understood that

"echo" is for " Display Purpose/OP"
0,1,2,3.... is this are IRQ Numbers ?
what is the function of " > "?

I think it is silly one for U ... not for me.... any help would be appreciate....

thnx in Advance...

zameer ahmed syed

echoing can be used for a lot of things, but basically what the above is doing:

echo 1 > /proc/whatever
Is sending the 1 to that file, to replace anything in it. Usually 1's turn things on, 0 turns them off.

The > is the thing to note.
If you were to:
echo 1 /proc/whatever
You'd get a 1 on your screen followed probably by a command not found or something similar, and the 1 would not be sent to /proc/whatever. The > tells echo not to send it to stdout (the terminal in this case) but rather to a file.

HTH

Cool

Thanx MasterC for Ur kind and Descriptive Reply..
Well and Understandable Explanation... but one thing i am not understand about numbers ....
If I used 1 , 0 , 2 ,l... i got the same result..... i am not able to differentiate between these numbers..... U said that 1 is for turned ON...
0 is for turned OFF...
I used 0,1and even 2 also ..... didn't get any errors...same result for all..... little bit hanging here that what is turn ON and turn OFF... and about these numbers..
i am requesting U some more explantion about this issue.....

thnx ...
zameer ahmed syed

The numbers are dependant upon whatever process you are applying them to. My suggestion of 1's being 'on' and 0's being 'off' might not always hold true, you'd be best off researching the process you are wanting to apply the numbers to. The number could also be for how many processes to start, or how many subdirectories to recurse...

Cool

thanx MasterC...... U done a gr8 help for me....

No problem, glad I could help.

Cool