exec command help

vicky007aggrwal · 10-27-2012, 01:40 PM

Can somebody please help me in understanding the "exec" command.

How we can use it with file descriptors 0,1,2

an example will be a great help

TB0ne · 10-27-2012, 02:06 PM

Quote:

Originally Posted by vicky007aggrwal

Can somebody please help me in understanding the "exec" command. How we can use it with file descriptors 0,1,2
an example will be a great help

Type in "man exec", and you'll see examples and explanations. Google has much also. Without knowing what you've already looked at or what you're confused about, it's hard to help.

http://www.linuxtopia.org/online_boo...de/x13082.html

vicky007aggrwal · 10-27-2012, 02:25 PM

Thanks TBone for responding,,
Just want to ask that is it necessary to assign
File descriptor before redirecting the standard input or output

Eg ; exec 6> &1
exec >output.log

As per above example even without assiging
File descriptor we can use the second command
Directly. I want to know why is it needed to use
FileDescriptor in exec

TB0ne · 10-27-2012, 03:32 PM

Quote:

Originally Posted by vicky007aggrwal

Thanks TBone for responding,,
Just want to ask that is it necessary to assign File descriptor before redirecting the standard input or output

Eg ; exec 6> &1
exec >output.log

As per above example even without assiging File descriptor we can use the second command Directly. I want to know why is it needed to use FileDescriptor in exec

Which is a different question than what you posted initially. Again, putting "why do you need to use file descriptor in exec linux" into Google pulls up lots...and that's a good start for any question. In this instance, you find this:
http://www.refining-linux.org/archiv...e-descriptors/

...a tutorial, with examples.

vicky007aggrwal · 10-28-2012, 07:49 AM

Thanks TBone