After copying the file such as IOS through TFTP server, how can I install files

[Eden Park]

After copying the file such as IOS through TFTP server, how can I install files. 

Most pages I found here explains how to copy files via TFTP server, but it seems there is not much explanation as to how to install after copy the files. 

No only just for ISO files but to other software after copy files using TFTP server, how can I install them?

Thank you in advance for all guys answering here. !

[Meheretab Mengistu]

Hi Eden,

The commands are different for different platforms. What kind of switch or router are you working on?
Here is a sample which I run for 4948E :

show bootvar ! to check what iOS is current loading
config t
no boot system bootflash:cat4500e-entservices- mz.150-2.SG8.bin
boot system bootflash:cat4500e-entservicesk9- mz.122-54.SG1.bin
exit
!
del bootflash:cat4500e-entservices- mz.150-2.SG8.bin
!
write mem
reload

I was removing cat4500e-entservices- mz.150-2.SG8.bin and loading cat4500e-entservices- mz.150-2.SG8.bin.
N.B.:- Make sure you backup your configuration before making any change.

HTH,
Meheretab