Welcome to the experience of working with Cisco equipment. There is a good system of on line help implemented in Cisco IOS So you can do "show ?" to see a list of things that you can get information about. I would suggest that you might want to start with these commands:
show version - which will show you information about the device including what code it is running, how much memory and flash it has, and a high level view of the hardware resources.
show inventory which gives more information about the hardware resources of the device.
show diag which also gives information about the hardware resources.
show ip interface brief which provides a listing of all interfaces, their IP address (if one is assigned) and the state of the interface.
show interface to see more detailed information about individual interfaces.
The reason I asked what specific devises you are using is because with Cisco it varies from one router to another and from one IOS to another. With JUNOS, you use the same command across all the platforms wheatear it is M-series, T-Series or J-series routers. Overall the equivalant of JUNOS "show chassis hardware detail" on the 7600 is "sh mod" If you want more details on a specific component, you can also use "sh inven". The equivalent of "sh log" in JONOS is "sh log" or "sh log system".
As you may already know, there is no such command as "insert or "rename" in Cisco IOS. neither there is really a rollback command unless you are running 12.4 and even that is not very gracefull.
also here is a link to the 7600 command referance guide
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...