Know your shells

[Guest Challenger.]

Here is a command that will let you know about the available shells on your Linux distribution:

#chsh -l

To change your login shell, use the following command:

# chsh
--Chandralekha Balachandran,
reachlekha@gmail.com
Advanced ls commands
The following commands are very useful to know your system better.
lspci – Lists all PCI devices. Use -v for verbose output.
lsusb – Lists all USB devices. Use -v for verbose output.
lsmod – Lists the status of modules in the Linux kernel.
lsattr – Lists file attributes on a second extended Linux file system.
lsof – Lists the file descriptors opened by all the processes. A very useful command when a process fails to close any file descriptors.
To know more details, you can view the manual pages of each command mentioned above.