You would like to check the storage engine in a MySQL database.
Use the following query after logging in to the server:
WHERE TABLE_SCHEMA = 'your_db_name';
Taken from here
You want to remove a certain line from your server’s bash history, if for example you pasted a password in the wrong place.
Use the two steps:
1. history -d line_number to remove from memory
2. history -w to write in-memory history to the history file ~/.bash_history
as described here
When the shell is not bash (sh) you can remove them from ~/.ash_history and then source the file.
You would like to change the default editor for crontab from nano to vim.
Add the following to the ~/.selected_editor:
or run the select-editor and choose vim-basic (4)
Select an editor. To change later, run 'select-editor'.
2. /bin/nano <---- easiest
Choose 1-5 : 4