Shell game: Managing Bash command history
The Bash shell is the default shell environment in most Linux distributions, including all flavours of Red Hat. One default feature of the Bash shell is to record a history of all the commands entered by a user in a log file called .bash_history, found in the user's home directory.
The history in this file can be retrieved from the command line using the more or cat binaries or by using the internal Bash command, history. For many users, it is useful to retrieve the previously executed commands, usually to save the effort of re-typing them.
So why might we want to limit or disable this Bash command history? Well, among the commands that your users type are file names, command names, IP addresses, passwords and a myriad of other data that are potentially valuable to an attacker intent on subverting or compromising your host. Keeping a record of this data means an attacker may only need to compromise an individual .bash_history file rather than a more difficult source of data.
To limit the size and behaviour of the .bash_history file,
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