HISTFILESIZE2000

HISTFILESIZE2000 is an environment variable used in some Unix-like operating systems, most notably those employing the Bash shell. It controls the maximum number of lines that can be stored in the history file. The history file is a record of commands previously executed by the user in the shell. By setting HISTFILESIZE2000 to a specific value, users can limit the size of this file, which can be beneficial for managing disk space or for privacy reasons. When the history file reaches the limit defined by HISTFILESIZE2000, older commands are typically discarded to make room for newer ones. This variable works in conjunction with HISTSIZE, which controls the number of commands kept in memory during a shell session. If HISTFILESIZE2000 is not set, the system may use a default value or a value determined by other configuration settings. Setting HISTFILESIZE2000 to a very large number, or to zero, can have different effects depending on the shell's implementation. For instance, setting it to zero might effectively disable command history saving. Users typically set this variable in their shell configuration files, such as `.bashrc` or `.bash_profile`, so that it is applied automatically every time a new shell session is started.