HISTSIZE or HISTFILESIZE:
Configures the size of your history file. On most distributions, this is set to 1,000 entries. You can customize the size of your history file by changing the value of this variable.
HISTCONTROL:
Controls how your command history is stored. You can set this variable to a value of ignoredups, ignorespace, ignoreboth, or erasedups. A value of ignorespace tells the shell to ignore commands in the history that start with spaces. A value of ignoredups tells the shell to ignore duplicate commands in the history. A value of ignoreboth specifies both ignorespace and ignoredups. You can also set this variable to a value of erasedups to remove all duplicate entries in the history file
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