shopt:tldr:c866b

The command "shopt -u ${option_name}" is used to unset or disable a specific shell option in Bash.

Here's a breakdown of the command:

• "shopt" is a built-in Bash command that manages various shell options.
• "-u" is an option flag that specifies unsetting or disabling the given option.
• "${option_name}" is a placeholder for the name of the option you want to unset.

For example, if you want to unset the "histappend" option, which controls whether the history list is appended or overwritten, you would use the command "shopt -u histappend". This would disable the option, causing the history list to be overwritten instead of appended.