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Bash history commands are those that begin with the character !
(eg. the most popular 'sudo !!' Explained here => http://www.commandlinefu.com/commands/view/13).
By default bash immediately executes the history command.
Setting this shell option will make bash first allow you to verify/edit an
history command before executing it.
To set this option permanently, put this command in ~/.profile or ~/.bashrc file.
To unset this option issue following command.
shopt -u histverify
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