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Linux top 50 cmd - Fc

The fc command is used to edit the history file. The parameters passed to it, if there are any, can be used to select a range of commands from the history file. This list is then placed in an editing shell. The editor that it uses is based upon the value of the variable FCEDIT. If there is no value for this variable, the command looks at the EDITOR variable. If it is not there, the default is used, which is vi.