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Place for playing with commands…
ODOC: Ctrl+r can be used from command line this will help us to repeat any command that has been used in past very easily. After pressing this in your terminal, it will change your command prompt slightly.
Then start typing the letters of any word in the command that was issued previously. The command will be displayed at the command prompt.
Ex: bala@bala-desktop:~$ ctrl + r (reverse-i-search)`': (reverse-i-search)`fr': import frame 1.jpg
Here i am searching for some command having character ‘fr’ i got it as import frame 1.ipg