The echo builtin copies its arguments to the screen. Given the following command line and its output, how can you repeat the command line with- out retyping it (Sobell, page 31)?

$ echo hi there
hi there

After giving the preceding command, how can you edit the command to
replace hi with hello (Sobell, page 31)?

Press the UP ARROW key and then RETURN to repeat the previous command. Alter-
natively, you can give the command !!.

$ echo hi there
hi there
$ ^hi^hello^
hello there

Computer Science & Information Technology

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