indent-rigidly

Move all lines in the region left or right by a fixed amount.

Ctrl-X Ctrl-I

This command finds the indentation of each line in the region, and augments it by the value of the numeric argument. With a negative numeric argument, -n, the command removes n columns from each line's indentation.

With no numeric argument it uses the variable soft-tab-size if it's nonzero. Otherwise it uses tab-size.

You can also invoke this command by highlighting the region and pressing <Tab> or Shift-<Tab> to add or subtract indentation.

More info:

Indenting Commands

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indent-region Command Reference indent-to-tab-stop