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I sometimes start writing a command in the terminal (iTerm2) which half-way written I want to erase.

How can quickly remove all the characters on the line being worked on in the terminal?

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up vote 4 down vote accepted

Press Ctrl-C. This will essentially start a new line.

To clear everything before the cursor position, use Ctrl-U.

To clear everything after the cursor position, use Ctrl-K.

These are some of the basic Bash keyboard shortcuts.

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Werner strikes again – BloodPhilia Jan 29 '12 at 20:03

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