How to go back to previous line of a script in terminal?

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http://askubuntu.com – I am trying to write a script but I'm stuck here. See the code please! aug@august:~/play$ for i in {1..100..4} > do > echo "august" > touch august $i+$2 > mkdir dir Is there any way to go previous line? I mean there was a mistype, I did in touch august $i+$2. Ipressed ENTER key, so I went for new line. How can I get back to previous line? (HowTos)