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Before I was able to use the Up/Down arrow keys to cycle through previous commands, but now when I press a directional key it outputs "^[[A". I'm running a bash shell. How do I fix this?

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Whats your terminal? – echox Oct 23 '10 at 0:48
How would I find that information? – please help Oct 23 '10 at 1:09
@please: I expect that you are using a terminal emulator which is what you might call a "shell window" on whatever system you are running. As this is almost certainly so, your probably have a Help -> About menu selection: what does that say? What operating system are you running your terminal on? (e.g. Windows, MacOS, Debian, etc.) – msw Oct 23 '10 at 3:29
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There are many possibilities: your terminal is misconfigured (unlikely), your shell has wrong ideas about your terminal (less unlikely), you're getting a shell other than bash, etc. To start diagnosing, describe your OS (distribution, version, …), how you start a shell window, and the output of echo $TERM; ps -p $$ -p $PPID in a shell window. – Gilles Oct 23 '10 at 22:16
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What do the commands echo $TERM and toe print? – ephemient Oct 23 '10 at 22:20

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Try typing

set -o emacs
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That would be my advice, too. Seems like vi mode is enabled in the shell. – mru Oct 24 '10 at 18:29

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