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Terminal history: repeating of the same commands in terminal

Asked by Vlad Myachikov

Hello.
If I type "hello", press enter, then again type "hello" and press enter, "hello" adds to the history again. When I click Up key after it twice in older systems, "hello" is shown me only 1 time and on the second click Terminal shows me other command. Now (11.10) it shows "hello" again, which isn't good. What's wrong?
Thanks.

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Ubuntu bash Edit question
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Solved by:
Nathan Heafner
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Best Nathan Heafner (nathan1465-5) said : 		#1

this should help
http://lindesk.com/2009/04/customize-terminal-configuration-setting-bash-cli-power-user/
http://www.ducea.com/2006/05/15/linux-tips-take-control-of-your-bash_history/

HISTCONTROL=ignoreboth
export HISTCONTROL=ignoredups

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Sam_ (and-sam) said : 		#2

There is ~/.bashrc where lines 8-10 say:
# don't put duplicate lines in the history. See bash(1) for more options
# ... or force ignoredups and ignorespace
HISTCONTROL=ignoredups:ignorespace

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Vlad Myachikov (dddei) said : 		#3

Thanks Nathan Heafner, that solved my question.