Ubuntu – History | grep “keyword2find” does not gives unlimited history

bashcommand line

The command

history | grep "keyword2find"

does not gives unlimited history that i typed in the terminal onwards i installed ubuntu. I want to see all of them without a time span.

Best Answer

By default history command, which uses ~/.bash_history file to store command, store only last 2000 commands. So, It doesn't give you unlimited result.

To increase the size, open .bashrc file with this command gedit ~/.bashrc and change the line to increase value

HISTSIZE=1000
HISTFILESIZE=2000

HISTSIZE refers to the number of commands stored.
HISTFILESIZE refers to the number of line contained in the history file.

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Run:

sudo chown bob:bob ~/.bash_history && chmod 660 ~/.bash_history

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You probably are interested about bash quick substitution in the last command:

!!:gs/old/new

Example:

$ ls *.txt | grep -e 'foo' >> list_of_text_files_containing_foo.txt
$ !!:gs/foo/bar
ls *.txt | grep -e 'bar' >> list_of_text_files_containing_bar.txt

For more info about bash substitution, read man bash starting from somewhere from the line 3630.

Best Answer

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