Created
November 1, 2011 16:21
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on removing commands from history
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# say we start with an empty bash command history | |
bash-3.2$ history | |
1 history | |
# enter a command that requires a password | |
bash-3.2$ sudo rm -i some_file | |
Password: | |
# accidentally ^C and type your password | |
# into the prompt and hit enter | |
bash-3.2$ secret_password | |
bash: secret_password: command not found | |
# your password is now there for all to | |
# see in your bash history | |
bash-3.2$ history | |
1 history | |
2 sudo rm -i some_file | |
3 secret_password | |
4 history | |
# first option to fix it, delete the numbered entry from | |
# history and write to your ~/.bash_history file | |
bash-3.2$ history -d 3 | |
bash-3.2$ history -w | |
# entry 3 will be removed entirely from your command history | |
bash-3.2$ history | |
1 history | |
2 sudo rm -i some_file | |
3 history | |
4 history -d 3 | |
5 history -w | |
6 history | |
# the second option is to clear the entire history | |
# and write the changes to disk | |
bash-3.2$ history -c | |
bash-3.2$ history -w | |
# it's now pretty obvious that your history has been | |
# scrubbed clean, but at least your password is history! | |
bash-3.2$ history | |
1 history -w | |
2 history |
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You can combine the
history -c
andhistory -w
statements ashistory -cw
to avoid leaving evidence of the scrubbing.