I issued many commands yesterday in my CentOS 7. But when I wanted to retrieve these commands today, I found there was no any record. When I opened the file .bash_history, I still could not find the commands I issued yesterday but I found many old commands a few days ago. Why were the recent commands not stored? How can I increase the history capability?
Bash – sometimes history commands are not stored in .bash_history
bashcommand history
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Best Answer
The most likely cause for history items not to show up is not by setting
HISTFILEto nothing orHISTSIZEto zero, it is by logging into the same machine twice and exiting with the second bash instance (in which you did little or nothing) after the one where you did a lot. By default Bash doesn't merge histories and the second Bash-exit overwrites the.bash_historythat was so nicely update by the first Bash-exit.To prevent this from happening you can append to the history file instead of overwriting, you can use the
histappendshell option:More details in this answer including how to use
HISTSIZE,HISTFILESIZEandHISTCONTROLto control size, duplicates etc.