$ echo $HISTFILE $HISTSIZE $HISTFILESIZE
/home/user/.bash_history 1000 1000
List previous number of history commands
$ history 5
1033 sudo yum update
1034 echo $HISTFILE $HISTSIZE $HISTFILESIZE
1035 history
1036 echo $HISTFILE $HISTSIZE $HISTFILESIZE
1037 history 5
Ctrl + r to search a string history