bash history command

history -a（增加）

history -w（覆盖）

history -r （读取）

history -c（清除）

.bashrc的设定：

export HISTSIZE=1000000
export HISTFILESIZE=1000000
alias h="history"

HISTSIZE is the number of lines or commands that are stored in memory in a history list while your bash session is ongoing.

HISTFILESIZE is the number of lines or commands that (a) are allowed in the history file at startup time of a session, and (b) are stored in the history file at the end of your bash session for use in future sessions.

就是说HISTSIZE是bash seesion显示的最大条数，HISTFIESIZE是文件保存的最大条数。