history命令的优化

1.history添加日期

1.编辑文件
vim /etc/bashrc 
2.末尾添加：
HISTTIMEFORMAT="%F %T "
export HISTTIMEFORMAT
3.刷新
source /etc/bashrc

4.运行history 查看
history

2.汇总命令，并且不同的终端可以通过上翻查询到命令

1.编辑文件
vim /etc/bashrc 
2.末尾添加
# Avoid duplicates
export HISTCONTROL=ignoredups:erasedups
# When the shell exits, append to the history file instead of overwriting it
shopt -s histappend

# After each command, append to the history file and reread it
export PROMPT_COMMAND="${PROMPT_COMMAND:+$PROMPT_COMMAND$'\n'}history -a; history -c; history -r"

3.刷新一下
source /etc/bashrc

4.运行history 查看
history

3.调整大小，增加到10000条

1.编辑文件
vim /etc/bashrc 
2.末尾添加
export HISTSIZE=10000
3.刷新一下
source /etc/bashrc

4.运行history 查看
history

4.完整的配置文件

vim /etc/bashrc 
末尾添加 如下

HISTTIMEFORMAT="%F %T "
export HISTTIMEFORMAT
# Avoid duplicates
export HISTCONTROL=ignoredups:erasedups
# When the shell exits, append to the history file instead of overwriting it
shopt -s histappend

# After each command, append to the history file and reread it
export PROMPT_COMMAND="${PROMPT_COMMAND:+$PROMPT_COMMAND$'\n'}history -a; history -c; history -r"
export HISTSIZE=10000