history命令显示时间记录
查了半天系统环境变量HISTTIMEFORMAT丝毫不见踪迹 原来在bash man中才有收录
#man bash HISTTIMEFORMAT If this variable is set and not null, its value is used as a format string for strftime(3) to print the time stamp associated with each history entry displayed by the history builtin. If this variable is set, time stamps are wr
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