How can I see all of the bash history?

Question

Below is my command on shell(1):

$ ping google.com

PING google.com (74.125.235.164) 56(84) bytes of data.

64 bytes from nrt19s12-in-f4.1e100.net (74.125.235.164): icmp_seq=1 ttl=54 time=2.85 ms

64 bytes from nrt19s12-in-f4.1e100.net (74.125.235.164): icmp_seq=2 ttl=54 time=3.42 ms

Below is my command on shell(2): 

$ history

 .

 .

 .

 8720  exit

 8721  clear

 8722  history

It shows only the executed results of shell(1). I want to see the history executed by shell(1) as well. Can anyone tell me how to see all the bash history? 

Answer 1

You can use histappend shell option and the -a flag to history:

 Histappend: If set, the history list is appended to the file named by the value of the HISTFILE variable when the shell exits, rather than overwriting the file.

 History: -a Append the "new" history lines (history lines entered since the beginning of the current bash session) to the history file.

 If you put history -a into your PROMPT_COMMAND, you'll get an always-up-to-date .bash_history file.

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