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Why do I get different results for the "history" command for the same user after I reconnect a disconnected SSH session?

  • I connect to a server using putty (SSH), say as root
  • My network gets disconnected
  • I reconnect my putty session
  • When I hit my up arrow key to re-run the last used command, it shows a different command

I am guessing this is due to getting reconnected to a different pts. Am I right?

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Possible duplicate: Preserve bash history in multiple terminal windows –  slm May 10 '13 at 8:34
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1 Answer

There are several environment variables that control history's behavior. Some of them include:


Typically what happens is that you have more than one shell open and which ever shell get's closed last clobbers some of the entries that were written there previously by the shell that you closed first.

Take a look at the Bash Reference Manual's section on the history command for more info.

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