LXer: Keeping Command History across Multiple Sessions
 

Published at LXer:

The bash shell maintains a history of the commands you entered. You can re-execute a command by recalling it from the history, without having to re-type it. Life is simple if we operate on a single shell session at any given time. If you have 2 simultaneous sessions, you may be surprised that the history does not have the commands you expect.

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Nice tips ... I have encountered that problem many times.