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reverse-i-search of history not finding expected commands

rated 0 times [ 7] [ 0] / answers: 1 / hits: 1106 / 3 Years ago, sat, july 31, 2021, 5:42:14

Today upon bringing up a bash terminal I tried finding a frequently-used command from my bash history via Ctrl-r. To my surprise, it wasn't found. Upon inspecting ~/.bash_history, I saw instances of the command on several lines. Does the command history not work by checking the file, either in real time or against a cached copy?

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answered 3 Years ago otputler · Accepted Answer

It turns out there was a little more nuance than I was aware of: HISTFILESIZE determines the maximum number of lines saved in .bash_history, while HISTSIZE determines the number of lines from ~/.bash_history loaded into a searchable cache. Upon increasing HISTSIZE to match HISTFILESIZE, I was able to find the command via Ctrl-r.