Usage History of 'subshell'

The following chart shows how frequently 'subshell' appeared in printed materials over time. For example, the word 'subshell' occurred 2 times in books in 1906 and 4,375 times in 2008. From 1906 to 2008, the word 'subshell' was used a total of 116,059 times in books scanned by Google. See Reference: Google Ngram project.

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