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diff [-ru] file1 file2
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expr [expression]
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id [-ruGgn] username
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printf format [argument...]
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test [expression...]
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tr string1 [string2]
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unexpand [-a] [-t N] [file...]
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od/hd
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uuencode
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uudecode
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sed
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patch
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ed
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awk
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bc/dc
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fmt
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install
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find (bare minimum)
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implement -c for all *sum tools
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