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A 2001 study of [[Red Hat Linux]] 7.1 found that this distribution contained 30 million [[source lines of code]].<ref name = "estimating_size"/> Using the [[COCOMO|Constructive Cost Model]], the study estimated that this distribution required about eight thousand man-years of development time. According to the study, if all this software had been developed by conventional [[proprietary software|proprietary]] means, it would have cost about ${{formatprice|{{inflation|US|1080000000|2000}}|0}} ({{CURRENTISOYEAR}} US dollars) to develop in the United States.<ref name = "estimating_size">{{cite web | first = David A | last = Wheeler | date = 2002-07-29 | url = http://www.dwheeler.com/sloc/redhat71-v1/redhat71sloc.html | title = More Than a Gigabuck: Estimating GNU/Linux's Size | accessdate = 2006-05-11 }}</ref>
Most of the code (71%) was written in the [[C (programming language)|C]] [[computer programming|programming]] [[programming language|language]], but many other languages were used, including [[C++]], [[Lisp (programming language)|Lisp]], [[assembly language]], [[Perl]], [[Python (programming language)|Python]], [[Fortran]], and various [[shell script]]ing languages. Slightly over half of all lines of code were licensed under the GPL. The Linux kernel itself was 2.4 million lines of code, or 8% of the total.<ref name = "estimating_size"/>
In a later study, the same analysis was performed for [[Debian|Debian GNU/Linux]] version 4.0 (etch, which was released in 2007).<ref>{{cite web | first = Juan José | last = Amor | coauthors = et al. | date = 17 June 2007 | url = https://penta.debconf.org/~joerg/attachments/33-measuring_etch_slides.pdf | title = Measuring Etch: the size of Debian 4.0 | accessdate = 2007-09-16 }}</ref> This distribution contained close to 283 million source lines of code, and the study estimated that it would have required about seventy three thousand man-years and cost US${{formatprice|{{inflation|US|7170186240|2007}}|0}} (in {{CURRENTISOYEAR}} dollars) to develop by conventional means. <!-- original paper quoted 5358000000 euros, but Wikipedia does not have an inflation calculator for euros; converted to USD via June 17 2007 exchange rate as provided by http://www.bankofcanada.ca/en/rates/exchform.html and double-checked against other sources of historical exchange rates ... it is also more useful to quote the number in dollars, for comparison to other dollar amounts quoted in this article, e.g. the 2001 study above -->
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