http://www.ibm.com/developerworks/cn/linux/shell/awk/awk-1/
http://www.ibm.com/developerworks/cn/linux/shell/awk/awk-2/
http://www.ibm.com/developerworks/cn/linux/shell/awk/awk-3/
http://www.ibm.com/developerworks/cn/education/aix/au-gawk/index.html
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