Module 11: Search and Sort Tools - E-Courses

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Operating Systems Prof. P. C. P. Bhat Indian Institute of Science Bangalore Operating Systems/Search and Sort Tools Lecture Notes The file check should have 40 lines in it. Clearly, split and merge would be useful to support merge-sort and for assembling a set of smaller files that can be sent over a network using e-mail whenever there are restrictions on the size of attached files. In the next module we shall learn about the AWK tool in Unix. Evolution of AWK is a very good illustration of how more powerful tools can be built. AWK evolves from the (seemingly modest) generic tool grep!! PCP Bhatt/IISc, Bangalore M11/V1/June 04/8
Operating Systems Prof. P. C. P. Bhat Indian Institute of Science Bangalore Operating Systems/Search and Sort Tools Worked out Examples Worked out Examples 11.1 What is wild-cards used for in the file related operations? Wild card is the set of characters used for pattern matching in file related operations. When we use these characters in conjugation with the commands used for file, they save a lot of work. For example if we want to list the files which start with chap and ends with three more characters. like chapter chap001 chap002 chap003. So inspite of typing the above pattern we can do …. ls chapter chap001 chap002 chap003 we can write the commands which is equally efficient and much sorter to type. ls chap??? This ? is used as wild cards. Some others are….. * any number of characters including none [ijk] a single character either I,j,k [a-z] a character in the range of a to z [!a-z] a character other than a to z P.C.P.Bhat/IISc Bangalore M11/V1/June 04/1
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Module 11: Search and Sort Tools - E-Courses

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