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sed -n 2,4p example

sed -n 2,4p example. sed –n /[aA]gg*[ar][ar]wal/p example. Records in a file in following format. Doe JOE 897-9090 40 North Bend, Cincinnati, Ohio 45212 Smith marry 345 New Road, Old City New York 345689 Doe, joe 40 North Bend Cincinnati Ohio 45122 Spears Britney

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sed -n 2,4p example

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  1. sed -n 2,4p example

  2. sed –n /[aA]gg*[ar][ar]wal/p example

  3. Records in a file in following format Doe JOE 897-9090 40 North Bend, Cincinnati, Ohio 45212 Smith marry 345 New Road, Old City New York 345689 Doe, joe 40 North Bend Cincinnati Ohio 45122 Spears Britney 531-6767 1 Star street Hollywood CA 78789

  4. Hints for hw2 • Transform record file into canonical form: • JOE DOE:40 NORTH BEND:CINCINNATI:OHIO:45212 • MARY SMITH:345 NEW ROAD:OLD CITY:NEW YORK: 345689: etc. the file has one line per address with fields separated by a colon • Addresses are cleaned-up, converted to upper case, sorted with duplicates removed

  5. Use filters sed, tr and sort to transform record file. Below are some of the steps involved. sed 's/^$/@/' myaddr \ | tr '\012@' ':\012' \ | sed 's/^://;s/:$//' \ | sort –u –t: +0 –3

  6. Use filter awk to convert transformed canonical file into desired address labels

  7. Passing Arguments to Shell Programs • To reference arguments from inside a shell program use $i where i is an integer from 0 to 9. The name of the script is represent by $0. $1, $2, …, $9 represent argument 1, argument 2, …, argument 9.

  8. Number of arguments • The number of arguments is represented by argv • argv[i] represents the ith argument, i.e., argv[i] is the same as $i, i = 1, …, 9.

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