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Write a Bash script named addcol.sh that reads a spreadsheet from standard input, adds a column, and writes the result to standard output. The input and output format is a single CSV (comma separated value) file. Each line of the file is a row in the spreadsheet, and columns are separated by commas. The first line of the file contains column headers. The script should take a single command line argument, which is an item name. This will be the name of the column to add to the spreadsheet, and the name of the new column header. The remaining column data should be added as follows. The first column in each row contains a filename, called the key file. If the key file exists, and contains a line of the form item-new column value where item is the item name given on the command line, then "new column value" should be the new column value. Otherwise, the new column value should be the empty string.

Write a Bash script named addcol.sh that reads a spreadsheet from standard input, adds a column, and writes the result to standard output. The input and output format is a single CSV (comma separated value) file. Each line of the file is a row in the spreadsheet, and columns are separated by commas. The first line of the file contains column headers. The script should take a single command line argument, which is an item name. This will be the name of the column to add to the spreadsheet, and the name of the new column header. The remaining column data should be added as follows. The first column in each row contains a filename, called the key file. If the key file exists, and contains a line of the form item-new column value where item is the item name given on the command line, then "new column value" should be the new column value. Otherwise, the new column value should be the empty string.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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6 addcol.sh Write a Bash script named addcol.sh that reads a spreadsheet from standard input, adds a column, and writes the result to standard output. The input and output format is a single CSV (comma separated value) file. Each line of the file is a row in the spreadsheet, and columns are separated by commas. The first line of the file contains column headers. The script should take a single command line argument, which is an item name. This will be the name of the column to add to the spreadsheet, and the name of the new column header. The remaining column data should be added as follows. The first column in each row contains a filename, called the key file. If the key file exists, and contains a line of the form item=new column value where item is the item name given on the command line, then "new column value" should be the new column value. Otherwise, the new column value should be the empty string. 6.1 Assumptions You may assume the following, which may simplify your script. • The key files will contain only lines of the form identifier-data Identifiers will not be repeated within a key file.
Transcribed Image Text:6 addcol.sh Write a Bash script named addcol.sh that reads a spreadsheet from standard input, adds a column, and writes the result to standard output. The input and output format is a single CSV (comma separated value) file. Each line of the file is a row in the spreadsheet, and columns are separated by commas. The first line of the file contains column headers. The script should take a single command line argument, which is an item name. This will be the name of the column to add to the spreadsheet, and the name of the new column header. The remaining column data should be added as follows. The first column in each row contains a filename, called the key file. If the key file exists, and contains a line of the form item=new column value where item is the item name given on the command line, then "new column value" should be the new column value. Otherwise, the new column value should be the empty string. 6.1 Assumptions You may assume the following, which may simplify your script. • The key files will contain only lines of the form identifier-data Identifiers will not be repeated within a key file.
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