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Homework and Emergencies Homework & Coursework Questions Loop to Convert a list from an input file and output it to another file Post 302798579 by Don Cragun on Wednesday 24th of April 2013 06:16:11 PM
Old 04-24-2013
Quote:
Originally Posted by AliTheSnake
Alright. The
Code:
>

deletes the content in the file
Code:
>>

appends it.
I changed > to >>
now i got this :


screenshot in attachments.
Something wrong in the tabling script?
What am i missing.
So it looks like you're getting all of your output (although the sample in your assignment showed two lines of headings and your output only shows one). It looks like your code to convert Centigrade to Fahrenheit is working correctly. So, what problem do you have left besides centering your output values under the appropriate headings? (You do realize that since the output values you've calculated vary from one to four characters, you will need to vary the number of spaces or tabs printed in front of the calculated values to center them, don't you?) I assume that you don't have access to the tabs utility yet, so you're probably better off just using spaces in your output rather than tabs. (And even if you do have access to the tabs utility, I wouldn't recommend using it for something like this.)

Do you know how to get bash to tell you how many characters are stored in a variable? Do you know what output column is at the center of each of your headings? With these two pieces of information, can you calculate how many leading spaces or tabs you need to print before the Centigrade value? (I'm not asking if you can do these calculations using bash; I'm asking if you understand the arithmetic required to determine how to center the strings you'll be printing.)

Do you know how to do integer arithmetic operations inside bash (without invoking bc or expr) yet? If not, it isn't a big deal, you have shown that you can use bc to perform any calculations you need to perform; it is just easier to use the bash built-in arithmetic evaluation tools. Do you know how to use a for loop in bash? Do you know how to use echo to output some characters without a trailing newline?

PS When posting code and sample input and output, please don't do anything special with the fonts. Using arial (a variable width font) instead of the default constant width font will make it almost impossible to get things lined up here.
 

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newform(1)						      General Commands Manual							newform(1)

NAME
newform - change or reformat a text file SYNOPSIS
[file]... DESCRIPTION
reads lines from the named files, or standard input if no input file is named, and reproduces the lines on standard output. Lines are reformatted in accordance with command line options in effect. Command line options can appear in any order, can be repeated, and can be intermingled with the optional files. Command line options are processed in the order specified. This means that option sequences such as yield results different from Options are applied to all files on the command line. Options recognizes the following options: Same as except characters are appended to the end of a line. Truncate n characters from the beginning of the line when the line length is greater than the effective line length (see The default is to truncate the number of characters necessary to obtain the effective line length. The default value is used when with no n is used. This option can be used to delete the sequence numbers from a COBOL program as follows: The must be used to set the effective line length shorter than any existing line in the file so that the option is activated. Change the prefix/append character to k. The default character for k is a space. Same as except that characters are truncated from the end of the line. Write the tab specification format line on the standard output before any other lines are output. The tab specification format line which is printed will correspond to the format specified in the option. If no option is specified, the line which is printed contains the default specification of Input tab specification: expands tabs to spaces, according to the tab specifications given. The tabspec recognizes all tab specification forms described in tabs(1). In addition, tabspec can be in which assumes that the tab specification is to be found in the first line read from the standard input (see fspec(4)). If no tabspec is given, tabspec defaults to A tabspec of expects no tabs; if any are found, they are treated as Set the effective line length to n characters. If n is not entered, defaults to 72. The default line length without the option is 80 characters. Note that tabs and backspaces are treated as single characters (use to expand tabs to spaces). Output tab specification: replaces spaces with tabs, according to the tab specifications given. The tab specifications are the same as for If no tabspec is given, tabspec defaults to A tabspec of means that no spaces will be converted to tabs on output. Prefix n characters (see to the beginning of a line when the line length is less than the effective line length. The default is to prefix the number of characters necessary to obtain the effective line length. Shear off leading characters on each line up to the first tab and place up to 8 of the sheared characters at the end of the line. If more than 8 characters (not counting the first tab) are sheared, the eighth character is replaced by a and any characters to the right of it are discarded. The first tab is always discarded. An error message and program exit occur if this option is used on a file without a tab on each line. The characters sheared off are saved internally until all other options specified are applied to that line. The characters are then added at the end of the processed line. For example, to convert a file with leading digits, one or more tabs, and text on each line, to a file beginning with the text, all tabs after the first expanded to spaces, padded with spaces out to column 72 (or truncated to column 72), and the leading digits placed starting at column 73, the command would be: RETURN VALUE
returns one of the following values: No errors encountered. An error occurred. DIAGNOSTICS
All diagnostics are fatal. was called with a bad option. There was no tab on one line. Self-explanatory. A line exceeds 512 characters after being expanded in the internal work buffer. A tab specification is incorrectly formatted, or specified tab stops are not ascending. A tabspec read from a file (or standard input) must not contain a tabspec referencing another file (or standard input). WARNINGS
normally only keeps track of physical characters; however, for the and options, keeps track of backspaces in order to line up tabs in the appropriate logical columns. does not prompt the user if a tabspec is to be read from the standard input (by use of or If the option is used, and the last option specified was and was preceded by either a or a the tab specification format line will be incor- rect. SEE ALSO
csplit(1), tabs(1), fspec(4). newform(1)
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