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Top Forums Shell Programming and Scripting Need help with Unix assignmet Post 302138214 by barbus on Sunday 30th of September 2007 11:00:52 AM
Old 09-30-2007
Need help with Unix assignmet

Hi i am a newbie to UNIX and i am undertaking a course, i have some exercises and one of them is as follows:

Create a file with x amount of lines in it, the content of your choice.
Write a script named 'firstline' that takes two arguments. The first being a line of text, the second being your newly created file. The script should take the first argument and insert it into the very top (the first line) of the file named in your second argument.

Assume the file is called “textfile1” and has the contents
Text one
Text two
Text three
Text n

How do i redirect a variable that hold text (or a string of characters) to the 1st line of the file, without effect the current 1st line.

The variable doesn’t need any input from the user, so it assume it will be as follows:
Mytext=”hello people” this being the 1st argument $1

Not I am NOT permitted to use either SED or AWK.

i am not looking for the full answer please, just a hint on how to start this, i am trying to learn after all Smilie

Any help will be greatly appreciated.

Last edited by barbus; 09-30-2007 at 12:13 PM..
Test Your Knowledge in Computers #106
Difficulty: Easy
A kernel is at the heart of the Linux OS; and this kernel acts as an interface between the user and underlying hardware.
True or False?

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XmTextReplaceWcs(3X)													      XmTextReplaceWcs(3X)

XmTextReplaceWcs - A Text function that replaces part of a wide character string in a Text widget SYNOPSIS
#include <Xm/Text.h> void XmTextReplaceWcs (widget, from_pos, to_pos, wcstring) Widget widget; XmTextPosition from_pos; XmTextPosition to_pos; wchar_t *wcstring; DESCRIPTION
XmTextReplaceWcs replaces part of the wide character string in the Text widget. The character positions begin at zero and are numbered sequentially from the beginning of the text. An example text replacement would be to replace the second and third characters in the text string. To accomplish this, the from_pos parameter must be 1 and the to_pos parameter must be 3. To insert a string after the fourth character, both the from_pos and to_pos param- eters must be 4. This routine calls the widget's XmNvalueChangedCallback and verification callbacks, either XmNmodifyVerifyCallback or XmNmodifyVerifyCall- backWcs, or both. If both verification callback lists are registered, the procedures of the XmNmodifyVerifyCallback list are executed first and the resulting data is passed to the XmNmodifyVerifyCallbackWcs callbacks. Specifies the Text widget ID Specifies the start posi- tion of the text to be replaced Specifies the end position of the text to be replaced Specifies the wide character string value to be added to the Text widget For a complete definition of Text and its associated resources, see XmText(3X). SEE ALSO
XmText(3X), XmTextReplace(3X) XmTextReplaceWcs(3X)

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