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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 #904
Difficulty: Medium
The benchmark used in the LINPACK Benchmark is to solve a dense system of nonlinear equations.
True or False?

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diff3(1)						      General Commands Manual							  diff3(1)

NAME
diff3 - 3-way differential file comparison SYNOPSIS
file1 file2 file3 DESCRIPTION
compares three versions of a file, and prints disagreeing ranges of text flagged with these codes: all three files differ file1 is different file2 is different file3 is different The type of change required to convert a given range of a given file to some other is indicated in one of these ways: Text is to be appended after line number n1 in file f, where f = or Text is to be changed in the range line n1 through line n2. If n1 = n2, the range can be abbreviated to n1. The original contents of the range follows immediately after a indication. When the contents of two files are identical, the contents of the lower-numbered file is suppressed. Produces a script for the editor that can be used to incorporate into file1 all changes between file2 and file3 (see ed(1)); i.e., the changes that normally would be flagged and Produces a script to incorporate only changes flagged Produces a script to incorporate only changes flagged Produces a script that will incorporate all changes between file2 and file3, but treat overlapping changes (that is, changes that would be flagged with in normal listing) differently. The overlapping lines in both files will be inserted by the edit script bracketed by and lines. Produces a script that will incorporate only changes flagged , but treat these changes in the manner of option. The following command applies the resulting script to file1. EXTERNAL INFLUENCES
International Code Set Support Single- and multi-byte character code sets are supported. WARNINGS
Text lines that consist of a single period defeat Files longer than 64K bytes do not work. FILES
SEE ALSO
diff(1). diff3(1)

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