UNIX for Dummies Questions & Answers

I have a list of numbers in the format:

5
4
15
65
32

I want to write code to manipulate the list and give me 100 - x such that the list looks like:

95
96
85
35
68

How do I go about doing that? Thanks!

Lots of ways. This seems to easy almost. Is this homework perchance?

Anyway, how is the input? Keyed line by line until quit; In a file; on the command line; something else?



Robin
Liverpool/Blackburn
UK

No it is not. I am doing this for my phd in genetics and I do not have a computer science background, hence the stupid question.

Apologies if I have been offensive, but can you answer the second question?

Also is there a preference to what language you would like any offers of code in?





Robin

The input is in a text file where the numbers are listed in a single column.

I would prefer awk or sed, but other languages would also work. Thanks a lot!

Well, I'm not great on awk, but I could give you a simple shell program to do this:-

Code:

#!/bin/ksh
cat $1 | while read val
do
   ((newval=100-$val))
   echo $newval
done

You would call this from the command line giving it your input file, e.g.

Code:

myscript  input-filename

The output would be written to the screen, so you can capture it in a file if you like as below:-

Code:

myscript  input-filename  >  output-filename

Be aware not to use the same file name from input & output or you will just get an empty file.


Does that suffice?


If the input file is very large, then awk would probably process much faster, but I will leave another to suggest code for that.



Robin
Liverpool/Blackburn
UK

Thanks. I copied and pasted the script into a text file called myscript.

However, when I do myscript inputfile.txt > outputfile.txt, I get the following error message:

-bash: myscript: command not found

How do I go about fixing that? Thanks!