bash scripting

[jhurley03]

Something very handy to do in a Linux shell, is manipulating files and strings - essentially parsing data. Write a utility which will scan in a text file and search and replace strings. We also want to keep track of how many strings we've replaced.

I know that my command would look like this: <utility name> <filename> <stringToSearchFor> <stringToReplaceWith>

#!/bin/bash
# code for reading in a file line by line.
fileIn=$1

while read linein
do
echo $linein
done < $fileIn

${stringZ//$2/$3}

The above is the code that I have so far. As of now stringZ is nothing. I need it to be the line being read in. I also need to figure out how to write linein back into a file.

This is for a homework assignment. I'm not looking for someone to do it for me, I know that is against the rules anyway. I'm just looking for hints.

[Tanami]

It is all good and well to be writing a script to do this, but the program sed already does this just fine.

[markcole]

A pretty good place for bash scripting. If you run into problems with your script after you get it written, let us know and we can probably help.