Shell Programming and Scripting

Hi,

I am trying to search and replace a value in a file. File contains data which is stated below

ruby ./scripts/CreateUsage.rb Cloud_Computing_001

Cloud_Computing_001 is the 3rd column of the file. I want to replace this Cloud_Computing_001 with the runtime value. Next time i want to change the new replaced value with another runtime value. So it should dynamically find the values in the 3rd column of a file and replace that value with runtime value.

For this i used some script like below

Code:

if [ "$1" = "" ]; then        ## No parameters were entered
  echo "Enter value:"
  read mInputValue
  echo "You entered: "$mInputValue
  b=`cat ssss|awk '{print $3}'`
  sed -i.bak "s|${b}|${mInputValue}|g" ssss

This is working if a file contains single line . Suppose if a file contains multiple lines. It should replace all the lines. which is nothappening now , could some one help me out on this.

try this

Code:

`awk ' NR==1 { print $2}'  filename`

How to dynamically find and replace the value.
Can anyone help me on this.

Your request is very difficult to read and to understand. Meaningful samples of e.g. the file and the desired output had helped a lot, as is also stated in the forum rules.

If I apply some wild guessing to your request, I come to the conclusion that you want to modify file ssss by changing the 3rd field of every row to the value the user entered, either as a command line parameter (which, BTW, is lost in your above code snippet), or as the keyboard input interactively. Would this do the task:

Code:

awk '{$3=mInpVal}' mInpVal=$mInputValue ssss

?

The first step is to explain the problem. Give a few scenarios with input and output. Show what happens in the real world situation. Then the gurus (not me) can help figure it out. Or once you actually write down the examples, the answer might come to you all by your self.