LinuxQuestions.org - help...how to replace string using Perl

- Programming (https://www.linuxquestions.org/questions/programming-9/)

- - help...how to replace string using Perl (https://www.linuxquestions.org/questions/programming-9/help-how-to-replace-string-using-perl-639909/)

help...how to replace string using Perl

Hi,

I wish to create a .bat file with the following content:

Code:

Set new=bye

perl -pi -i.bak -e "s/hello/new/g" hello.txt

pause

I wish to replace the string "hello" to "bye" of a file hello.txt. However, the string keep changing to "new", I already assign new=bye (line1), so how can I replace the string "hello" to "bye"?

Million thanks in advance...I need this in urgent....

Drop the first line (Set new=bye), and make the second one look like this:

Code:

perl -i.bak -pe 's/hello/bye/g' hello.txt

I don't know anything about batch files or what that pause command is meant to do, for what that is worth. But the problem with the file as you wrote it seems to be that the Perl one-liner says "substitute any example of 'hello' with 'new' (including multiple times on one line)." The Perl one-liner is completely distinct from the Set command (I would think), so it can't "see" that you have assigned 'new' the value 'bye'. In any case, you shouldn't need two lines.

First post ...
... urgent ...

Homework ???.