find and replace in a text file

[petermichaux]

Hi,

I would like to learn how to find and replace in a text file. I use MS
Word for this because I know how to type white spaces in there. Often I
want to get rid of a trailing space or double paragraph returns so I do
things like

Find: " ^p"
Replace: "^p"

Find: "^p^p"
Replace: "^p"

What I would really like to be able to do is replace carriage returns
with line feeds for conversion from Linux to Mac.

Can anyone tell me how to start doing this in perl?

Thanks,
Peter

 

[Lars Eighner]

In our last episode,
the lovely and talented (e-mail address removed)
broadcast on comp.lang.perl.misc:

Hi,

I would like to learn how to find and replace in a text file. I use MS
Word for this because I know how to type white spaces in there. Often I
want to get rid of a trailing space or double paragraph returns so I do
things like

Find: " ^p"
Replace: "^p"

Find: "^p^p"
Replace: "^p"

What I would really like to be able to do is replace carriage returns
with line feeds for conversion from Linux to Mac.

Can anyone tell me how to start doing this in perl?

perl -pi -e "s/\r//" <insert your filespec here>

 

[John W. Krahn]

I would like to learn how to find and replace in a text file. I use MS
Word for this because I know how to type white spaces in there. Often I
want to get rid of a trailing space

perl -i.bak -lpe"s/ +$//" yourfile

or double paragraph returns

perl -i.bak -l -00pe1 yourfile

so I do things like

Find: " ^p"
Replace: "^p"

Find: "^p^p"
Replace: "^p"

What I would really like to be able to do is replace carriage returns
with line feeds for conversion from Linux to Mac.

perl -i.bak -pe"tr/\r/\n/" yourfile



John

 

[petermichaux]

Thanks for the suggestions! I will start playing with those commands.

-Peter

 

[John W. Krahn]

Thanks for the suggestions! I will start playing with those commands.

You are replying to your own message and thanking yourself?


John

 

[axel]

perl -i.bak -lpe"s/ +$//" yourfile



perl -i.bak -l -00pe1 yourfile



perl -i.bak -pe"tr/\r/\n/" yourfile

I think Linux to Mac would be 'tr/\n/\r/'.

Axel

 

[petermichaux]

From some things i read on the internet I'm not sure why tr/// is
suggested here instead of s///. I would not want any "/r" becoming "/n"

And why the -l flag?

Thanks,
Peter

 

[John W. Krahn]

I think Linux to Mac would be 'tr/\n/\r/'.

Yes *I* know that. However the OP says "replace carriage returns with line
feeds" so that is what I wrote.


John