Stripping ^M from your files

時間 2019-11-06

標籤 stripping files 简体版

原文原文鏈接

If you have transferred a file from MS Windows to FreeBSD, you might find the file looks like this:

<html>^M
^M
<head>^M
<title>The FreeBSD Diary -- Article Maintenance</title>^M
<meta name="description" content="BLANK">^M
<meta name="keywords" content="FreeBSD">^M

That "^M" is control-M, which is a carriage return, and is not needed in Unix file systems. To remove this extra character, run the following script:html

perl -pi -e "s:^V^M::g" <filenames>

where ^V is actually control-V and ^M is actually control-M (you must type these yourself, don't just copy and paste this command). Control-V will not be displayed on your screen.ui

<filenames> is the list of files to be converted.this

NOTE: I'm told that if you use ASCII mode to transfer your files, this problem won't occur.spa

Other options

I like people writing in with options. Here are two other ways to get rid of the ^M characters:

Marc Silver writes that this will work:

cat <filename1> | tr -d "^V^M" > <newfile>

Remember to actually type control-V then control-M. Don't just copy and paste the above.unix

Trevor R.H. Clarke gave this example:

sed -e "s/^V^M//" <filename> > <output filename>

And remember to actually type control-V then control-M. Don't just copy and paste the above.code

Mario Sergio Fujikawa Ferreira writes of this vi solution.

hit the ESC key

:%s/^V^M//

remember the colon ( : ) at the start of step two.htm

Marius Strom mentions this port:
```
cd /usr/ports/converters/unix2dos make && make install
```
This port will also install dos2unix, which is useful for removing the control-M characters.ip
Oliver Crow reports this:
```
col <infile >outfile
```
[ed. note: make sure infile and outfile are not the same file or you'll lose the contents]rem
KeMpKeS reports this:
Here's one you might want to add to the removing ^M from files page: open the file in pico, make a trivial change, then change it back (like add a space then delete it), then try to quit pico. When it asks you if you want to save changes, say yes. That''ll do it.

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