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No newline at end of file

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# 1  
Old 09-25-2018
No newline at end of file
Hello all,


I have maybe a simple Problem - but I do not know to handle it.


All what I want, is to write a line to file without a newline at the end. It works with "echo -n" for all lines, but not for the last one. At the end of the file is always a "0a" (hex)


My small script:

Code:
a_string="Te{t"


printf "%s" $a_string >> /home//scripts/tmp/t.out

echo -n $a_string >> /home/scripts/tmp/t2.out

I tried it in These both ways, but everytime I get this:


Code:
0000000: 5465 7b74 0a                             Te{t.

What can I do to avoid the newline-character at end of file?
# 2  
Old 09-25-2018
What operating system are you using?

What shell are you using?

When I execute the script:
Code:
a_string="Te{t"


printf "%s" $a_string >> t.out

echo -n $a_string >> t2.out

on macOS High Sierra with either bash or ksh, I get the following output in your two output files:
Code:
$ od -bc t.out
0000000   124 145 173 164                                                
           T   e   {   t                                                
0000004
$ od -bc t2.out
0000000   124 145 173 164                                                
           T   e   {   t                                                
0000004
$

# 3  
Old 09-25-2018
In addition to what Don Cragun said: Which exact command die you use to get the hex dump output?
# 4  
Old 09-25-2018
Hello all,


I am using: RedHat Linux 3.10.0-862.el7.x86_64


I am working under: BASH_VERSION='4.2.46(2)-release'


The hex Editor is from vim (:%!xxd).

------ Post updated at 02:05 PM ------

Hello again,


if I do it with "od"-command - I will also get a result as Don Cragun described:


Code:
0000000 124 145 173 164
          T   e   {   t
0000004

------ Post updated at 02:06 PM ------

So, why are there different Outputs? (od and vim)?
# 5  
Old 09-25-2018
Quote:
Originally Posted by API
So, why are there different Outputs? (od and vim)?
I am not a vim developer so i can only speculate: vim - like vi - is not a hex-editor, but a text-editor. As such it (tries to) create(s) "well-formed" text files. A text file in UNIX has to have a newline character at the end of each line - if there is only one line, like in your case, then it has to be at the end, before the EOF-character.

I suppose that od is showing the file as it is (well, this in fact i know) and vim is "correcting" the file format as it opens it. I bet that when you save this to a different file and analyse that with od it will show the "extra" newline character the same way as vim does.

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
API
# 6  
Old 09-25-2018
@bakunin: Yes - this helps a lot. Thats means I have no Chance to see a file without a newline character in vim. With 'od' I will see the real world - as it is.

Thanks for that good Explanation.
# 7  
Old 09-26-2018
You can configure vim to not add the newline at the end. Unless your vim is already quite old, try to put into .vimrc a

Code:
set nofixendofline

Whether this is a wise choice, I'm not sure. In general, I do want my text editor to add the final newline, but this is up to you to decide.
This User Gave Thanks to rovf For This Post:
API
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