Print the last line or change the last line

[foxidrive]

Hi,

I have text files (in Windows 7) in which the last line is just a CRLF (an empty line).


My script using GnuSED V4.2.1 removes CRLF lines but I wish to keep the last line - for appending a set of files into a single file.
Is there some way I can modify the last line so that it isn't deleted, perhaps by adding > to it, or can I add a blank line at the end of each file using the same sed command?


This is my script:

sed -e "/^ *$/d" -e "/^$/d" "file.txt" > "newfile.txt"



Thanks
Mic

[foxidrive]

[foxidrive]

Sorry for the duplicates - I wanted to clarify that the lines I refer to as CRLF are blank lines with no characters, just a CRLF.

An example is a file format like this:

===start file===
Book: A brief history of time

Author: You know who

Synopsis: 42

===end file===

and similar files with the same format and and I'd like to end up with this

===start file===
Book: A brief History of time
Author: You know who
Synopsis: 42

Book: Flight
Author: Another author
Synopsis: A book about flight

===end file===


Hi,

I have text files (in Windows 7) in which the last line is just a CRLF (an empty line) but there are other blank lines in it.
My script using GnuSED V4.2.1 removes blank lines that only have a CRLF but I wish to keep the last blank line.

[Stephane Chazelas]

2012-06-08 04:12:47 +1000, foxidrive:
[...]

> sed -e "/^ *$/d" -e "/^$/d" "file.txt" > "newfile.txt"

sed '$q;/[^ ]/!d'

--
Stephane

[foxidrive]

On Friday 08/06/2012 05:18, Stephane Chazelas wrote:
> 2012-06-08 04:12:47 +1000, foxidrive:
> [...]
>> sed -e "/^ *$/d" -e "/^$/d" "file.txt" > "newfile.txt"
>
> sed '$q;/[^ ]/!d'

I'm not sure that it has the same function, Stephane. I tried to adapt it to GnuSED but didn't have success.



--
Mic

[Stephane Chazelas]

2012-06-09 04:51:05 +0000, foxidrive:

That should work with any shell. The quoting is Bourne-like
shell syntax as found on all Unix-like systems.

What you want is the string "$q;/[^ ]/!d" to be passed as the
one and only argument to sed.

It says that, on the last line ($), sed should quit (q) (after
having displayed the line).

For any other line, unless it matches /[^ ]/ (contains any
non-space), delete it (d). That is print all the lines that
contain at least one non-space characters.

--
Stephane

[foxidrive]

On Sunday 10/06/2012 05:32, Stephane Chazelas wrote:
> 2012-06-09 04:51:05 +0000, foxidrive:
>> On Friday 08/06/2012 05:18, Stephane Chazelas wrote:
>>> 2012-06-08 04:12:47 +1000, foxidrive:
>>> [...]
>>>> sed -e "/^ *$/d" -e "/^$/d" "file.txt" > "newfile.txt"
>>>
>>> sed '$q;/[^ ]/!d'
>>
>> I'm not sure that it has the same function, Stephane. I tried
>> to adapt it to GnuSED but didn't have success.
>
> That should work with any shell. The quoting is Bourne-like
> shell syntax as found on all Unix-like systems.
>
> What you want is the string "$q;/[^ ]/!d" to be passed as the
> one and only argument to sed.

Thank you for your explanation.

This functions without an error in GnuSED but it removes the last line which is a blank line.
In the last command line below (type b.txt) I would like the blank line to remain in between each output of the sed command line.


c:\Files\Lists>type a.txt
Book: "The Taming of the Shrew"

Author: William Shakespeare

The main plot depicts the courtship of Petruchio, a gentleman of Verona,
and Katherina, the headstrong, obdurate shrew. Initially, Katherina is
an unwilling participant in the relationship, but Petruchio tempers her
with various psychological tormentsùthe "taming"ùuntil she becomes a
compliant and obedient bride.

c:\Files\Lists>sed "$q;/[^ ]/!d" a.txt
Book: "The Taming of the Shrew"
Author: William Shakespeare
The main plot depicts the courtship of Petruchio, a gentleman of Verona,
and Katherina, the headstrong, obdurate shrew. Initially, Katherina is
an unwilling participant in the relationship, but Petruchio tempers her
with various psychological torments-the "taming"-until she becomes a
compliant and obedient bride.

c:\Files\Lists>sed "$q;/[^ ]/!d" a.txt >>b.txt

c:\Files\Lists>sed "$q;/[^ ]/!d" a.txt >>b.txt

c:\Files\Lists>type b.txt
Book: "The Taming of the Shrew"
Author: William Shakespeare
The main plot depicts the courtship of Petruchio, a gentleman of Verona,
and Katherina, the headstrong, obdurate shrew. Initially, Katherina is
an unwilling participant in the relationship, but Petruchio tempers her
with various psychological tormentsùthe "taming"ùuntil she becomes a
compliant and obedient bride.
Book: "The Taming of the Shrew"
Author: William Shakespeare
The main plot depicts the courtship of Petruchio, a gentleman of Verona,
and Katherina, the headstrong, obdurate shrew. Initially, Katherina is
an unwilling participant in the relationship, but Petruchio tempers her
with various psychological tormentsùthe "taming"ùuntil she becomes a
compliant and obedient bride.

c:\Files\Lists>

It seems to be difficult.

> It says that, on the last line ($), sed should quit (q) (after
> having displayed the line).
>
> For any other line, unless it matches /[^ ]/ (contains any
> non-space), delete it (d). That is print all the lines that
> contain at least one non-space characters.



--

Mic

[foxidrive]

On Sunday 10/06/2012 11:55, foxidrive wrote:
> On Sunday 10/06/2012 05:32, Stephane Chazelas wrote:
>> 2012-06-09 04:51:05 +0000, foxidrive:
>>> On Friday 08/06/2012 05:18, Stephane Chazelas wrote:
>>>> 2012-06-08 04:12:47 +1000, foxidrive:
>>>> [...]
>>>>> sed -e "/^ *$/d" -e "/^$/d" "file.txt" > "newfile.txt"
>>>>
>>>> sed '$q;/[^ ]/!d'
>>>
>>> I'm not sure that it has the same function, Stephane. I tried
>>> to adapt it to GnuSED but didn't have success.
>>
>> That should work with any shell. The quoting is Bourne-like
>> shell syntax as found on all Unix-like systems.
>>
>> What you want is the string "$q;/[^ ]/!d" to be passed as the
>> one and only argument to sed.
>
> Thank you for your explanation.
>
> This functions without an error in GnuSED but it removes the last line which is a blank line.
> In the last command line below (type b.txt) I would like the blank line to remain in between each output of the sed command line.

My mistake, it works well. My a.txt file had a trailing crlf but not a blank line. I added a blank line and it works fine.

Thank you Stephane.

--
Mic