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Merging two lines into one (awk)

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# 8  
Old 10-15-2019
Hi RavinderSingh13,

Nice find, the following matches the correct lines.

Code:
$ awk 'length($0)==80' unwrap2.txt
2019 Sep 28 10:47:24.695 hkaet9612 %ETHPORT-5-IF_DOWN_INTERFACE_REMOVED: Interfa
2019 Sep 28 10:47:24.699 hkaet9612 %ETHPORT-5-IF_DOWN_INTERFACE_REMOVED: Interfa
2019 Sep 28 10:47:24.699 hkaet9612 %ETHPORT-5-IF_DOWN_INTERFACE_REMOVED: Interfa

And the full statement works correctly.

Code:
awk '{printf("%s%s",length($0)==80?ORS:"",$0)} END {print ""}' unwrap2.txt
2019 Sep 28 10:47:24.695 hkaet9612 last message repeated 1 time
2019 Sep 28 10:47:24.695 hkaet9612 %ETHPORT-5-IF_DOWN_INTERFACE_REMOVED: Interface Ethernet1/45 is down (Interface removed)2019 Sep 28 10:47:24.699 hkaet9612 last message repeated 1 time
2019 Sep 28 10:47:24.699 hkaet9612 %ETHPORT-5-IF_DOWN_INTERFACE_REMOVED: Interfa
2019 Sep 28 10:47:24.699 hkaet9612 %ETHPORT-5-IF_DOWN_INTERFACE_REMOVED: Interface Ethernet1/46 is down (Interface removed)2019 Sep 28 10:47:24.702 hkaet9612 last message repeated 1 time

Can you please clarify the logic?

From what I understand, the following statement reads as follows:
Code:
length($0)==80?ORS:"",$0

- If length of string = 80 chars, add ORS (newline), else add ""

In this case, it should read - if length of str=80, add "", else add newline.

Thanks.
# 9  
Old 10-15-2019
Hello sand1234,

Here is the explanation of it:

As you could see there are 2 %s written in printf which are connected to following.

%s -----> length($0)==80?ORS:""
%s -----> $0

1st one is having condition check if length of current line is 80 then print a new line or print nothing.
2nd one is simply printing $0, since we have already set either we need to print new line for this line or not so no need for anything else here.

Thanks,
R. Singh
These 2 Users Gave Thanks to RavinderSingh13 For This Post:
Neo sand1234
# 10  
Old 10-16-2019
Hi RavinderSingh13,

That part is clear for me.

The part which is confusing is the logic after ?

I believe it should be as per RudiC logic.

Your logic
Code:
awk '{printf("%s%s",length($0)==80?ORS:"",$0)} END {print ""}' unwrap2.txt

RudiC logic
Code:
awk '{ORS=length==80?"":RS} 1' file
awk 'length==80 {ORS=""} 1; {ORS=RS}' file

Thanks.
# 11  
Old 10-16-2019
Hello sand1234,

Following is the complete explanation on same.

Code:
awk '                      ##Starting awk command here.
{
  ORS=length==80?"":RS     ##Setting ORS by checking condition if length of current line is 80 characters then set to NULL or set it as new line. 
                           ##Point to be noted here ORS and RS both have new line values by default from starting so setting them as per situation to either we want to print new line in output or not.
}
1
'  Input_file

Thanks,
R. Singh
These 2 Users Gave Thanks to RavinderSingh13 For This Post:
sand1234 wisecracker
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