CODEWITHSUNDEEP
unixsed
theObserver
theObserver

Reputation: 127

How to stop SED from stripping the final line feed from text files

I am using sed to update various date formats within a text file and appending the result to another file.

The file dates are stored as YYYMMDD etc so I am replacing the YYYMMDD with the actual date.

The only issue is the final line of each file is missing a new line character, meaning the last and first lines are incorrectly aligned.

File 1:

00 YYMMDD TEST
05 3452256 MMDD 33456
80 File Trailer

File 2:

00 YYMMDD TEST
05 445674 MMDD 234456
80 File Trailer

What I need is the YYMMDD and MMDD updated with the current date and both files appended together like this:

00 180129 TEST
05 3452256 0129 33456
80 File Trailer
00 180129 TEST
05 445674 0129 234456
80 File Trailer

But what I am actually getting is:

00 180129 TEST
05 3452256 0129 33456
80 File Trailer00 180129 TEST
05 445674 0129 234456
80 File Trailer

Code:

YYYY=$(date +"%Y")
YY=$(date +"%y")
MM=$(date +"%m")
DD=$(date +"%d")
HH=$(date +"%H")
MI=$(date +"%M")
SS=$(date +"%S")
JJJ=$(date +"%j")

sed -- "s/yyyymmdd/$yyyyMMdd/g;s/yymmdd/$yyMMdd/g;s/mmdd/$mmdd/g;s/yyjjj/$yyjjj/g" "$full_path" >> $deploy_path

Does anyone know why this is happening and if here is an easy fix?

Edit

It turns out the problem was with the source files I was using. Specifically: the file trailers were missing a CRLF. So the code above is working fine.

Upvotes: 2

Views: 90

Answers (1)

Walter A
Walter A

Reputation: 20032

I first wanted to suggest to replace "$full_path" with <(cat "$full_path"; echo), but than realized that your "$full_path" will have 2 files and my fix is for one file only.
You can use sed for appending a newline with $s/$/\n/, so change your command into

sed -- "\$s/$/\n/; s/yyyymmdd/$yyyyMMdd/g;s/yymmdd/$yyMMdd/g;s/mmdd/$mmdd/g;s/yyjjj/$yyjjj/g" "$full_path" >> $deploy_path

Upvotes: 1

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