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awk Command to add Carriage Return and Line Feed

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# 1  
Old 10-15-2018
awk Command to add Carriage Return and Line Feed
Hello,

Can someone please share a Simple AWK command to append Carriage Return & Line Feed to the end of the file, If the Carriage Return & Line Feed does not exist !

Thanks
# 2  
Old 10-15-2018
awk is not a good language for that, being it's not guaranteed to work at all on unterminated lines.

What have you tried?
# 3  
Old 10-15-2018
Hi,

I tried this , I am using cat command which is not efficient


Code:
cat source.txt | sed 's/[^[:print:]\r\t]//g' | perl -lpe 's/\x0d$//' > output.txt

# 4  
Old 10-15-2018
Why not the sed version?


Code:
sed '/\r$/!s/$/\r/' source.txt


or



Code:
sed 's/\r*$/\r/' source.txt

This User Gave Thanks to RudiC For This Post:
Neo
# 5  
Old 10-16-2018
With awk, try:
Code:
awk '{sub(/\r?$/,"\r")}1' file


--
Note: With sed, the use of \r with the s command is not standard, it is GNU sed only.
This User Gave Thanks to Scrutinizer For This Post:
Neo
# 6  
Old 10-16-2018
Unix text files have only a linefeed character to indicate a newline.
Perhaps you mean "add a missing linefeed to the end of the file"?
The consider this shell script
Code:
#!/bin/sh
# append a missing last newline
prtstdin(){
  while IFS= read line; do echo "$line"; done
  [ -z "$line" ]] || echo "$line"
}
if [ $# -eq 0 ]
then
  prtstdin
else
  for arg
  do
    prtstdin  <"$arg"
  done
fi

The script can be used like the "cat" program.
# 7  
Old 10-16-2018
Why not use the unix2dos and dos2unix programs or (more generally) recode? They were explicitly designed for the job you (mis-)use other innocent programs for.

I hope this helps.

bakunin
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