I having a file with three fields name,Rev_ration and sync which is :(colon delimeted) as shown below:


##Check as per revision 67
##Check as per revision 56

Initially I am replacing the : which is in square brackets to !. SecondlyExecuting my AWK. Third I am replacing the ! which is in square brackets to : I am trying below code:

sed 's/\([[0-9]\+\)!\([0-9]\+]\)/\1:\2/g' t5 >> t6
awk -F: '/^$/ /^#/ {c=$0; sub(/#+/,"", c); next} 
                {print $1,$2,"- message", "\"" c "\""}' t6 >> t7
sed 's/\([[0-9]\+\)!\([0-9]\+]\)/\1:\2/g' t7 >> t8

Getting syntax error

Above code is working fine but not able to ignore the empty lines

I need to get rid of empty lines inside the input file.

Desired output

JOe:4.8:7 - message "Increase "
jonny:[5:9]:[7:0] - message "Check as per revision 67"
Salman:q[0:234]: - message "Check as per revision 56"

How to club all three commands and how to get rid of empty lines.. How to fix that with the code shown above

  • @Kusalananda it got to know how to fix that issue but not able to remove empty lines.
    – Kavitha
    Jun 16 '20 at 6:50

As it doesn't seem that you're actually doing anything with your :-delimited fields, we may concentrate on the lines starting with ##, pick out the text from them, and insert the text on the following lines.

Using only sed:

$ sed '/^$/d; /^##/{ s///; h; d; }; G; s/\n\(.*\)/ - message "\1"/' file
JOe:4.8:7 - message "Increase "
jonny:[5:9]:[7:0] - message "Check as per revision 67"
Salman:q[0:234]:5 - message "Check as per revision 56"

The sed expression deletes empty lines with /^$/d. It then saves any text after ## into the hold space with h (after deleting the initial ##, replacing whatever may be stored in the hold space already). For any other line that is not empty or a line that starts with ##, it appends the text from the hold space with G and modifies it so that the added text is prefixed with - message " and terminated by ".

  • In my above code itself how can I do that by ignoring the empty lines in AWK command because the input files which I am going to be used is some what different
    – Kavitha
    Jun 16 '20 at 6:56
  • @Kavitha Empty lines matches the regular expression ^$. In awk, you could ignore empty lines with /^$/ { next }. My answer produces the correct result for your given text though, so if your actual data looks different, please update the data in the question.
    – Kusalananda
    Jun 16 '20 at 7:00
  • I add it with my above code but getting syntax error
    – Kavitha
    Jun 16 '20 at 7:17
  • @Kavitha Yes, because you forgot the { next } bit. Also, if you update the code in the question, what's the point of the question?
    – Kusalananda
    Jun 16 '20 at 7:24

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