merging two lines in a file - UNIX for Dummies Questions & Answers

thaduka · #1 (**permalink**) 07-11-2007

Hi All,

I want to merge two lines in a file till the end of the file. So what could be the command to get so.

say file name : sample.txt
contents:
country=1
send apps =1 rece=2
country=2
send apps =3 rece=3
..

...

output:
country=1;send apps =1 rece=2
country=2;send apps =3 rece=3

thanks
Kumar

vino · #2 (**permalink**) 07-11-2007

Here is one way.

Code:

while read line
do
  OUT=${line}
  read line
  OUT=${OUT};${line}
  echo ${OUT} >> output.txt
done <input.txt

hemangjani · #3 (**permalink**) 07-11-2007

Code:
awk 'ORS=NR%2?";":"\n"' sample.txt

syndex · #4 (**permalink**) 07-11-2007

Quote:

Originally Posted by hemangjani

Code:
awk 'ORS=NR%2?";":"\n"' sample.txt

Could explain the awk line.

I'm so confused on awk and sed. Is there a good tutorial that explains what all that gibberish means?

Shell_Life · #5 (**permalink**) 07-11-2007

Vino,
The line:

Code:

OUT=${OUT};${line}

Should be replaced by:

Code:

OUT=${OUT}${line}

Hemangjani,
If the input file has an odd number of records, your output does not produce
a line break for the last record.

Here is another way:

Code:

typeset -i mLineCnt=0
mOutLine=''
while read mLine
do
  mLineCnt=${mLineCnt}+1
  mOutLine=${mOutLine}${mLine}
  if [ ${mLineCnt} -eq 2 ]; then
    echo ${mOutLine}
    mOutLine=''
    mLineCnt=0
  fi
done < input_file
if [ ${mLineCnt} -ne 0 ]; then
  echo ${mOutLine}
fi

vino · #6 (**permalink**) 07-11-2007

Quote:

Originally Posted by Shell_Life

Vino,
The line:

Code:

OUT=${OUT};${line}

Should be replaced by:

Code:

OUT=${OUT}${line}

And where do I introduce the ; as shown in the expected output

country=1;send apps =1 rece=2
country=2;send apps =3 rece=3

I should have double quoted the RHS of OUT=${OUT};${line}

Shell_Life · #7 (**permalink**) 07-11-2007

You are correct, Vino, it should be single or double quoted:

Code:

OUT=${OUT}';'${line}

Since the requirement asked for a semi-colon, mine should have it:

Code:

mOutLine=${mOutLine}';'${mLine}

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