I have a text file:
ifile.txt
1 4 22.0 3.3 2.3
2 2 34.1 5.4 2.3
3 2 33.0 34.0 2.3
4 12 3.0 43.0 4.4
I would like to convert it to a csv file:
ofile.txt
ID,No,A,B,C
1,4,22.0,3.3,2.3
2,2,34.1,5.4,2.3
3,2,33.0,34.0,2.3
4,12,3.0,43.0,4.4
I was trying with this, but not getting the result.
(echo "ID,No,A,B,C" ; cat ifile.txt) | sed 's/<space>/<comma>/g' > ofile.csv
6 Answers
Only sed and nothing else
sed 's/ \+/,/g' ifile.txt > ofile.csv
cat ofile.csv
1,4,22.0,3.3,2.3
2,2,34.1,5.4,2.3
3,2,33.0,34.0,2.3
4,12,3.0,43.0,4.4
awk may be a bit of an overkill here. IMHO, using tr for straight-forward substitutions like this is much simpler:
$ cat ifile.txt | tr -s '[:blank:]' ',' > ofile.txt
here is the awk version
awk 'BEGIN{print "ID,No,A,B,C"}{print $1","$2","$3","$4","$5}' ifile.txt
output:
ID,No,A,B,C
1,4,22.0,3.3,2.3
2,2,34.1,5.4,2.3
3,2,33.0,34.0,2.3
4,12,3.0,43.0,4.4
Try this ..
tr -s " " < ifile.txt | sed 's/ /,/g' > ofile.txt
OUTPUT
1,4,22.0,3.3,2.3
2,2,34.1,5.4,2.3
3,2,33.0,34.0,2.3
4,12,3.0,43.0,4.4
One possibility, not necessarily the best, is:
sed -e '1i\
ID,No,A,B,C' -e 's/[[:space:]]\{1,\}/,/g' ifile.txt
Insert the heading before line 1; change each sequence of one or more space-like characters to a comma. The line break is necessary in traditional (POSIX standard — in this case, BSD or Mac OS X) sed; GNU sed allows you to use:
/opt/gnu/bin/sed -e '1i\' -e 'ID,No,A,B,C' -e 's/[[:space:]]\{1,\}/,/g'
Output:
ID,No,A,B,C
1,4,22.0,3.3,2.3
2,2,34.1,5.4,2.3
3,2,33.0,34.0,2.3
4,12,3.0,43.0,4.4
Alternatively, and more simply, have sed deal with the file and use echo to add the header, as you did in outline:
{
echo "ID,No,A,B,C"
sed -e 's/[[:space:]]\{1,\}/,/g' ifile.txt
} > ofile.txt
On review, this is probably what I'd use.
Simply do it using awk command .
awk '{
printf("%d, %d, %.1lf, %.1lf,%.1lf\n", $1,$2,$3,$4,$5);
}' input.txt > output.csv
