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This is one method to determine if two files have the same size and then act upon it:

fs1=`wc -c test1`
fs1="${fs1##+([[:space:]])}"
fs1=`echo $fs1 | cut -d ' ' -f1`

fs2=`wc -c test2`...

For also positive numbers use:

$ sed -e 's/^[^-0-9].*$/>>/' infile

Hi Gery,

Try with:

$ cat infile
geometry,geometry_vertex_count,Id,strnum,platecode,datatype,dtnum,refnum,appearance,disappeara,color,geogdesc,datatype_ft_style,import_notes...

while read line
do
num=`echo ${line} | awk -F "." ' { print $1 } '`
egrep "^${num} " file2 | cut -d" " -f2 >> output
done < file1

You need to flip file1 and file2 around. try:
awk 'NR==FNR{A[$1]=$2;next} {i=int($1+.5)} i in A {print A[i]}' file2 file1

It is because for some entries in fileA there is no match in fileB and then those lines do not get printed. If you would use:
awk 'NR==FNR{A[$1]=$2;next} {i=int($1+.5);print A[i]}' file2 file1Those...

Hi, you could for example give every intermediate value the value of the previous known value:
awk 'NR==FNR{if(!i)i=$1; while(i<=$1)A[i++]=$2;next} {print A[int($1+.5)]}' fileB.txt fileA.txt

try this:

awk ' NR==1 {printf("%s", $0); next}
{printf("\n%s %s", $1, $2);extra=$3 }
END {print " ", extra} ' inputfile > ourputfile