Windows & DOS: Issues & Discussions

awk 'NR==1{
  print;nf=NF;next
}
FNR==1{next}
nf!=NF{
  system("rm -f outfile"); exit
}1' file1.txt file2.txt file3.txt > outfile

NR==1{
  print;nf=NF;next
}
FNR==1{next}
nf!=NF{
  system("del -f outfile"); exit
}1

[mute@geek ~/temp/sameeribraimo]$ cat merge.awk
BEGIN {
        outfile=ARGV[--ARGC]
        print "output: " outfile
}
NR==1{nf=NF;a[r++]=$0}
NF!=nf{exit 1}
FNR!=1{a[r++]=$0}
END {for (i=0;i<r;i++) print a[i] > outfile}

[mute@geek ~/temp/sameeribraimo]$ gawk -f merge.awk file?.txt output.txt
output: output.txt
[mute@geek ~/temp/sameeribraimo]$ cat output.txt
a b c
1 1 1
2 2 2
3 3 3
4 4 4
5 5 5
6 6 6
7 7 7
8 8 8
9 9 9
10 10 10