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Either of these patches might work, although there are smarter ways

awk '{a[$2$3]++; b[$2$3]=$0}END{for(as in a) if(a[as]==1) print b[as]}' infile | sort -k2,2n

awk '{a[$2$3]++;...

If order is not important

awk '{a[$3]++; b[$3]=$0}END{for(as in a) if(a[as]==1) print b[as]}' infile

M4 1 3456
M8 2 7889
M5 2 456

shuf < inputfile | split -l 5000 sample.

This will create sample files sample.aa, sample.ab, sample.ac of 5000 randomly-chosen non repeating lines each.

I've used shuf on megabytes of data for...

The linux shuf utility can select random lines without repeats. Run it once and read three lines at a time from it in a loop.

shuf < inputfile | while read LINE1 && read LINE2 && read LINE3
do...

Hello sajmar,

Could you please try following and let me know if this helps you.
1st solution:

cat script.ksh
lines_in_file=`cat Input_file | wc -l`
file=Input_file
for val in `seq 1 5000`; ...

Tryawk 'FNR==NR {C[++j]=$1;next} {for (i=1;i<=j;i++) printf "%s ", $C[i]; printf "\n"}' file2 file1
1 0 0
2 1 0
1 0 2
2 1 0

Your requirement is unclear to me. In the example you gave there is no relation between column 2 and 3 in the output file..

---
*EDIT*
OK I see you have just edited your post #1 and now the...

You forgot to mention which OS and shell you are using. With bourne type shells, this might work:ls *.geno | while read FN; do awk -f example.awk $FN final.map > ${FN/geno/dat}; done

awk 'NR==1 { print > "M" ; print > "F"; next }
{ print > $4 }' inputfile

OK my mistake, try this:

awk '
{ V[NR]=$1 }
END {
srand()
for(i=1;i<=1440;) {
v=V[int(1+rand()*7200)]
if (!(v in N)) {
N[v]
print v
i++
}
}
}'...

Here is a solution using awk.

You didn't say column separator your file has - so I'm assuming it's a comma.

You can change the -F parameter according to you actual value, also note that some...

FWIW - "random" means any number in the range of valid values can occur any time. By saying "random with no duplicates" is not the same thing. Do not use this for encryption.