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There might be a performance problem also, because grep might do the comparisons one after the other, like a loop would do, for each line. Anchoring makes each comparison only a little faster.
If...

You could try putting those strings in a file, like so:

ILMN_2258774
ILMN_1700477
...
ILMN_1805992

Then you can extract like so:
grep -f stringfile test1>test2

For accuracy it would be...

Try:
awk '{for(i=1; i<=NF; i++) $i+=0}1' CONVFMT="%.3f" file

awk uses format specifiers very similar to C.

printf "%.3f %.3e\n", 1234.12345 1234.12345
1234.123 1.234e+03

So,
awk '{printf("%s %s %.3f %.3e\n", $1, $2, $3, $4)}' inputfile >...

Try:
awk '{printf "%s %s %.3f %.3e\n", $1, $2, $3, $4}' file
or
awk '{$3=sprintf("%.3f",$3); $4=sprintf("%.3e",$4)}1' file

I sense a slight ambiguity here and i want to clarify it before anything else:

do you want to wait for the completion of all the 20 commands before you start the next batch of twenty or do you...

awk '$1 = $1 + 0' CONVFMT="%.3g" infile > outfile

Another approach:
awk 'NR>1{print $3 RS $5}' file

If order of values don't matter, then something like

awk 'BEGIN{getline}{printf("%s\n%s\n",$3,$5)} file.txt

or

awk 'BEGIN{getline}{printf("%s\n%s\n",$3,$5)} file.txt | sort


the...

Hi,

Try this one,

cut -c75000-85000 file

Cheers,
Ranga:-)

Not everyone has dos2unix, but everyone has tr.

These files are Windows text files full of carriage-return garbage and won't work properly with non-Windows tools until they're fixed.

tr -d '\r' < wingarbage > normaltext

how about uname -a?

---------- Post updated at 12:30 PM ---------- Previous update was at 11:26 AM ----------

Not knowing your system means I can't use the following 5-second solutions:
Shell...

If the only commas in the input occur in that last field:

tr -s , \\n < file | awk 'NF>1 {p=$0} NF==1 {f=$0; $0=p; $NF=f} 1'

f=final field's value
p=prefix of records with common origin

...

You get the additional rows when you skip the '/^\s*$/' line.

The line /^\s*$/ means any line that just contains white spaces or empty

If you notice your input file the format is as follows...

code: (without the header)
awk 'NR>1{c3=$2*$2;c4=(1-$2)*(1-$2);c5=1-c3-c4;print $0,c3,c4,c5}' yourFile

output:
a 1 1 0 0
b 20 400 361 -760
c 30 900 841 -1740
d 3 9 4 ...

sed -e 's/\([ACGT][ACGT]\)/\1 /g' yourfile