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it is beautiful, thank you!

Thank you so much. They all work! Really appreciate all the helps!

I really need to learn more about regular expressions...

Hi there,
I am with this one column input text file to change layout, please help. Thanks. I have awk, sed.

$ cat input

Median
1.0
2.3
3.0

Median
35.0
26.3
45.7
10.1
63.1

Median...

Thanks, Rudi. I got all my solutions now. Thank you!

Thank you, Rudi.

I think Pamu's solution works. (Thank you Pamu.)

Yes, transpose it and use awk with NF=22, NR=3278824 is the direction of solution in my mind. Actually, pamu's solution is done by transpose it with awk and also count it by awk!!! GREAT!

3405
The attach is the first 8192 chars of the first 4 lines. I just need to test the script you provided through and through.

Thanks, your code works on my example. But it outputs the matching char one at a line. I need to do something like | tr -d '\n' to remove the newline of every line to get it to print out onto one...

Thanks!
My bad! The example I have up there is just for example. The matching actually has no pattern at all. I don't know where the matching(s) is/are happening and I don't know how many of them...

I have a file with 22 lines. Each line has only 5 different chars, no white space, and each line is 3,278,824 in length. The 5 chars is "-", "A", "B", "C", "D".
Below is an example of the first 25...

I have a starting partial solution:

awk 'min[$4]=="" || $2<min[$4] {min[$4]=$2;lines[$4]=$1" "$2}END{for (j in lines) print j"\t"lines[j]}' inputfile
-------------------------------------
"abc" ...

You are right. I didn't assume different scenarios.

VirtualBox:~/Desktop$ sort -t$'\t' -k2,2 temp.txt
inode=3512 size=103334 fd=2
inode=3513 size=139474 fd=1
inode=3513 size=139474 fd=2
inode=3513 ...

Thanks, Jim
There might be a typo, but the follow code works:

while read line; do
declare -a arr=($line)

start=${arr[4]}
end=${arr[5]}
id=${arr[[10]}
...
done < inputfile

Sorry, this is not what I want.
I need the values of current line be assigned to variables, work with these variables before next line, and so on...
I will edit my post to make it clear. Sorry for...

Hi, there
I have a file with tab and space as field separator. I need to assign values to variables then work with them, line by line. The code I wrote only works when each line has only one word....