Characters in a single read


 
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# 1  
Old 08-21-2013
Characters in a single read

Hi,

I have the file which has the data :


Code:
accctaaccctaaccctaaccctaaccctaaccctaaccctaaccctaac
cctaacccaaccctaaccctaaccctaaccctaaccctaaccctaacccc
taaccctaaccctaaccctaaccctaacctaaccctaaccctaaccctaa
ccctaaccctaaccctaaccctaaccctaacccctaaccctaaccctaaa
ccctaaaccctaaccctaaccctaaccctaaccctaaccccaaccccaac
cccaaccccaaccccaaccccaaccctaacccctaaccctaaccctaacc
ctaccctaaccctaaccctaaccctaaccctaaccctaacccctaacccc
taaccctaaccctaaccctaaccctaaccctaaccctaacccctaaccct
aaccctaaccctaaccctcgcggtaccctcagccggcccgcccgcccggg
tctgacctgaggagaactgtgctccgccttcagagtaccaccgaaatctg

How many characters are in a single read?


Thanks.

Last edited by Scrutinizer; 08-21-2013 at 04:43 PM.. Reason: code tags
# 2  
Old 08-21-2013
Please use code tags as required by forum rules!

What do you mean by "a single read"? Reading into a shell variable (which shell)? Sngle variable or multiple? Into awk? In C?
# 3  
Old 08-21-2013
The question is nonsense. A program can ask for as much, or as little, as it needs to, and the amount it actually it gets may be equal to or less than that -- subject to things like interrupts and end-of-file.
# 4  
Old 08-21-2013
Each line is called a read, containing a number of characters.
Code:
accctaaccctaaccctaaccctaaccctaaccctaaccctaaccctaac
cctaacccaaccctaaccctaaccctaaccctaaccctaaccctaacccc
taaccctaaccctaaccctaaccctaacctaaccctaaccctaaccctaa
ccctaaccctaaccctaaccctaaccctaacccctaaccctaaccctaaa
ccctaaaccctaaccctaaccctaaccctaaccctaaccccaaccccaac
cccaaccccaaccccaaccccaaccctaacccctaaccctaaccctaacc
ctaccctaaccctaaccctaaccctaaccctaaccctaacccctaacccc
taaccctaaccctaaccctaaccctaaccctaaccctaacccctaaccct
aaccctaaccctaaccctcgcggtaccctcagccggcccgcccgcccggg
tctgacctgaggagaactgtgctccgccttcagagtaccaccgaaatctg


So, the question is : how many characters in a single read (line)?

Last edited by Scott; 08-23-2013 at 01:20 PM.. Reason: Code tags
# 5  
Old 08-21-2013
51. 50 characters, and one line-feed.

If it's windows text, it will be 52 -- 50 characters, one carriage return, one line feed.
# 6  
Old 08-21-2013
try something like:
Code:
awk '{print length}' infile

# 7  
Old 08-21-2013
I am new to Unix.
Can we use this command?

head -1 database.dat | wc
 
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