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Full Discussion: write string of characters to file
Top Forums UNIX for Dummies Questions & Answers write string of characters to file Post 302314084 by jim mcnamara on Thursday 7th of May 2009 10:46:04 AM
Old 05-07-2009
Looks like DNA bases...

Code:
getconf LINE_MAX

This shows the longest possible string command line utilties can read from a file without err. On a lot of systems this is 2048. If your DNA-base string is longer than 2048 characters then you need C or perl, or python.

less than 2048:
Code:
awk ' { str=$0}
END{
 for(i=1; length(str) - i > 35; i++)
 {
	printf("%s\n%s\n%s\n%s\n",
		"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~",
		"@read",
		substr(str, i, 36),		
		"+read"
		)
 } } ' dnastringfile

Last edited by jim mcnamara; 05-07-2009 at 01:56 PM..
 

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LEARN ABOUT OPENDARWIN

look

LOOK(1) 						    BSD General Commands Manual 						   LOOK(1)

NAME

     look -- display lines beginning with a given string

SYNOPSIS

     look [-df] [-t termchar] string [file ...]

DESCRIPTION

     The look utility displays any lines in file which contain string as a prefix.  As look performs a binary search, the lines in file must be
     sorted.

     If file is not specified, the file /usr/share/dict/words is used, only alphanumeric characters are compared and the case of alphabetic char-
     acters is ignored.

     Options:

     -d      Dictionary character set and order, i.e. only alphanumeric characters are compared.

     -f      Ignore the case of alphabetic characters.

     -t      Specify a string termination character, i.e. only the characters in string up to and including the first occurrence of termchar are
	     compared.

     The look utility exits 0 if one or more lines were found and displayed, 1 if no lines were found, and >1 if an error occurred.

FILES

     /usr/share/dict/words  the dictionary

SEE ALSO

     grep(1), sort(1)

COMPATIBILITY

     The original manual page stated that tabs and blank characters participated in comparisons when the -d option was specified.  This was incor-
     rect and the current man page matches the historic implementation.

HISTORY

     A look utility appeared in Version 7 AT&T UNIX.

BSD
								   June 14, 1993							       BSD
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