New to Unix--- Post: 15396

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Top Forums UNIX for Dummies Questions & Answers New to Unix--- Post 15396 by peter.herlihy on Wednesday 13th of February 2002 04:03:14 PM

02-13-2002

Registered User

A question for you.... are there two columns of data - or is each row considered one entry. These things are very important things to know as it is handled quite differently.

If each row if one entry....(which I doubt but here goes) - the sort function is the one you need and it is simply used in this syntax:

sort inputfile > outputfile

Now if there are indeed 2 columns - and you want all data listed into one column sorted ..... i.e

01-xdsabcd
02-xdsabce
.....

Then you need to get the data into one column to start with as the sort function will use the entire row as one entry or a number of fields within one entry - but won't separate them out.

There may be a way using just the sort function to separate the two fields per row into a single list but I don't know it.

To get the data from the original file into a single list use this (there are heaps of ways to do this i.e. awk.....):

cut -c1-'11' inputfile > outputfile
cut -c'13'-'24' inputfile >> outputfile
sort outputfile > sorted_file

(You may or may not need to put the 11, 13 and 24 into quotes depending on your system.

This basically takes the first 11 characters on a row and puts it in a file. Then takes the next 11 (after the whitespace) and apends them to the end of this file. Then sorts the file in ascending order alphanumerically.

Hope this helps.

peter.herlihy

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LEARN ABOUT X11R4

look

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

NAME

     look -- display lines beginning with a given string

SYNOPSIS

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

DESCRIPTION

     The look utility displays any lines in file which contain string as a prefix.

     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.

     The following options are available:

     -b, --binary
	     Use a binary search on the given word list. If you are ignoring case with -f or ignoring non-alphanumeric characters with -d, the
	     file must be sorted in the same way. Please note that these options are the default if no filename is given. See sort(1) for more
	     information on sorting files.

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

     -f, --ignore-case
	     Ignore the case of alphabetic characters.

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

ENVIRONMENT

     The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of the look utility.  Their effect is described in environ(7).

FILES

     /usr/share/dict/words  the dictionary

EXIT STATUS

     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.

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.

     look uses a linear search by default instead of a binary search, which is what most other implementations use by default.

     The -a and --alternative flags are ignored for compatibility.

SEE ALSO

     grep(1), sort(1)

HISTORY

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

BUGS

     Lines are not compared according to the current locale's collating order.	Input files must be sorted with LC_COLLATE set to 'C'.

BSD
								   July 17, 2004							       BSD