Sort roman numerals Post: 302508505

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Top Forums Shell Programming and Scripting Sort roman numerals Post 302508505 by drl on Monday 28th of March 2011 10:27:40 AM

03-28-2011

Registered User

Hi.

The utility msort is in the Debian GNU/Linux repositories. It often makes life easy for complex sorting situations:

Code:

#!/usr/bin/env bash

# @(#) s2	Demonstrate sort of roman numerals, msort.
# http://freshmeat.net/projects/msort

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
pe() { for i;do printf "%s" "$i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for i;do printf "%s" "$i";done; printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && . $C ;msort
msort --version | head -1

FILE=${1-data3}
pl " Data file $FILE:"
cat $FILE

pl " Results, msort on roman numerals, field 2:"
msort --quiet --line --position 2 --comparison-type numeric --number-system roman $FILE

exit 0

producing:

Code:

% ./s2

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version"ker|rel
er|rel, machine: Linux, 2.6.32-5-686, i686
Distribution        : Debian GNU/Linux 6.0 
GNU bash 4.1.5
msort 8.53

-----
 Data file data3:
file ii suffix
file i suffix
file iv suffix
file iii suffix
file c suffix

-----
 Results, msort on roman numerals, field 2:
file i suffix
file ii suffix
file iii suffix
file iv suffix
file c suffix

If you do not use Debian, see the msort home page as noted in the script.

Best wishes ... cheers, drl

PS. I had trouble with older versions of msort on 64-bit Debian (lenny), but the version of msort on the current stable edition (squeeze) seems to work correctly, as noted above.

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LEARN ABOUT MOJAVE

basename

BASENAME(1)						    BSD General Commands Manual 					       BASENAME(1)

NAME

     basename, dirname -- return filename or directory portion of pathname

SYNOPSIS

     basename string [suffix]
     basename [-a] [-s suffix] string [...]
     dirname string

DESCRIPTION

     The basename utility deletes any prefix ending with the last slash '/' character present in string (after first stripping trailing slashes),
     and a suffix, if given.  The suffix is not stripped if it is identical to the remaining characters in string.  The resulting filename is
     written to the standard output.  A non-existent suffix is ignored.  If -a is specified, then every argument is treated as a string as if
     basename were invoked with just one argument.  If -s is specified, then the suffix is taken as its argument, and all other arguments are
     treated as a string.

     The dirname utility deletes the filename portion, beginning with the last slash '/' character to the end of string (after first stripping
     trailing slashes), and writes the result to the standard output.

EXAMPLES

     The following line sets the shell variable FOO to /usr/bin.

	   FOO=`dirname /usr/bin/trail`

DIAGNOSTICS

     The basename and dirname utilities exit 0 on success, and >0 if an error occurs.

SEE ALSO

     csh(1), sh(1)

STANDARDS

     The basename and dirname utilities are expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

BSD
								  April 18, 1994							       BSD