#! /bin/sh
: &&O='cd .' || exec /bin/sh "$0" $argv:q # we're in a csh, feed myself to sh
$O || exec /bin/sh "$0" "$@"		  # we're in a buggy zsh
#########################################################################
#	showlink	Displays all links to a file			#
#									#
#	Created by S.R. van den Berg, The Netherlands			#
#									#
#	If you can figure out and understand everything in this script, #
#	you can consider yourself an awk guru!				#
#########################################################################
#$Id: showlink,v 1.6 1994/05/26 14:11:24 berg Exp $

defaults=.etc

echo=echo		# /bin/echo
test=test		# /bin/test
ls=ls			# /bin/ls
awk=awk			# /usr/bin/awk
dirname=dirname		# /bin/dirname
basename=basename	# /bin/basename
showlink=showlink	# SedHomeDir/.bin/showlink

EX_USAGE=64

$test 0 = $# && $echo "Usage: showlink filename ..." 1>&2 && exit $EX_USAGE

case $# in
  1) if $test -d "$1"
     then
	cd "$1"
	set dummy *
	shift
	$test ! -d $defaults -a -d ../$defaults && cd ..
	for a in "$@"
	do $ls -di $defaults/$a .bin*/$a */$a 2>/dev/null
	done
     else
	file=`$basename "$1"`
	cd=`$dirname "$1"`
	$test ! -d $defaults -a -d ../$defaults && cd ..
	$ls -di $defaults/$file .bin*/$file */$file 2>/dev/null
     fi;;
  *) $ls -di "$@";;
esac | $awk '
BEGIN {
    count[0]=0;
  }
  { for(start=1;substr($0,start++,1)==" ";);
    fname[$1"#"(++count[$1])]=substr($0,length($1)+start);
  }
END {
    for(inode in count)
     { if((i=count[inode])>1)
	{ bn=fname[inode"#"1];
	  for(start=length(bn);start>0&&"/"!=substr(bn,start,1);start--);
	  printf("Links to %s:\n",(bn=substr(bn,start+1)));
	  lbn=length(bn="/"bn);linel=0;
	  for(;i;i--)
	   { if((lcn=length(cn=fname[inode"#"i]))>lbn)
		if(substr(cn,lcn+1-lbn,lbn)==bn)
		   lcn=length(cn=substr(cn,1,lcn+1-lbn));
	     if(!linel)
		printf(" >");
	     else if(linel+lcn>=76)
	      { printf("\n >");linel=0;
	      }
	     linel+=19;
	     if((lcn-=18)>0)
	      { linel+=lcn;linel+=lcn=19-lcn%19;
	      }
	     else
		lcn=0;
	     if(linel>76)
		linel=76;
	     printf("%"lcn"s %18s","",cn);
	   }
	  printf("\n");
	}
     }
  }'