It is typical to have something like this in your cshrc file for setting the path:
set path = ( . $otherpath $path )
but, the path gets duplicated when you source your cshrc file multiple times, how do you prevent the duplication?
EDIT: This is one unclean way of doing it:
set localpaths = ( . $otherpaths )
echo ${path} | egrep -i "$localpaths" >& /dev/null
if ($status != 0) then
set path = ( . $otherpaths $path )
endif
you can use the following Perl script to prune paths of duplicates.
#!/usr/bin/perl
#
# ^^ ensure this is pointing to the correct location.
#
# Title: SLimPath
# Author: David "Shoe Lace" Pyke <eselle@users.sourceforge.net >
# : Tim Nelson
# Purpose: To create a slim version of my envirnoment path so as to eliminate
# duplicate entries and ensure that the "." path was last.
# Date Created: April 1st 1999
# Revision History:
# 01/04/99: initial tests.. didn't wok verywell at all
# : retreived path throught '$ENV' call
# 07/04/99: After an email from Tim Nelson <wayland@ne.com.au> got it to
# work.
# : used 'push' to add to array
# : used 'join' to create a delimited string from a list/array.
# 16/02/00: fixed cmd-line options to look/work better
# 25/02/00: made verbosity level-oriented
#
#
use Getopt::Std;
sub printlevel;
$initial_str = "";
$debug_mode = "";
$delim_chr = ":";
$opt_v = 1;
getopts("v:hd:l:e:s:");
OPTS: {
$opt_h && do {
print "\n$0 [-v level] [-d level] [-l delim] ( -e varname | -s strname | -h )";
print "\nWhere:";
print "\n -h This help";
print "\n -d Debug level";
print "\n -l Delimiter (between path vars)";
print "\n -e Specify environment variable (NB: don't include \$ sign)";
print "\n -s String (ie. $0 -s \$PATH:/looser/bin/)";
print "\n -v Verbosity (0 = quiet, 1 = normal, 2 = verbose)";
print "\n";
exit;
};
$opt_d && do {
printlevel 1, "You selected debug level $opt_d\n";
$debug_mode = $opt_d;
};
$opt_l && do {
printlevel 1, "You are going to delimit the string with \"$opt_l\"\n";
$delim_chr = $opt_l;
};
$opt_e && do {
if($opt_s) { die "Cannot specify BOTH env var and string\n"; }
printlevel 1, "Using Environment variable \"$opt_e\"\n";
$initial_str = $ENV{$opt_e};
};
$opt_s && do {
printleHere is a long one-liner without sorting:
set path = ( echo $path | tr ' ' '\n' | perl -e 'while (<>) { print $_ unless $s{$_}++; }' | tr '\n' ' ')
dr_peper,
I usually prefer to stick to scripting capabilities of the shell I am living in. Makes it more portable. So, I liked your solution using csh scripting. I just extended it to work on per dir in the localdirs to make it work for myself.
foreach dir ( $localdirs )
echo ${path} | egrep -i "$dir" >& /dev/null
if ($status != 0) then
set path = ( $dir $path )
endif
end