Surely there must be a way to execute a script from any location and get that script to output it's full path to stdout??
did you try what i have mentioned.
if I understood you correctly then that will work.
Code:
bash->cat a.sh
#!/usr/bin/ksh
echo "this is where you executed the script from -- $(dirname $0)"
bash->pwd
/home-dev
bash->/home-dev/a.sh
this is where you executed the script from -- /home-dev
bash->mkdir test
bash->cp a.sh test
bash->/home-dev/test/a.sh
this is where you executed the script from -- /home-dev/test
Slight change.
Within "ksh" this should catch virtually every way of invoking the script (including ./scriptname and through $PATH ) and return an absolute path to the script.
Code:
whence -p "${0}"
However if the script is invoked with a path containing "." or ".." the result of the whence still contains those characters.
Finding a clean path to the script itself involves cleaning up the result of "whence".
One tortuous way is to:
1) Find the inode number of the script (extract from "ls -id").
2) User "dirname" to extract the path to the script,
"cd" to the directory containing the script,
and then store the result of "pwd -P".
The "-P" switch to "pwd" eliminates the effect of links.
The "pwd" also eliminates "." and ".." from the middle of the directory name.
3) Finally use "find" from the stored "pwd -P" with -xdev and -inum switches
to find the raw path to the script.
Do you have PERL installed on your system? There are some functions that I have come across that can give you what you are looking for.
Code:
$ cat /tmp/getpath.pl
#!/usr/bin/perl
use strict;
use warnings;
print GetAbsoluteFileName($0) . "\n";
exit 0;
sub GetAbsoluteFileName {
my $passed_filename = shift;
my $absolute_filename;
use Cwd 'abs_path';
#expand tildes
$passed_filename =~ s{ ^ ~ ( [^/]* ) }
{ $1
? (getpwnam($1))[7]
: ( $ENV{HOME} || (getpwuid($<))[7]
)
}ex;
$absolute_filename = abs_path(ExpandEnvVars( $passed_filename ) );
return $absolute_filename;
}
#Takes a string and substitutes the value of the environment variable and returns the string back
sub ExpandEnvVars {
my $env_var = shift;
# expand variables in $env_var, if environment var does not exist, leave it alone
$env_var =~ s{
\$ # find a literal dollar sign
(\w+) # find a "word" and store it in $1
}{
no strict 'refs'; # for $$1 below
if (exists $ENV{$1}) {
$ENV{$1}; # expand environment variables only
} else {
"\$$1"; # environment var does not exist, so leave what they gave us
}
}egx;
return $env_var;
}
$ /tmp/getpath.pl
/tmp/getpath.pl
$ ls -1 /tmp/test1/getpath.pl
/tmp/test1/getpath.pl
$ /tmp/test1/getpath.pl
/tmp/test1/getpath.pl
$ export MYTEST=/tmp/test2
$ ls -1 $MYTEST/getpath.pl
/tmp/test2/getpath.pl
$ $MYTEST/getpath.pl
/tmp/test2/getpath.pl
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