hi all,

i found NAME=${0##*/} in a script.
i given this coomand in my unix box(presently in ksh).

echo ${0##*/} it returned ksh.
the purpose of the above is to return the shell name or more than that.

do you have any more information like this, please share with me.

one more query
what is set -xv and +xv.
i read the above with "man". but i am not clear with that.

I guess as they say, RTFM more carefully. Just kidding.

NAME=${0##*/}
simply gets the name of the currently executing script. The $0 is what does it, and the rest strips of the leading path names. It's useful when the script name is supposed to different things depending on how its invoked. For instance, if you have a softlink to your script named "foo" and another softlink named "bar", then your script can do print out "FU" instead of "Beyond All Recognition". Or something.

set -xv +xv are shorthand for
The first turns on "eXecution debugging". Every command that is executed, and after parsing, is printed to stderr. The second turns on "Verbose mode" which prints to stderr every line that is read in and before being parsed, whether or not it is executed.

I guess as they say, RTFM more carefully. Just kidding.

NAME=${0##*/}
simply gets the name of the currently executing script. The $0 is what does it, and the rest strips of the leading path names. It's useful when the script name is supposed to different things depending on how its invoked. For instance, if you have a softlink to your script named "foo" and another softlink named "bar", then your script can do print out "FU" instead of "Beyond All Recognition". Or something.

set -xv +xv are shorthand for
The first turns on "eXecution debugging". Every command that is executed, and after parsing, is printed to stderr. The second turns on "Verbose mode" which prints to stderr every line that is read in and before being parsed, whether or not it is executed.

NAME=${0##*/} is a fancy awy of doing "basename $0"
$0 is a special variable that hold the name of the script (or if you doit in a loguin shell, the name of the shell), including the full path to the executable
the other ##, well, is complicated and must admit i dont know why it works, to advanced for me
if you want, you can read the "basename" man page to get a grasp of what it does

yeah Broli,
i do it.

Thanks for your update

iam using ksh, i doesn't find in man page for basename about ##.

No, ## is described in the man page for the shell. The basename command is just a different way to do this particular substitution.