Re: Different meanings of $0 under the same operating system

...all of which can be summarised as: $0 represents the path by which *NIX locates the script

Furthermore, there is yet a 4th possibility - normally only noticed under one of the std *NIX shells whereby, if a script is 'dot'ted or 'source'ed, $0 is the name of the shell in which the 'dot'/'source' command is run - the perl equivalent of which is to do knowthyself from another script.

A user level that continues to overstate my experience :-))

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Re^2: Different meanings of $0 under the same operating system by Jorge_de_Burgos (Beadle) on Nov 03, 2009 at 18:51 UTC
...all of which can be summarised as: $0 represents the path by which *NIX locates the script I agree. Maybe we should promote a change in the perlvar definition of $0 I quoted at the very beginning of this node ("the name of the program being executed")?	[reply]
Re^2: Different meanings of $0 under the same operating system by JavaFan (Canon) on Nov 03, 2009 at 21:54 UTC
...all of which can be summarised as: $0 represents the path by which NIX locates the script* Except of course when it doesn't. `$ perl < knowthyself My name is -...` [download]	[reply] [d/l]
Re^3: Different meanings of $0 under the same operating system by Bloodnok (Vicar) on Nov 04, 2009 at 01:52 UTC
Ahh, but it is ... since, when used as a file name, '-' is an alternative id for stdin - witness most of the *NIX filter commands e.g. sort, join et al A user level that continues to overstate my experience :-))	[reply]
Re^4: Different meanings of $0 under the same operating system by JavaFan (Canon) on Nov 04, 2009 at 08:23 UTC
That many NIX filter commands take '-' to be STDIN is an application convention*. It's not something either the OS, or any of the standard libraries treat as special. In `perl < foo`, `-` isn't passed as an argument to any function of the `exec` family. It's not UNIX that is 'locating' the script.	[reply] [d/l] [select]
Re^4: Different meanings of $0 under the same operating system by ikegami (Patriarch) on Nov 04, 2009 at 02:36 UTC
I don't see your point. Are you saying opening '-' should give me the script, or are you saying that opening '-e' would normally give me the command line arguments? `>perl -le"print $0" -e >perl -lE"print $0" -e` [download]	[reply] [d/l]