Amiga command search path

Bloodwych · 13 December 2007, 15:08

A quick question for the technical gurus.

Does the Amiga search its internal ROM command list first, or last when a shell command is issued?

In other words, does it search through all the directories specified by "Path", then look at the internal commands, or is the internal the first one executed regardless of what's in the path directories?

Zetr0 · 13 December 2007, 15:27

@Bloodwych

If memory serves, Path is absolute, it checks there before anywhere else, this includes any mount entries to device / volume

I am unsure how a make-resident command would work, but I expect again Path would include it if not its volume / device etc..

Bloodwych · 13 December 2007, 15:57

I've just done a test - renamed another pure command "Resident" and placed it in the C directory, to see if it over-rides the internal command.

It still ran the internal command first, so there's my answer. I thought it would search the ROM/internal list first, then the specified path (RAM:, C: etc), but just wanted to check.

Resident commands stop multiple copies being held in RAM when they are in use, so I'm assuming they again would be executed before any path search is initiated to eliminate disk access and save memory load.

Thanks for the response Zetro.

Zetr0 · 13 December 2007, 16:31

@Bloodwych

You could always add RAM: to path... this would completely reduce any disk access... as it would execute the first command required that PATH came across wouldn't it?

more that welcome to my response my friend... I am above all things a POST whore

musashi5150 · 13 December 2007, 16:55

[OT]

Quote:

Originally Posted by Zetr0

I am above all things a POST whore

You certainly are my friend... your post count is ridiculous

[/OT]

Zetr0 · 13 December 2007, 17:00

@Musashi

yeah.... i cannot tell a lie.... PJ is sooooo jealous.... in fact soooo jealous he is like jelly jealous

Bloodwych · 13 December 2007, 19:18

Average of nearly 5 posts a day and joined in 2005!

I joined back in 2001 and have less than half the posts!

Zetro you are posting legend. Is there a day that goes by that you don't check out EAB?

Zetr0 · 13 December 2007, 19:21

@Bloodwych

a day not checking out EAB ???!?!??!

be still that blasphemy!!!!

Jesus!! thats a nightmarish thought.... I start getting withdrawal symptoms after 4 hours if i don't check for new posts....

I do have scairy dreams, that when i click it it says there are no - new posts..... and there are no more posts for you....

musashi5150 · 13 December 2007, 19:24

Quote:

Originally Posted by Zetr0

a day not checking out EAB ???!?!??! be still that blasphemy!!!!

Well said

meega · 17 December 2007, 20:27

Numpty numpty numpty numpty numpty numpty num....

Oh, don't mind me, I'm just numptying about.

Here's an experiment for you. Don't worry about the quote marks, don't enter them, they are only in what follows to emphasise what I'm doing.

. Make a new drawer somewhere on your Amiga, and call it "Testing" (I made one in the root of DH0: )
. Open the C drawer
. Select "List"
. Choose the menu option Icons/Copy
. The system will make Copy_of_List
. Drag Copy_of_List into Testing
. Select it and choose Icons/Rename and call it "dir" instead
. Open a Shell and make sure you are in the root of the drive
. Type "dir testing"
. You will see the output from Dir...
. Type "testing"
. Now type "dir"
. You will see the output from List...
. Type "/"
. Type "dir testing"
. You will see the output from Dir...

Hmmm...

If you want to see why this happens, type "path" into the Shell.

Numpty numpty numpty numpty numpty numpty num....

Bloodwych · 17 December 2007, 21:42

What are you on about meega?

Numptied out indeed!

"Dir" and "List" are external commands, not internal, so of course it will act like you're describing.

All you're doing is showing that shell searches the current directory first, before looking elsewhere as specified in "Path". By default, without any "Path" specified, I think it's current directory then C:

The thread was about if the internal ROM commands always come first, regardless if the same command is in the current directory or C: or whatever.

It's already been established through a simple test that the internal ROM command always comes first. Seems obvious I know, but I was just thinking out loud when I made this thread.

meega · 17 December 2007, 22:16

Both Dir and List are pure, and can be residented. I do, in fact, have most of the C drawer resident (I had to issue "Resident Dir REMOVE" before I did the above).

Make Dir resident, and then try. That'll also answer your question.

I did say "don't mind me" :-)

Bloodwych · 18 December 2007, 13:13

Ok, fair enough.

I didn't realize you had many of the pure commands resident.

13 December 2007, 15:08	#1
Bloodwych Moderator Join Date: Jun 2001 Location: I'm behind you! Posts: 3,763	Amiga command search path A quick question for the technical gurus. Does the Amiga search its internal ROM command list first, or last when a shell command is issued? In other words, does it search through all the directories specified by "Path", then look at the internal commands, or is the internal the first one executed regardless of what's in the path directories? Last edited by Bloodwych; 13 December 2007 at 15:28.

17 December 2007, 20:27	#10
meega Registered User Join Date: Dec 2007 Location: Oooh what a feeling yeaaah dancing on the ceiling Posts: 314	Numpty numpty numpty numpty numpty numpty num.... Oh, don't mind me, I'm just numptying about. Here's an experiment for you. Don't worry about the quote marks, don't enter them, they are only in what follows to emphasise what I'm doing. . Make a new drawer somewhere on your Amiga, and call it "Testing" (I made one in the root of DH0: ) . Open the C drawer . Select "List" . Choose the menu option Icons/Copy . The system will make Copy_of_List . Drag Copy_of_List into Testing . Select it and choose Icons/Rename and call it "dir" instead . Open a Shell and make sure you are in the root of the drive . Type "dir testing" . You will see the output from Dir... . Type "testing" . Now type "dir" . You will see the output from List... . Type "/" . Type "dir testing" . You will see the output from Dir... Hmmm... If you want to see why this happens, type "path" into the Shell. Numpty numpty numpty numpty numpty numpty num.... Last edited by meega; 17 December 2007 at 20:33.

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13 December 2007, 15:27	#2
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@Bloodwych If memory serves, Path is absolute, it checks there before anywhere else, this includes any mount entries to device / volume I am unsure how a make-resident command would work, but I expect again Path would include it if not its volume / device etc..

13 December 2007, 15:57	#3
Bloodwych Moderator Join Date: Jun 2001 Location: I'm behind you! Posts: 3,763	I've just done a test - renamed another pure command "Resident" and placed it in the C directory, to see if it over-rides the internal command. It still ran the internal command first, so there's my answer. I thought it would search the ROM/internal list first, then the specified path (RAM:, C: etc), but just wanted to check. Resident commands stop multiple copies being held in RAM when they are in use, so I'm assuming they again would be executed before any path search is initiated to eliminate disk access and save memory load. Thanks for the response Zetro.

13 December 2007, 16:31	#4
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@Bloodwych You could always add RAM: to path... this would completely reduce any disk access... as it would execute the first command required that PATH came across wouldn't it? more that welcome to my response my friend... I am above all things a POST whore

13 December 2007, 17:00	#6
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@Musashi yeah.... i cannot tell a lie.... PJ is sooooo jealous.... in fact soooo jealous he is like jelly jealous

13 December 2007, 19:18	#7
Bloodwych Moderator Join Date: Jun 2001 Location: I'm behind you! Posts: 3,763	Average of nearly 5 posts a day and joined in 2005! I joined back in 2001 and have less than half the posts! Zetro you are posting legend. Is there a day that goes by that you don't check out EAB?

13 December 2007, 19:21	#8
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@Bloodwych a day not checking out EAB ???!?!??! be still that blasphemy!!!! Jesus!! thats a nightmarish thought.... I start getting withdrawal symptoms after 4 hours if i don't check for new posts.... I do have scairy dreams, that when i click it it says there are no - new posts..... and there are no more posts for you....

17 December 2007, 21:42	#11
Bloodwych Moderator Join Date: Jun 2001 Location: I'm behind you! Posts: 3,763	What are you on about meega? Numptied out indeed! "Dir" and "List" are external commands, not internal, so of course it will act like you're describing. All you're doing is showing that shell searches the current directory first, before looking elsewhere as specified in "Path". By default, without any "Path" specified, I think it's current directory then C: The thread was about if the internal ROM commands always come first, regardless if the same command is in the current directory or C: or whatever. It's already been established through a simple test that the internal ROM command always comes first. Seems obvious I know, but I was just thinking out loud when I made this thread.

17 December 2007, 22:16	#12
meega Registered User Join Date: Dec 2007 Location: Oooh what a feeling yeaaah dancing on the ceiling Posts: 314	Both Dir and List are pure, and can be residented. I do, in fact, have most of the C drawer resident (I had to issue "Resident Dir REMOVE" before I did the above). Make Dir resident, and then try. That'll also answer your question. I did say "don't mind me" :-)

18 December 2007, 13:13	#13
Bloodwych Moderator Join Date: Jun 2001 Location: I'm behind you! Posts: 3,763	Ok, fair enough. I didn't realize you had many of the pure commands resident.

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