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!AWNov93/Goodies/RISC_OS/Examples/Example_7

This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.

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|  Archimedes World Guide to RISCOS_CLI      "VARIABLES"

|  Program : Example 7
   
|  Purpose : Illustrates the use of Aliases
|
|            N.B. vertical slash indicates a comment (like "REM" in BASIC)
 


Echo Alias checking takes place prior to commands in the kernel.
Echo DANGER! This means that the normal commands can be changed. Eg.
Echo
Echo *Set Alias$Greet Echo Hello %%*0
Echo *Greet Jim
Echo *Greet Fred and Sally
Echo
Set Alias$Greet Echo Hello %%*0
Greet Jim
Greet Fred and Sally


00000000  7c 20 20 41 72 63 68 69  6d 65 64 65 73 20 57 6f  ||  Archimedes Wo|
00000010  72 6c 64 20 47 75 69 64  65 20 74 6f 20 52 49 53  |rld Guide to RIS|
00000020  43 4f 53 5f 43 4c 49 20  20 20 20 20 20 22 56 41  |COS_CLI      "VA|
00000030  52 49 41 42 4c 45 53 22  0a 0a 7c 20 20 50 72 6f  |RIABLES"..|  Pro|
00000040  67 72 61 6d 20 3a 20 45  78 61 6d 70 6c 65 20 37  |gram : Example 7|
00000050  0a 20 20 20 0a 7c 20 20  50 75 72 70 6f 73 65 20  |.   .|  Purpose |
00000060  3a 20 49 6c 6c 75 73 74  72 61 74 65 73 20 74 68  |: Illustrates th|
00000070  65 20 75 73 65 20 6f 66  20 41 6c 69 61 73 65 73  |e use of Aliases|
00000080  0a 7c 0a 7c 20 20 20 20  20 20 20 20 20 20 20 20  |.|.|            |
00000090  4e 2e 42 2e 20 76 65 72  74 69 63 61 6c 20 73 6c  |N.B. vertical sl|
000000a0  61 73 68 20 69 6e 64 69  63 61 74 65 73 20 61 20  |ash indicates a |
000000b0  63 6f 6d 6d 65 6e 74 20  28 6c 69 6b 65 20 22 52  |comment (like "R|
000000c0  45 4d 22 20 69 6e 20 42  41 53 49 43 29 0a 20 0a  |EM" in BASIC). .|
000000d0  0a 0a 45 63 68 6f 20 41  6c 69 61 73 20 63 68 65  |..Echo Alias che|
000000e0  63 6b 69 6e 67 20 74 61  6b 65 73 20 70 6c 61 63  |cking takes plac|
000000f0  65 20 70 72 69 6f 72 20  74 6f 20 63 6f 6d 6d 61  |e prior to comma|
00000100  6e 64 73 20 69 6e 20 74  68 65 20 6b 65 72 6e 65  |nds in the kerne|
00000110  6c 2e 0a 45 63 68 6f 20  44 41 4e 47 45 52 21 20  |l..Echo DANGER! |
00000120  54 68 69 73 20 6d 65 61  6e 73 20 74 68 61 74 20  |This means that |
00000130  74 68 65 20 6e 6f 72 6d  61 6c 20 63 6f 6d 6d 61  |the normal comma|
00000140  6e 64 73 20 63 61 6e 20  62 65 20 63 68 61 6e 67  |nds can be chang|
00000150  65 64 2e 20 45 67 2e 0a  45 63 68 6f 0a 45 63 68  |ed. Eg..Echo.Ech|
00000160  6f 20 2a 53 65 74 20 41  6c 69 61 73 24 47 72 65  |o *Set Alias$Gre|
00000170  65 74 20 45 63 68 6f 20  48 65 6c 6c 6f 20 25 25  |et Echo Hello %%|
00000180  2a 30 0a 45 63 68 6f 20  2a 47 72 65 65 74 20 4a  |*0.Echo *Greet J|
00000190  69 6d 0a 45 63 68 6f 20  2a 47 72 65 65 74 20 46  |im.Echo *Greet F|
000001a0  72 65 64 20 61 6e 64 20  53 61 6c 6c 79 0a 45 63  |red and Sally.Ec|
000001b0  68 6f 0a 53 65 74 20 41  6c 69 61 73 24 47 72 65  |ho.Set Alias$Gre|
000001c0  65 74 20 45 63 68 6f 20  48 65 6c 6c 6f 20 25 25  |et Echo Hello %%|
000001d0  2a 30 0a 47 72 65 65 74  20 4a 69 6d 0a 47 72 65  |*0.Greet Jim.Gre|
000001e0  65 74 20 46 72 65 64 20  61 6e 64 20 53 61 6c 6c  |et Fred and Sall|
000001f0  79 0a 0a 0a                                       |y...|
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