source: vis_dev/vis-2.3/share/help/aliasCmd.txt @ 93

Last change on this file since 93 was 14, checked in by cecile, 13 years ago

vis2.3
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1
2  alias - provide an alias for a command
3     _________________________________________________________________
4
5   alias [-h] [<name> [<string>]]
6
7   The "alias" command, if given no arguments, will print the definition of all
8   current aliases.
9
10   Given a single argument, it will print the definition of that alias (if
11   any). Given two arguments, the keyword "name" becomes an alias for the
12   command string "string", replacing any other alias with the same name.
13
14   Command options:
15
16   -h
17          Print the command usage.
18
19   <name>
20          Alias
21
22   <string>
23          Command string
24
25   It is possible to create aliases that take arguments by using the history
26   substitution mechanism. To protect the history substitution character `%'
27   from immediate expansion, it must be preceded by a `\' when entering the
28   alias.
29
30   For example:
31
32   vis> alias read read_\%:1 \%:2.\%:1
33   vis> read blif lion
34 
35
36   will create an alias `read', execute "read_blif lion.blif".
37
38   And...
39
40  vis> alias echo2 "echo Hi ; echo \%* !"
41  vis> echo2 happy birthday
42 
43
44   will print:
45
46  Hi
47  happy birthday !
48 
49
50   CAVEAT: Currently there is no check to see if there is a circular dependency
51   in the alias definition. e.g.
52
53  vis> alias foo "print_network_stats; print_network; foo"
54 
55
56   creates an alias which refers to itself. Executing the command "foo" will
57   result an infinite loop during which the commands "print_network_stats" and
58   "print_network" will be executed.
59     _________________________________________________________________
60
61   Last updated on 20100410 00h02
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