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abs中的一个例子
在脚本里就得手动的去执行alias命令了：
1 #!/bin/bash
2 # alias.sh
3
4 shopt -s expand_aliases
5 # Must set this option, else script will not expand aliases.
6
7
8 # First, some fun.
9 alias Jesse_James='echo "\"Alias Jesse James\" was a 1959 comedy starring Bob Hope."'
10 Jesse_James
11
12 echo; echo; echo;
13
14 alias ll="ls -l"
15 # May use either single (') or double (") quotes to define an alias.
16
17 echo "Trying aliased \"ll\":"
18 ll /usr/X11R6/bin/mk* #* Alias works.
19
20 echo
21
22 directory=/usr/X11R6/bin/
23 prefix=mk* # See if wild card causes problems.
24 echo "Variables \"directory\" + \"prefix\" = $directory$prefix"
25 echo
26
27 alias lll="ls -l $directory$prefix"
28
29 echo "Trying aliased \"lll\":"
30 lll # Long listing of all files in /usr/X11R6/bin stating with mk.
31 # An alias can handle concatenated variables -- including wild card -- o.k.
32
33
34
35
36 TRUE=1
37
38 echo
39
40 if [ TRUE ]
41 then
42 alias rr="ls -l"
43 echo "Trying aliased \"rr\" within if/then statement:"
44 rr /usr/X11R6/bin/mk* #* Error message results!
45 # Aliases not expanded within compound statements.
46 echo "However, previously expanded alias still recognized:"
47 ll /usr/X11R6/bin/mk*
48 fi
49
50 echo
51
52 count=0
53 while [ $count -lt 3 ]
54 do
55 alias rrr="ls -l"
56 echo "Trying aliased \"rrr\" within \"while\" loop:"
57 rrr /usr/X11R6/bin/mk* #* Alias will not expand here either.
58 # alias.sh: line 57: rrr: command not found
59 let count+=1
60 done
61
62 echo; echo
63
64 alias xyz='cat $0' # Script lists itself.
65 # Note strong quotes.
66 xyz
67 # This seems to work,
68 #+ although the Bash documentation suggests that it shouldn't.
69 #
70 # However, as Steve Jacobson points out,
71 #+ the "$0" parameter expands immediately upon declaration of the alias.
72
73 exit 0 |
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发表于 2006-04-27 16:43
