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https://life-is-command.com/linux-command-beginner/
bannerを直接修正して、#を*に表示を変えてみます。
まずは任意のエディタでbanner.cを開きます。
全文載せてみます。
$ cat -n banner.c
1 /*****************************************************************
2 *
3 * SYSVbanner.c
4 *
5 * This is a PD version of the SYS V banner program (at least I think
6 * it is compatible to SYS V) which I wrote to use with the clock
7 * program written by:
8 ** DCF, Inc.
9 ** 14623 North 49th Place
10 ** Scottsdale, AZ 85254
11 * and published in the net comp.sources.misc newsgroup in early July
12 * since the BSD banner program works quite differently.
13 *
14 * There is no copyright or responsibility accepted for the use
15 * of this software.
16 *
17 * Brian Wallis, brw@jim.odr.oz, 4 July 1988
18 *
19 *****************************************************************/
20
21 /* Changes by David Frey, david@eos.lugs.ch, 3 February 1997:
22 * 1. protoized and indented, 2. changed @ character to #
23 */
24
25 #include <stdio.h>
26 #include <string.h>
27
28 char *glyphs[] =
29 {
30 " ### ### ### # # ##### ### # ## ### ",
31 " ### ### ### # # # # ## # # # # ### ",
32 " ### # # ######## # ### # ## # ",
33 " # # # ##### # ### # ",
34 " ####### # # # #### # # ",
35 " ### # # # # # # # ## # ",
36 " ### # # ##### # ### #### # ",
37
38 " ## ## #",
39 " # # # # # # ",
40 " # # # # # # ",
41 " # # ### ### ##### ### ##### # ",
42 " # # # # # ### ### # ",
43 " # # # # # # ### # ",
44 " ## ## # ### # ",
45
46 " ### # ##### ##### # ####### ##### #######",
47 " # # ## # ## ## # # # ## # ",
48 "# # # # # # ## # # # # ",
49 "# # # # ##### ##### ####### ##### ###### # ",
50 "# # # # # # # ## # # ",
51 " # # # # # # # # ## # # ",
52 " ### ##### ####### ##### # ##### ##### # ",
53
54 " ##### ##### # ### # # ##### ",
55 "# ## # # # ### # # # #",
56 "# ## # # # ##### # #",
57 " ##### ###### ### # # ## ",
58 "# # # # ### # ##### # # ",
59 "# ## # # # # # # ",
60 " ##### ##### # # # # # ",
61
62 " ##### # ###### ##### ###### ############## ##### ",
63 "# # # # # ## ## ## # # #",
64 "# ### # # # # ## # ## # # ",
65 "# # # ## ####### # # ###### ##### # ####",
66 "# #### ######## ## # ## # # #",
67 "# ## ## ## ## ## # # #",
68 " ##### # ####### ##### ###### ######## ##### ",
69
70 "# # ### ## # # # ## ########",
71 "# # # ## # # ## #### ## #",
72 "# # # ## # # # # # ## # ## #",
73 "####### # #### # # # ## # ## #",
74 "# # # # ## # # # ## # ## #",
75 "# # # # ## # # # ## ### #",
76 "# # ### ##### # # ######## ## ########",
77
78 "###### ##### ###### ##### ######## ## ## #",
79 "# ## ## ## # # # ## ## # #",
80 "# ## ## ## # # ## ## # #",
81 "###### # ####### ##### # # ## ## # #",
82 "# # # ## # # # # # # # # # #",
83 "# # # # # # # # # # # # # # #",
84 "# #### ## # ##### # ##### # ## ## ",
85
86 "# ## ######## ##### # ##### # ",
87 " # # # # # # # # # # ",
88 " # # # # # # # # # # ",
89 " # # # # # # ",
90 " # # # # # # # ",
91 " # # # # # # # ",
92 "# # # ####### ##### # ##### #######",
93
94 " ### ",
95 " ### ## ##### #### ##### ###### ###### #### ",
96 " # # # # # # # # # # # # #",
97 " # # # ##### # # # ##### ##### # ",
98 " ###### # # # # # # # # ###",
99 " # # # # # # # # # # # #",
100 " # # ##### #### ##### ###### # #### ",
101
102 " ",
103 " # # # # # # # # # # # #### ",
104 " # # # # # # # ## ## ## # # #",
105 " ###### # # #### # # ## # # # # # #",
106 " # # # # # # # # # # # # # #",
107 " # # # # # # # # # # # ## # #",
108 " # # # #### # # ###### # # # # #### ",
109
110 " ",
111 " ##### #### ##### #### ##### # # # # # #",
112 " # # # # # # # # # # # # # #",
113 " # # # # # # #### # # # # # # #",
114 " ##### # # # ##### # # # # # # # ## #",
115 " # # # # # # # # # # # # ## ##",
116 " # ### # # # #### # #### ## # #",
117
118 " ### # ### ## # # # #",
119 " # # # # ###### # # # # # # # # # ",
120 " # # # # # # # # ## # # # #",
121 " ## # # ## ## # # # ",
122 " ## # # # # # # # # #",
123 " # # # # # # # # # # ",
124 " # # # ###### ### # ### # # # #"};
125
126
127 int main(int argc, char **argv)
128 {
129 int a, b, c, len, ind;
130 char line[80];
131
132 for (argv++; --argc; argv++) {
133 len = strlen(*argv);
134 if (len > 10)
135 len = 10;
136 for (a = 0; a < 7; a++) {
137 for (b = 0; b < len; b++) {
138 if ((ind = (*argv)[b] - ' ') < 0)
139 ind = 0;
140 for (c = 0; c < 7; c++) {
141 line[b * 8 + c] = glyphs[(ind / 8 * 7) + a][(ind % 8 * 7) + c]
142 }
143 line[b * 8 + 7] = ' ';
144 }
145 for (b = len * 8 - 1; b >= 0; b--) {
146 if (line[b] != ' ')
147 break;
148 line[b] = '\0';
149 }
150 puts(line);
151 }
152 puts("");
153 }
154 return 0;
155 }
ざっとソースを見たところで一旦エディタを終了します。
#を*に置換すれば良いので、
sedを使いましょう。
以下のコマンドで、banner.c内の30行目から124行目までにある#を*に置換します。
$ sed -e '30,124s/#/*/g' -i banner.c
makeしてbannerを実行してみます。
$ ./banner HELLO * * ******* * * ******* * * * * * * * * * * * * * * ******* ***** * * * * * * * * * * * * * * * * * * * * ******* ******* ******* *******
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