1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
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
#!/bin/bash
name="rand"
version="1.0"
read -r -d '' help_message <<-EOF
Get a random number within an inclusive range
Usage: rand [OPTIONS] START END
Options:
-h, --help print this message and exit
-n N, --number N print N numbers (Default: 1)
-q, --quiet suppress error messages and prompts
-v, --verbose show additional messages
-V, --version print version number and exit
-w N, --width N print numbers zero-padded to N-wide (Default: 0)
EOF
source /usr/local/lib/mylib.bash
positional=()
quiet=0
verbose=0
width=1
number=1
while [[ $# -gt 0 ]]; do
case "$1" in
-h|--help)
help_msg
shift
;;
-n|--number)
if ! is_positive_integer "$2"; then
error_msg "Cannot set number of outputs to '${2}' (not an integer >= 1)"
fi
debug_msg "Setting number of outputs to ${2} (was ${number})"
number="$2"
shift; shift
;;
-q|--quiet)
debug_msg "Setting quiet option to 1 (was ${quiet})"
quiet=1
shift
;;
-v|--verbose)
debug_msg "Setting verbose option to 1 (was ${verbose})"
verbose=1;
shift
;;
-V|--version)
version_msg
;;
-w|--width)
if ! is_natural "$2"; then
error_msg "Cannot set zero-padding width to '${2}' (not an integer >= 0)"
fi
debug_msg "Setting zero-padding width to ${2} (was ${width})"
width="$2";
shift; shift
;;
*)
debug_msg "Argument '${1}' added to positional array"
positional+=("$1")
shift
;;
esac
done
# check arguments
if [[ ${#positional[@]} -lt 2 ]]; then
debug_msg "Expected 2 arguments (given ${#positional[@]})"
usage_msg
else
range_start="${positional[0]}"
range_end="${positional[1]}"
if ! is_integer "$range_start"; then
error_msg "Expected integer for range start (given '${range_start}')"
elif ! is_integer "$range_end"; then
error_msg "Expected integer for range end (given '${range_end}')"
elif [[ "$range_start" -ge "$range_end" ]]; then
error_msg "Expected ascending range (given '${range_start}' and '${range_end}')"
fi
fi
# main routine
code=0
if ! seq -f "%0${width}g" "$range_start" "$range_end" | shuf -n "$number"; then
code=1
fi
# return stored code
exit "$code"