我正在编写一个 shell 脚本，它会自动启动两个脚本，以便记录我正在进行的研究项目的数据，然后当它们结束时，它会自动为数据创建一个目录并将数据移动到该目录中。该程序创建一个名为“Trials”的文件夹（如果该文件夹尚不存在），并在 Trial 文件夹中检查名为“Trial$n”的文件夹，其中 n 是从 0 开始的递增整数。其想法是使每次运行程序时创建的文件夹名称都会增加 1。除了命名系统之外，整个程序运行良好。当我第一次编写代码时，它可以正常工作，但是当我删除文件夹“Trial0...Trial2”时，无论试验 0 到 2 的文件夹是否存在，下一个要创建的文件夹将是“folder3”。这种情况一直持续到创建文件夹“Trial13”为止，现在程序每次都会简单地覆盖“Trial13”。这是我的代码，相关行是 149:187
1 #!/bin/bash
2 #-----------------------------------------------------------------------------
3 #The purpose of this script it to automate and streamline the data collection
4 #and analysis process for the touchless respitatory monitor. The script will
5 #prompt you for the paths of the themral camera executable
6 #(seek_viewer, usually in the libseek-thermal library), the path of the
7 #main python script (SingleThreadedFaceDetectionV6), and the path of
8 #removable media to which the files will be saved. It will then give you
9 #command prompts to guide you through the process and put a fully-formatted
10 #data folder in the removable media such that the folder is immediately
11 #compatable with the MATLAB script on PC.
12
13 #NOTE: Sometimes the thermal camera won't initialize properly and the program
14 #needs to be restarted until it works.
15
16 #Author: Caleb Schreier
17 #Date: 7 June 2022
18 #OS: Raspbian GNU/Linux 10 (buster)
19 #Kernel: Linux 5.10.103-v7l+
20 #Architecture: arm
21 #Python: 3.7
22 #Numpy: 1.22.4
23 #-----------------------------------------------------------------------------
24
25 #Import Settings
26 source launcherSettings.txt
27
28 #If setting don't exist, prompt user for settings
29 if [ "$remember" != "y" ];
30 then
31
32 echo
33 echo Please format paths as /folder/.../targetfolder
34 echo
35 echo Specify path to folder containing Thermal Camera Executable
36 echo \(libseek_viewer\)
37 echo
38
39 read -r thermalPath
40
41 echo
42 echo Specify path to folder containing Python Script
43 echo \(SingleThreadedFaceDetectionV6\)
44 echo
45
46 read -r opticalPath
47
48 echo
49 echo Specify path to which data should be saved
50 echo for flash drive, use /media/pi/DRIVENAME
51 echo
52
53 read -r mediaPath
54
55 echo
56 read -r -p "remember these settings? [y/n] " remember
57 echo
58
59 #Write settings to launcherSettings.txt
60 case "$remember" in
61 [yY][eE][sS]|[yY])
62 echo Saving to file...
63 echo "remember=y" | sudo tee launcherSettings.txt
64 echo "opticalPath=$opticalPath" | sudo tee -a launcherSettings.txt
65 echo "thermalPath=$thermalPath" | sudo tee -a launcherSettings.txt
66 echo "mediaPath=$mediaPath" | sudo tee -a launcherSettings.txt
67
68 ;;
69 *)
70 echo "remember=n" | sudo tee launcherSettings.txt
71 echo Settings not remembered.
72 ;;
73 esac
74
75 else
76
77 #if settings already exist, ask user whether to keep them. if not, reprompt for new settings
78 echo
79 read -r -p "Keep stored settings? [y/n] " modify
80
81 if [ "$modify" != "y" ];
82 then
83
84 echo
85 echo Please format paths as /folder/.../targetfolder
86 echo
87 echo Specify path to folder containing Thermal Camera Executable
88 echo \(libseek_viewer\)
89 echo
90
91 read -r thermalPath
92
93 echo
94 echo Specify path to folder containing Python Script
95 echo \(SingleThreadedFaceDetectionV6\)
96 echo
97
98 read -r opticalPath
99
100 echo
101 echo Specify path to which data should be saved
102 echo for flash drive, use /media/pi/DRIVENAME
103 echo
104
105 read -r mediaPath
106
107 echo
108 read -r -p "remember these settings? [y/n] " remember
109 echo
110
111 case "$remember" in
112 [yY][eE][sS]|[yY])
113 echo Saving to file...
114 echo "remember=y" | sudo tee launcherSettings.txt
115 echo "opticalPath=$opticalPath" | sudo tee -a launcherSettings.txt
116 echo "thermalPath=$thermalPath" | sudo tee -a launcherSettings.txt
117 echo "mediaPath=$mediaPath" | sudo tee -a launcherSettings.txt
118 ;;
119 *)
120 echo "remember=n" | sudo tee launcherSettings.txt
121 echo Settings not remembered.
122 ;;
123 esac
124
125
126 fi
127 fi
128
129 #initiate thermal camera
130 echo
131 echo Beginning thermal camera...
132 echo
133
134 x-terminal-emulator -e "cd $thermalPath; ./seek_viewer -m[file]"
135
136 #Initiate script for optical camera and analysis. Both this and the thermal camera
137 #program can be ended with CTRL + C
138 echo Beginning Python Script...
139 echo
140 echo Use CTRL + C to end script
141 echo
142
143 python $opticalPath/SingleThreadedFaceDetectionV6.py
144
145 wait
146
147 echo creating file structure...
148
149 sudo mkdir -v -p $mediaPath/trials
150
151 #make numbered trial folder at the smallest unused number
152 echo testing for unused directory name...
153
154 n=0
155 found=0
156
157 while [ $found -eq 0 ];
158 do
159 if test -d "$mediapath/trials/trial$n";
160
161 then
162
163 echo Folder \"trial$n\" is taken.
164
165 ((n+=1))
166
167 else
168
169 echo found free space at folder $n
170 #make subdirectories
171 sudo mkdir -v -p $mediaPath/trials/trial$n/Thermal
172 sudo mkdir -v -p $mediaPath/trials/trial$n/Optical
173 #move photos and trial data to respective directories (may take a while)
174 echo moving thermal photos...
175 sudo mv -i $thermalPath/*.jpeg $mediaPath/trials/trial$n/Thermal
176 sudo mv -i $thermalPath/oldImages/*.jpeg $mediaPath/trials/trial$n/Thermal
177 echo moving optical photos...
178 sudo mv -i $opticalPath/*.jpeg $mediaPath/trials/trial$n/Optical
179 echo moving metadata...
180 sudo mv -i $opticalPath/avgValues.txt $mediaPath/trials/trial$n
181 echo move complete. Rerun launcher.sh to take another trial or eject media to run MATLAB code on PC
182
183 found=1
184
185 fi
186
187 done
188
189 echo Filing data from trial under folder \"$mediapath/trials/trial$n\"
答案1
将此示例片段放入文件中，然后重复运行它。删除较早的目录，下次运行时将重新使用较早的目录。
#!/bin/bash
#
base='trials' # Base directory where everything lives
prefix='trial' # Prefix of subdirectory name
n=0 # Starting suffix number
mkdir -p "$base"
while [ -d "$base/$prefix$n" ]; do ((n++)); done
echo "Will create and use $base/$prefix$n"
mkdir "$base/$prefix$n"
请注意，创建的目录不会按数字升序列出。如果您对目录数量有上限，则可以用前导零填充该数字（例如 0004 而不是 4）。
在您的生产代码中，不要忘记像我在这里所做的那样对变量加双引号。这可以防止 shell 尝试将它们扩展为单独的单词。