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Trying something with openCPU https://www.opencpu.org/api.html
Ozone Solar.R Wind Temp Month Day
41 190 7.4 67 5 1
36 118 8 72 5 2
12 149 12.6 74 5 3
18 313 11.5 62 5 4
NA NA 14.3 56 5 5
28 NA 14.9 66 5 6
23 299 8.6 65 5 7
19 99 13.8 59 5 8
8 19 20.1 61 5 9
NA 194 8.6 69 5 10
7 NA 6.9 74 5 11
16 256 9.7 69 5 12
11 290 9.2 66 5 13
14 274 10.9 68 5 14
18 65 13.2 58 5 15
14 334 11.5 64 5 16
34 307 12 66 5 17
6 78 18.4 57 5 18
30 322 11.5 68 5 19
11 44 9.7 62 5 20
1 8 9.7 59 5 21
11 320 16.6 73 5 22
4 25 9.7 61 5 23
32 92 12 61 5 24
NA 66 16.6 57 5 25
NA 266 14.9 58 5 26
NA NA 8 57 5 27
23 13 12 67 5 28
45 252 14.9 81 5 29
115 223 5.7 79 5 30
37 279 7.4 76 5 31
NA 286 8.6 78 6 1
NA 287 9.7 74 6 2
NA 242 16.1 67 6 3
NA 186 9.2 84 6 4
NA 220 8.6 85 6 5
NA 264 14.3 79 6 6
29 127 9.7 82 6 7
NA 273 6.9 87 6 8
71 291 13.8 90 6 9
39 323 11.5 87 6 10
NA 259 10.9 93 6 11
NA 250 9.2 92 6 12
23 148 8 82 6 13
NA 332 13.8 80 6 14
NA 322 11.5 79 6 15
21 191 14.9 77 6 16
37 284 20.7 72 6 17
20 37 9.2 65 6 18
12 120 11.5 73 6 19
13 137 10.3 76 6 20
NA 150 6.3 77 6 21
NA 59 1.7 76 6 22
NA 91 4.6 76 6 23
NA 250 6.3 76 6 24
NA 135 8 75 6 25
NA 127 8 78 6 26
NA 47 10.3 73 6 27
NA 98 11.5 80 6 28
NA 31 14.9 77 6 29
NA 138 8 83 6 30
135 269 4.1 84 7 1
49 248 9.2 85 7 2
32 236 9.2 81 7 3
NA 101 10.9 84 7 4
64 175 4.6 83 7 5
40 314 10.9 83 7 6
77 276 5.1 88 7 7
97 267 6.3 92 7 8
97 272 5.7 92 7 9
85 175 7.4 89 7 10
NA 139 8.6 82 7 11
10 264 14.3 73 7 12
27 175 14.9 81 7 13
NA 291 14.9 91 7 14
7 48 14.3 80 7 15
48 260 6.9 81 7 16
35 274 10.3 82 7 17
61 285 6.3 84 7 18
79 187 5.1 87 7 19
63 220 11.5 85 7 20
16 7 6.9 74 7 21
NA 258 9.7 81 7 22
NA 295 11.5 82 7 23
80 294 8.6 86 7 24
108 223 8 85 7 25
20 81 8.6 82 7 26
52 82 12 86 7 27
82 213 7.4 88 7 28
50 275 7.4 86 7 29
64 253 7.4 83 7 30
59 254 9.2 81 7 31
39 83 6.9 81 8 1
9 24 13.8 81 8 2
16 77 7.4 82 8 3
78 NA 6.9 86 8 4
35 NA 7.4 85 8 5
66 NA 4.6 87 8 6
122 255 4 89 8 7
89 229 10.3 90 8 8
110 207 8 90 8 9
NA 222 8.6 92 8 10
NA 137 11.5 86 8 11
44 192 11.5 86 8 12
28 273 11.5 82 8 13
65 157 9.7 80 8 14
NA 64 11.5 79 8 15
22 71 10.3 77 8 16
59 51 6.3 79 8 17
23 115 7.4 76 8 18
31 244 10.9 78 8 19
44 190 10.3 78 8 20
21 259 15.5 77 8 21
9 36 14.3 72 8 22
NA 255 12.6 75 8 23
45 212 9.7 79 8 24
168 238 3.4 81 8 25
73 215 8 86 8 26
NA 153 5.7 88 8 27
76 203 9.7 97 8 28
118 225 2.3 94 8 29
84 237 6.3 96 8 30
85 188 6.3 94 8 31
96 167 6.9 91 9 1
78 197 5.1 92 9 2
73 183 2.8 93 9 3
91 189 4.6 93 9 4
47 95 7.4 87 9 5
32 92 15.5 84 9 6
20 252 10.9 80 9 7
23 220 10.3 78 9 8
21 230 10.9 75 9 9
24 259 9.7 73 9 10
44 236 14.9 81 9 11
21 259 15.5 76 9 12
28 238 6.3 77 9 13
9 24 10.9 71 9 14
13 112 11.5 71 9 15
46 237 6.9 78 9 16
18 224 13.8 67 9 17
13 27 10.3 76 9 18
24 238 10.3 68 9 19
16 201 8 82 9 20
13 238 12.6 64 9 21
23 14 9.2 71 9 22
36 139 10.3 81 9 23
7 49 10.3 69 9 24
14 20 16.6 63 9 25
30 193 6.9 70 9 26
NA 145 13.2 77 9 27
14 191 14.3 75 9 28
18 131 8 76 9 29
20 223 11.5 68 9 30
#!/usr/bin/env bash
# use as path_to_bash_script/csv_head_opencpu full_path_to_file
read_csv_session=$(curl https://public.opencpu.org/ocpu/library/utils/R/read.csv -F "file=@$1" | head -n1 | cut -f 4 -d "/")
head_data_session=$(curl https://public.opencpu.org/ocpu/library/utils/R/head -d "x=$read_csv_session" | head -n1 | cut -f 4 -d "/")
curl https://public.opencpu.org/ocpu/tmp/$head_data_session/R/.val/print

First, read.csv

the file by posting the file:

curl https://public.opencpu.org/ocpu/library/utils/R/read.csv -F "file=@airquality.csv"

which outputs:

/ocpu/tmp/x0667b22ae7/R/.val
/ocpu/tmp/x0667b22ae7/stdout
/ocpu/tmp/x0667b22ae7/source
/ocpu/tmp/x0667b22ae7/console
/ocpu/tmp/x0667b22ae7/info
/ocpu/tmp/x0667b22ae7/files/airquality.csv
/ocpu/tmp/x0667b22ae7/files/DESCRIPTION

where x0667b22ae7 becomes the session id for our next call.

Then, call head with named parameter x

set to the session id:

curl https://public.opencpu.org/ocpu/library/utils/R/head -d "x=x0667b22ae7"

which outputs:

/ocpu/tmp/x07505e8fc7/R/.val
/ocpu/tmp/x07505e8fc7/stdout
/ocpu/tmp/x07505e8fc7/source
/ocpu/tmp/x07505e8fc7/console
/ocpu/tmp/x07505e8fc7/info
/ocpu/tmp/x07505e8fc7/files/DESCRIPTION

Finally, print the result

of this last session:

curl https://public.opencpu.org/ocpu/tmp/x07505e8fc7/R/.val/print

which outputs:

  Ozone Solar.R Wind Temp Month Day
1    41     190  7.4   67     5   1
2    36     118  8.0   72     5   2
3    12     149 12.6   74     5   3
4    18     313 11.5   62     5   4
5    NA      NA 14.3   56     5   5
6    28      NA 14.9   66     5   6

As a quick script

read_csv_session=$(curl https://public.opencpu.org/ocpu/library/utils/R/read.csv -F "file=@airquality.csv" | head -n1 | cut -f 4 -d "/")

head_data_session=$(curl https://public.opencpu.org/ocpu/library/utils/R/head -d "x=$read_csv_session" | head -n1 | cut -f 4 -d "/")

curl https://public.opencpu.org/ocpu/tmp/$head_data_session/R/.val/print

About

The general pattern is we can call functions at the various endpoints by POSTing named paramaters.

To get what the parameter names should be, we can do do a curl like this:

curl https://public.opencpu.org/ocpu/library/utils/R/head/print

or, we can go to https://public.opencpu.org/ocpu/library/utils/R/head in your browser to see. If we go to https://public.opencpu.org/ocpu/library/utils/R/, we can see all available functions to call with the utils route. We can see base R functions at https://public.opencpu.org/ocpu/library/base/R/.

The same goes for the base path of any library, such as going to https://public.opencpu.org/ocpu/library/ggplot2/R/, or https://public.opencpu.org/ocpu/library/ggplot2/info/ for the info/help.

See the docs for openCPU here for more about the endpoints.

There are also some cool ways to use the JavaScript library which conveniently wraps making calls to the ocpu endpoints in JavaScript functions.

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