问题
I have function, that works with json string. When I try in R:
my_function('{"menu":{"id":"file","value":"File","popup":{"menuitem":[{"value":"New","onclick":"CreateNewDoc()"},{"value":"Open","onclick":"OpenDoc()"},{"value":"Close","onclick":"CloseDoc()"}]}}}')
it works well.
But when I try in Shell command:
R -e "source('./my_function.R'); my_function('{"menu":{"id":"file","value":"File","popup":{"menuitem":[{"value":"New","onclick":"CreateNewDoc()"},{"value":"Open","onclick":"OpenDoc()"},{"value":"Close","onclick":"CloseDoc()"}]}}}')"
It fails with error:
unexpected character 'm'
.
Seems, that problem is with quotes in json string. How can I solve it?
P.S. I need to call my_function directly from Shell.
Thank you!
回答1:
Write it main script like main.r,
source('./my_function.R')
my_function('{"menu":{"id":"file","value":"File","popup":{"menuitem":[{"value":"New","onclick":"CreateNewDoc()"},{"value":"Open","onclick":"OpenDoc()"},{"value":"Close","onclick":"CloseDoc()"}]}}}')"
Execute it from command terminal like,
Rscript main.r
please make sure you have R path configured.
回答2:
You can't mix the quotes as you are doing. The shell is reading from your opening double quotes until the first double quotes it finds ( which is in your JSON string). It then sees an m (in menu) which it can't handle and gives the error message.
来源：https://stackoverflow.com/questions/22221113/run-from-shell-r-function-with-json-string-parameter