我尝试了以下命令(适用于 powershell 窗口)
system('powershell -command \"Get-ChildItem -Filter "*.html" | Where-Object { $_.LastWriteTime -ge "11/12/2021 09:10:00" }\"')
但是，从 R 控制台我得到了错误:
At line:1 char:79
+ ... er *.html | Where-Object { $_.LastWriteTime -ge 11/12/2021 09:10:00 }
+ ~~~~~~~~
Unexpected token '09:10:00' in expression or statement.
+ CategoryInfo : ParserError: (:) [], ParentContainsErrorRecordException
+ FullyQualifiedErrorId : UnexpectedToken
[1] 1
编辑
使用 Mikael Jagan 的想法，我设法得到了一个结果:
system(paste('powershell -command ',shQuote('Get-ChildItem -Filter "*.html" | Where-Object { $_.LastWriteTime -ge "11/30/2021 09:10:00" }')))
但是，如下所示，结果是一个字符向量，而不是一个数据帧。有没有办法只获取带有文件名的向量？
[1] ""
[2] ""
[3] " Directory: C:\\Users\\user\\Documents\\R_Data\\texk"
[4] ""
[5] ""
[6] "Mode LastWriteTime Length Name "
[7] "---- ------------- ------ ---- "
[8] "-a---- 30/11/2021 10:31 386751 auth_cash_flow.html "
[9] "-a---- 30/11/2021 10:31 189370 auth_cash_flow_total.html "
[10] "-a---- 30/11/2021 10:31 552947 auth_symv_gantt.html "
[11] "-a---- 30/11/2021 10:31 93238 auth_tender_schedule.html "
[12] "-a---- 30/11/2021 10:30 683088 dev_constr_pivot.html "
[13] "-a---- 30/11/2021 10:30 70224 form_org_chart.html "
[14] "-a---- 30/11/2021 10:31 199907 form_org_chart2.html "
[15] "-a---- 30/11/2021 10:30 618821 form_workload.html "
[16] "-a---- 30/11/2021 10:30 109127 index.html "
[17] ""
[18] ""
这是我的 session 信息:
> sessionInfo()
R version 4.0.5 (2021-03-31)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19043)
Matrix products: default
locale:
[1] LC_COLLATE=Greek_Greece.1253 LC_CTYPE=Greek_Greece.1253 LC_MONETARY=Greek_Greece.1253
[4] LC_NUMERIC=C LC_TIME=Greek_Greece.1253
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_4.0.5 tools_4.0.5
最佳答案
x <- system(paste('powershell -command ',shQuote('Get-ChildItem -Filter "*.html" | Where-Object { $_.LastWriteTime -ge "11/30/2021 09:10:00" } | Select -exp Name')), intern = TRUE)
关于从 R : Unexpected token in expression or statement 运行 powershell 命令，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/70165832/