faq.md
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## BioGrids FAQ
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-## How do I confirm the version of R I am using?
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+## R version confirmation
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+---
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+From the command line, check your path:
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+
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+```
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+$ R --sbwhich
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+
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+or
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+
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+$ which R
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+```
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+
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+Use the biogrids-info utility:
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+
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+```
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+$ biogrids-info -l r
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+ Version information for: /programs/i386-mac/r
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+
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+Default version: 3.3.2
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+In-use version: 3.6.2
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+
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+Installed versions: 3.6.2
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+Other available versions: 3.6.2 3.5.1 3.4.2 3.2.1 3.2.2 3.0.3 2.13.0 2.11.1
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+Overrides use this shell variable: R_M
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+```
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+
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+Check the version override variable:
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+
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+```
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+$ echo $R_M
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+3.6.2
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+
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+```
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Within your R code:
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```
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> system("type R")
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R is /programs/x86_64-linux/r/3.6.2/bin/R
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-> library(ggplot2)
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-> packageVersion("ggplot2")
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-[1] '3.2.1'
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```
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