Checks if an object exists in S3
s3_exists(uri)
string, URI of an S3 object, should start with s3://, then bucket name and object key
s3://
boolean
# NOT RUN { s3_exists('s3://botor/example-data/mtcars.csv') s3_exists('s3://botor/example-data/UNDEFINED.CSVLX') # }
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