get line number with bash in R -

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using 

system(paste("wc -l file_1.txt"))

in r obtain line number of file output

1601 file_1.txt

my problem if type system(paste("wc -l file_1.txt"))->kt , 

kt [1] 0

i need able whether 

system(paste("wc -l file_1.txt"))->kt kt[1]==1600

or not..but cant access elements system commadn or printout...how can somehow check whether file has 1600 lines without reading r first...

system returns return value of command default, need use intern argument:

system(paste("wc -l banner.p"), intern=t)->kt

kt string like

<lines> <filename>

and parse string.


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