How to avoid showing headers in STOUT of R data.table?

Question

I am trying to avoid showing headers in R\'s STOUT of data.table output. Akrun says in the related thread the the null route may be possible with print

Answer 1

We can use the unname

unname(DF[time <8])[]

# 1: Acute 0.0  0 A 6 0.000000
# 2:    An 7.7 26 B 6 1.283333
# 3:    Fo 0.0  0 B 5 0.000000
# 4: Acute 7.5  1 C 6 1.250000
# 5:    An 7.9 43 C 6 1.316667
# 6:    En 0.0  0 C 6 0.000000
# 7:    Fo 5.4  1 C 5 1.080000
# 8:    An 7.8 77 D 6 1.300000
# 9:    En 0.0  0 D 6 0.000000
#10:    Fo 0.0  0 D 5 0.000000
#11: Acute 0.0  0 E 6 0.000000
#12:    An 7.9 60 E 6 1.316667
#13:    Fo 0.0  0 E 5 0.000000
#14:    Fo 7.9  3 F 5 1.580000

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One option to avoid the empty line would be

cat(trimws(capture.output(unname(DF[time <8]))[-1]) , sep="\n")
#1: Acute 0.0  0 A 6 0.000000
#2:    An 7.7 26 B 6 1.283333
#3:    Fo 0.0  0 B 5 0.000000
#4: Acute 7.5  1 C 6 1.250000
#5:    An 7.9 43 C 6 1.316667
#6:    En 0.0  0 C 6 0.000000
#7:    Fo 5.4  1 C 5 1.080000
#8:    An 7.8 77 D 6 1.300000
#9:    En 0.0  0 D 6 0.000000
#10:    Fo 0.0  0 D 5 0.000000
#11: Acute 0.0  0 E 6 0.000000
#12:    An 7.9 60 E 6 1.316667
#13:    Fo 0.0  0 E 5 0.000000
#14:    Fo 7.9  3 F 5 1.580000

For better formatting, the trimws could be avoided

cat(capture.output(unname(DF[time <8]))[-1] , sep="\n")
# 1: Acute 0.0  0 A 6 0.000000
# 2:    An 7.7 26 B 6 1.283333
# 3:    Fo 0.0  0 B 5 0.000000
# 4: Acute 7.5  1 C 6 1.250000
# 5:    An 7.9 43 C 6 1.316667
# 6:    En 0.0  0 C 6 0.000000
# 7:    Fo 5.4  1 C 5 1.080000
# 8:    An 7.8 77 D 6 1.300000
# 9:    En 0.0  0 D 6 0.000000
#10:    Fo 0.0  0 D 5 0.000000
#11: Acute 0.0  0 E 6 0.000000
#12:    An 7.9 60 E 6 1.316667
#13:    Fo 0.0  0 E 5 0.000000
#14:    Fo 7.9  3 F 5 1.580000