!if type seq >/dev/null 2>&1; then seq 999; else jot 999; fi > input
text
get -L0 input output
!wc -l < output
# *999
!diff -u input output
get -L1 input output
!wc -l < output
# *998
get -L10 input output
!wc -l < output
# *989
get -L100 input output
!wc -l < output
# *899
get -L1000 input output
#.*end of file.*
get -L999 input output
!wc -l < output
# *0
