UNIX for Beginners Questions & Answers

#!/usr/bin/ksh
File1=$1
awk 'NR%3==1{x=sprintf("%03d_%s",++i,FILENAME)}{print > x}' $1

#!/usr/bin/ksh
awk 'NR%3==1{x=sprintf("%03d_%s",++i,FILENAME)}{print > x}' "$1"

#!/usr/bin/ksh
File1=$1
awk 'NR%3==1{x=sprintf("%03d_%s",++i,FILENAME)}{print > x}' "$File1"

#!/usr/bin/ksh
ChunkSize=$1
shift 1
awk -v s="$ChunkSize" 'FNR==1{i=0}FNR%s==1{close(x);x=sprintf("%03d_%s",++i,FILENAME)}{print > x}' "$@"

#!/usr/bin/ksh
# Usage: utlity_name Chunk_Size Filename...
# where:	Chunk_Size is the number of lines to write in each output file.
#
#		Filename is the filename (not pathname) of a file to be split
#		into files each of which contains no more than Chunk_Size lines
#		with a name that is a leading zero-filled 3 digit decimal
#		sequence number of the file being split followed by an
#		underscore follwed by Filename.

# Get the chunk size from the 1st operand.
ChunkSize=$1

# Discard the 1st command-line operand leaving just the filenames as the
# remaining operands.
shift 1

# Invoke awk to process the Filename operands given on the command line:
awk -v s="$ChunkSize" '				# Set s to the chunk size.
FNR == 1 {					# When we find the 1st line in
						# an input file...
	i = 0					#   reset the output file
						#   counter for this input file.
}
FNR%s == 1 {					# When we find the 1st input
						# line in a chunk size set of
						# lines in an input file...
	close(fn)				#   close the previous output
						#   file (if there was one)
						#   and...
	fn = sprintf("%03d_%s", ++i ,FILENAME)	#   set the output filename for
						#   the next output file.
}
{						# For every line read from an
						# input file...
	print > fn				#   write the input line into
						#   the current output file.
}' "$@"						# Mark end of awk script and
						# pass in the remaining
						# command-line arguments as the
						# names of the files to be
						# split.