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Full Discussion: Merging two files based on matching columns
Top Forums UNIX for Dummies Questions & Answers Merging two files based on matching columns Post 302948100 by Don Cragun on Thursday 25th of June 2015 04:12:24 PM
Old 06-25-2015
Reformatting Scrutinizer's first script and adding comments:
Code:
awk '				# Invoke awk with this script...
NR == FNR {			# If the number of lines read from all files
				# (NR) is equal to the number of lines read
				# from the current input file (FNR) (which in
				# this case means if we are looking at a line
				# from file2)...
	A[$2] = $1		# Create an array (A[]) indexed by field 2 ($2)
				# on the current line whose value is set to
				# field 1 ($1) on the current line.
	B[$2] = $3		# Create an array (B[]) indexed by field 2 ($2)
				# on the current line whose value is set to
				# field 3 ($3) on the current line.
	next			# Skip to next input line and restart
				# processing at the top of htis script.
}
{				# If we got to here, we are looking at a line
				# from file1...
	$3 = A[$1]		# Set field 3 on this line to what was saved in
				# array A[] indexed by the contents of field 1
				# on this line (A[$1]).
	$4 = B[$1]		# Set field 4 on this line to what was saved in
				# array B[] indexed by the contents of field 1
				# on this line (B[$1]).
}
1				# Perform the default action (print the current
				# contents of the current line).
' FS=, OFS=, file2 file1	# End the script ('), set the input field
				# separator to a comma (FS=,), set the output
				# field separator to a comma (OFS=,) and name
				# the two files to be processed by this awk
				# script (file2 file1).

Hopefully, the above description will enable you to determine how the 2nd script does the same thing using one array instead of two. If you are still confused, tell us what still doesn't make sense and we'll try to explain it a different way.
These 3 Users Gave Thanks to Don Cragun For This Post:
Prathmesh rbatte1 Scrutinizer
 

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po2txt

po2txt(1)						      Translate Toolkit 1.9.0							 po2txt(1)

NAME

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DESCRIPTION

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	      show progress as: dots, none, bar, names, verbose

       --errorlevel
	      show errorlevel as: none, message, exception, traceback

       -i/--input
	      read from INPUT in xlf, po, pot formats

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	      exclude names matching EXCLUDE from input paths

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							      Translate Toolkit 1.9.0							 po2txt(1)
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