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Full Discussion: Join 2 files based on certain column
Top Forums UNIX for Dummies Questions & Answers Join 2 files based on certain column Post 302916138 by Don Cragun on Sunday 7th of September 2014 02:36:55 PM
Old 09-07-2014
Reformattig Franklin52's code and adding comments:
Code:
awk -F\| '		# Set input field separator to "|".
fNR==FNR{		# For all lines in the 1st file given...
	i=$1		# Set i to the contents of the 1st field.
	sub($1,x)	# Substitute the 1st occurrence in the current line of
			# the contents of the 1st field with the contents of the
			# variable x.  Since x has not been set, the replaceent
			# string is an empty string.  This is dangerous if the
			# contents of the first field could contain any ERE
			# special characters.  I would have written this as:
			#	$1=""
			# or:	$1=x
	a[i]=$0		# Set a[i] to the contents of the modified current line
	next		# Skip remaining steps for this input line; start next
			# cycle.
}
$1 in a{print $0 a[$1]	# For all lines in the second file that have a 1st field
			# that matches the original first field in the 1st file,
			# print the current input line with the contents of the
			# corresponding line (except the 1st field) from the 1st
			# file added to the end of the line.
}' input2.txt input1.txt # Specify names of files to be processed.

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LEARN ABOUT DEBIAN

keyhead

keyhead(1)						      General Commands Manual							keyhead(1)

Name
       keyhead - Change FITS or IRAF header keyword names

Synopsis
       keyhead [-hknv] <FITS or IRAF file> kw1=kw1a kw2=kwd2a ... kwn=kwdna

Description
       Change the names of keywords in FITS or IRAF image headers.  Each current image keyword whose entry is to be modified should be followed by
       an equal sign and a second keyword, with no intervening spaces.	If the -r option is used, the value of the second keyword is transfered to
       that  of the first. Otherwise, the name of the first keyword is changed to the second keyword.  To change keywords in a list of files, sub-
       stitute @<listfile> for the file names on the command line.  To change a lot of keywords, put them, one pair separated by an = sign with no
       spaces  per  line, in a file and substitute @<keylistfile> on the command line.	If two @ commands are present, the program will figure out
       which contains file names and which contains keywords.  Lines in a keyword list file which do not contain an = are ignored.

Options
       -h     Write HISTORY line into output header with sethead version, current date and time, and names of keywords set.

       -k     Write KEYHEAD keyword into output header with the keyhead version, current date and time, and names  of  keywords  whose	names  are
	      changed.	If a KEYHEAD keyword already exists, move the old value to a HISTORY line before writing the new value

       -n     Write a new file with an added "e" before the extension.

       -r letter
	      Replace  value of 1st keyword with value of 2nd keyword instead of changing the name of the 1st keyword to the 2nd keyword.  The 2nd
	      keyword remains in the header.  If the 1st keyword does not exist in the header, it is created.

       -v     Print confirmations of each keyword change.

Web Page
       http://tdc-www.harvard.edu/software/wcstools/keyhead.html

Author
       Doug Mink, SAO (dmink@cfa.harvard.edu)

6 July 2001							     WCSTools								keyhead(1)
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