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Full Discussion: Left join on files using awk
Top Forums Shell Programming and Scripting Left join on files using awk Post 302320369 by ghostdog74 on Wednesday 27th of May 2009 08:04:53 PM
Old 05-27-2009
if you have Python, an alternative
Code:
#!/usr/bin/env python
file2=[i.split()[0] for i in open("file2").read().split("\n")]
for line in open("file1"):
    line=line.strip().split()
    if line[0] in file2:
        print line[0]," found"
    else:
        print line[0],","

output
Code:
# ./test.py
NY  found
NJ  found
PA ,
CA  found
VA  found
TN ,

 

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LEARN ABOUT MINIX

paste

PASTE(1)						      General Commands Manual							  PASTE(1)

NAME

       paste - paste multiple files together

SYNOPSIS

       paste [-s] [-d list] file...

OPTIONS

       -d     Set delimiter used to separate columns to list.

       -s     Print files sequentially, file k on line k.

EXAMPLES

       paste file1 file2   # Print file1 in col 1, file2 in col 2

       paste -s f1 f2	   # Print f1 on line 1 and f2 on line 2

       paste -d : file1 file2
			   # Print the lines separated by a colon

DESCRIPTION

       Paste  concatenates  corresponding  lines of the given input files and writes them to standard output. The lines of the different files are
       separated by the delimiters given with the option -s. If no list is given, a tab is substituted for every linefeed, except  the	last  one.
       If  end-of-file	is hit on an input file, subsequent lines are empty.  Suppose a set of k files each has one word per line.  Then the paste
       output will have k columns, with the contents of file j in column j.  If the -s flag is given, then the first file is on line 1, the second
       file on line 2, etc.  In effect, -s turns the output sideways.

       If  a list of delimiters is given, they are used in turn.  The C escape sequences 
, 	, \, and  are used for linefeed, tab, backslash,
       and the null string, respectively.

																	  PASTE(1)
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