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Top Forums Shell Programming and Scripting Compare two csv files by two colums and create third file combining data from them. Post 302288032 by rubin on Monday 16th of February 2009 09:34:17 AM
Old 02-16-2009
Code:
NR==FNR {         # while in the first file, 
a[$1 FS $2]=$0    #+load array a indexed by first field, space ( default FS ), second field;  
next              #+then jump to the next record, without testing the following actions for the current record.  }
$1 FS $2 in a {   # Here starts the processing of file2. If field 1, space, and field 2 are found as indexes in array a, 
printf a[$1FS$2]  #+print the whole record ($0) of file 1 saved above in the array a ; 
sub($1 FS $2,"")  # substitute field 1, field 2 ( including the space in between ) with null string ;
print             # print the whole current record ( what's left ) of the second file.  }

 

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usync(8)						      System Manager's Manual							  usync(8)

NAME
usync - synchronize two setld inventory files to reflect current system status SYNOPSIS
/usr/lbin/usync [-d] file1 file2 OPTIONS
Enables debugging. This will print the pairs of pathnames being synchronized on the standard output. DESCRIPTION
The usync command is used to achieve inventory synchronization by merging two inventory files according to the pathname field of the inven- tory records. The result is directed to standard output. If the two inventory files contain records with the same pathname, the record in file2 is written and the record in file1 is ignored. If either inventory file contains a pathname not present in the other file, the record containing that pathname is written to standard output. To reflect the current system inventory, file2 should represent a later installation than file1. RESTRICTIONS
The two inventory files must be sorted in ascending ASCII sequence on the pathname field. ERRORS
usync: file is corrupt Explanation: Records in one of the inventory files are not sorted properly. EXAMPLES
The following command produces a synchronized inventory for two versions of the OATDCB subset: /usr/lbin/usync OATDCB100.inv OATDCB120.inv FILES
Subset inventory files SEE ALSO
stl_inv(4) Programming Support Tools usync(8)
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