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Top Forums UNIX for Beginners Questions & Answers Extract delta records using with "comm" and "sort" commands combination Post 303002040 by njny on Wednesday 16th of August 2017 02:43:12 PM
Old 08-16-2017
Extract delta records using with "comm" and "sort" commands combination

Hi All,
I have 2 pipe delimited files viz., file_old and file_new. I'm trying to compare these 2 files, and extract all the different rows between them into a new_file.

Code:
comm -3 < sort file_old < sort file_new > new_file

I am getting the below error:
Code:
-ksh: sort: cannot open [No such file or directory]

But if I do as below, it is successfully giving me the difference.
Code:
sort file_old > file1
sort file_new > file2
comm -3 file1 file2 > file3

Can you please help me understand why the first approach resulting in an error?

Thank you.

PS: I did search the forum before posting this thread but no luck


Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!

Last edited by RudiC; 08-16-2017 at 03:52 PM.. Reason: Added CODE tags.
 

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SORT(1) 						      General Commands Manual							   SORT(1)

NAME
sort - sort a file of ASCII lines SYNOPSIS
sort [-bcdfimnru] [-tc] [-o name] [+pos1] [-pos2] file ... OPTIONS
-b Skip leading blanks when making comparisons -c Check to see if a file is sorted -d Dictionary order: ignore punctuation -f Fold upper case onto lower case -i Ignore nonASCII characters -m Merge presorted files -n Numeric sort order -o Next argument is output file -r Reverse the sort order -t Following character is field separator -u Unique mode (delete duplicate lines) EXAMPLES
sort -nr file # Sort keys numerically, reversed sort +2 -4 file # Sort using fields 2 and 3 as key sort +2 -t: -o out # Field separator is : sort +.3 -.6 # Characters 3 through 5 form the key DESCRIPTION
Sort sorts one or more files. If no files are specified, stdin is sorted. Output is written on standard output, unless -o is specified. The options +pos1 -pos2 use only fields pos1 up to but not including pos2 as the sort key, where a field is a string of characters delim- ited by spaces and tabs, unless a different field delimiter is specified with -t. Both pos1 and pos2 have the form m.n where m tells the number of fields and n tells the number of characters. Either m or n may be omitted. SEE ALSO
comm(1), grep(1), uniq(1). SORT(1)
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