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Minus of 2 files -- Please help

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Top Forums Shell Programming and Scripting Minus of 2 files -- Please help
# 1  
Old 08-30-2006
MySQL Minus of 2 files -- Please help
Hello people,

awk '{print $0}' input1.txt input2.txt |sort -u
Will give the union of the 2 files. Similarly what is command to get just the diff data (i.e minus) of the 2 files. Can I use the "diff" command to get just the diff data.
Please let me know.

Regards,
Tipsy.
# 2  
Old 08-30-2006
Code:
comm file1 file2

Returns three columns:
Column 1: Lines that appear only in file1,
Column 2: Lines that appear only in file2,
Column 3: Lines that appear in both files.

man comm for more info.
# 3  
Old 08-30-2006
Code:
awk '
      FILENAME=="file1" { arr[$0]++}
      FILENAME=="file2" { if (arr[$0]==0) {print $0} }
      ' file1 file2 > file2minusfile1.txt

will give file2 minus file1, i.e., data in file2 that does not match anything in file1
Last edited by jim mcnamara; 09-01-2006 at 03:53 PM..
This User Gave Thanks to jim mcnamara For This Post:
tinufarid
# 4  
Old 09-01-2006
Hi Jim,
Thanks for your reply. I am getting the following error when I tried the command. Are we missing something in the syntax ?

awk: syntax error near line 2
awk: illegal statement near line 2
awk: syntax error near line 4
awk: bailing out near line 4

Regards,
Tipsy.
# 5  
Old 09-01-2006
Quote:
Originally Posted by tipsy
Hi Jim,
Thanks for your reply. I am getting the following error when I tried the command. Are we missing something in the syntax ?

awk: syntax error near line 2
awk: illegal statement near line 2
awk: syntax error near line 4
awk: bailing out near line 4

Regards,
Tipsy.
I made a change to the source above. my bad - sorry.
# 6  
Old 05-13-2009
Can the code be changed in such a way that file1, file2 and file2minusfile1.txt are variables?
# 7  
Old 05-13-2009
Code:
file1=somefile.txt
file2=anotherfile.txt
resultfile=somefile_minus_anotherfile.txt

awk  -v file1="$file1" -v file2="$file2"
      FILENAME==file1 { arr[$0]++}
      FILENAME==file2 { if (arr[$0]==0) {print $0} }
      ' "$file1" "$file2" > "$resultfile"

This User Gave Thanks to jim mcnamara For This Post:
tinufarid
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