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Finding records NOT on another file

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# 1  
Old 11-02-2018
Finding records NOT on another file
I have three files named ALL, MATCH, and DIFF. Match and diff have completely different records included in the "all" file, but the "all" file also has records not in either the Match or Diff files.

I know I can sort all three files together, one unique and one without that option to show which ones appear in two files by running diff, but how can I find the records that are only in the "all" file?

TIA
# 2  
Old 11-02-2018
If ALL is small enough to fit in memory:
Code:
awk 'NR==FNR { A[$0] ; next } ; $0 in A { delete A[$0] } END { for(X in A) { print X }' ALL MATCH DIFF

This User Gave Thanks to Corona688 For This Post:
gull04
# 3  
Old 11-03-2018
Try also

Code:
sort ALL MATCH DIFF | uniq -c | grep "^ *1"

# 4  
Old 11-06-2018
Sorted (untested):
Code:
comm -23 <(sort ALL) <(sort MATCH DIFF)

Unsorted (untested):
Code:
fgrep -f <(comm -23 <(sort ALL) <(sort MATCH DIFF) ALL)

You may wish to use the -u switch to sort to remove duplicate lines.

Andrew
# 5  
Old 11-06-2018
One could also try:
Code:
awk 'FNR == 1 { fc++ } fc < 3 {d[$0]; next } !($0 in d)' DIFF MATCH ALL

which has been tested.

This requires enough space for the unique records in DIFF and MATCH to be held in memory, but doesn't require space in memory for the unique records in ALL.
# 6  
Old 11-06-2018
The following variant works with any number of "exclude"-files
Code:
awk 'BEGIN {nfiles=ARGC-1} FNR == 1 { fc++ } fc < nfiles {d[$0]; next } !($0 in d)' DIFF MATCH ALL

Another idea: make the last filename special
Code:
awk 'FILENAME!="-" { d[$0]; next } !($0 in d)' MATCH DIFF - < ALL

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