tag 29396 notabug
close 29396
thanks
(based on reproducible example provided privately)
Hello,
On 2017-11-22 09:48 AM, Assaf Gordon wrote:
On 2017-11-22 07:15 AM, Saint Michael wrote:
I have two files with phone numbers, one column, sorted (they pass the
test
sort -c). One is large and the other one is small. The comm -12
--check-order file1.csv file2.csv falis to find matches, but another
utility, join file1.csv file2.csv. does find a lot of matches.
This is not a bug in comm, but simply incorrect usage.
The file "file2.csv" (provided privately) contained a space character
after each number.
"comm" compares entire lines, and spaces do matter.
"join" compares fields, and trailing spaces field do not matter.
A simple reproducer:
$ seq 5 > a
$ echo "4 " > b
$ join a b
4
$ comm -12 a b
[ ... no output ... ]
To remove the trailing spaces on the file, try:
$ sed 's/ *$//' file2.csv > file2-no-space.csv
$ comm -12 file1.csv file2-no-space.csv | wc -l
864
$ join file1.csv file2.csv | wc -l
864
regards,
- assaf
