Hi, I hope you understand my English, I have some problem with the "b"
option of sort (Slackware 12.2, kernel 2.6.27.7-smp, Coreutils 6.12).
From the "-k" section of the doc:
a character position of zero in pos2 indicates the field's last
character. If ‘.c’ is omitted from pos1, it defaults to 1 (the beginning
of the field); if omitted from pos2, it defaults to 0 (the end of the
field).
reading this I'd expect #1 and #2 to have the same effect, since I
didn't read about any special cases.
From the examples section:
The inheritance works in this case because -k 5b,5b and -k 5b,5 are
equivalent, as the location of a field-end lacking a ‘.c’ character
position is not affected by whether initial blanks are skipped.
But #1 and #3 also differ:
$ sort -k 1b,1b #1
a x
a y
a z
^D
a z
a y
a x
$ sort -k 1b,1.0b #2
a x
a y
a z
^D
a x
a y
a z
$ sort -k 1b,1 #3
a x
a y
a z
^D
a x
a y
a z
$ sort -uk 1b,1b #1u
a x
a y
a z
^D
a z
a y
a x
$ sort -uk 1b,1.0b #2u
a x
a y
a z
^D
a x
$ sort -uk 1b,1 #3u
a x
a y
a z
^D
a x
--
Thanks
DC
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