piping to "cut" and "sort", does the job as i wanted - thanks (just
didn't know about the unique-switch in sort. Great!
| cut -d "|" -f3 | sort -u"
Marco
Nikos Alexandris schrieb:
On Fri, 2008-03-07 at 11:37 +0100, Marco Lechner wrote:
hi list,
how can i get a list of all different occurences in a column of an
attributetable.
Marco,
in a linux-box another way would be to combine db.select with the "sort"
command.
Example (commands in quotes):
I have a table TrainingSamples which looks like:
"v.info -c TrainingSamples"
Displaying column types/names for database connection of layer 1:
INTEGER|cat
INTEGER|clccode_le
TEXT|label
"db.selct TrainingSamples"
1|3|vegetation
2|334|Burned
3|334|Burned
[...]
45|332|non_veg
46|2|agro
And I want to get only the number of different labels (in column
"label")
"db.select TrainingSamples | cut -d "|" -f3 | sort -u"
agro
Burned
label
minext
non_veg
non_vegetation
urban
vegetation
water
---
* cut -d "|" splits an output line in more fields separated by the "|"
character
* -f3 (belongs to the cut command as well) and prints only the 3rd field
* sort -u does the actual job. It prints only once a name/ number no
matter how many times it appears.
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