awk - Removing lines with the first and the last occurence of a column value -


i have following file

    id      score    other     abr     0.98     nbnmsb     bcg     0.76     nbnmsb     cvd     0.6      nbnmsb     bcg     0.9      vscva     cvd     0.56     vscva     abr     0.9      vscva     cvd     0.7      bavsc     bcg     0.4      bavsc     abr     0.5      bavsc     aac     0.1      bavsc     abr     0.8      nbnmsb     bcg     0.6      nbnmsb     cvd     0.3      nbnmsb     bcg     0.7      vscva     cvd     0.0      vscva     abr     0.1      vscva     cvd     0.5      bavsc     bcg     0.8      bavsc     abr     1.0      bavsc

and want exclude first , last occurrence of value in column 3 such output as:

id      score    other bcg     0.76     nbnmsb cvd     0.56     vscva bcg     0.4      bavsc abr     0.5      bavsc bcg     0.6      nbnmsb cvd     0.0      vscva bcg     0.8      bavsc

if have tac (or gtac) can remove first instances, reverse file, remove first (really last) instances , flip file 1 last time.

$ awk '$3==p;{p=$3}' file1 | tac | awk '$3==p;{p=$3}' | tac bcg     0.76     nbnmsb cvd     0.56     vscva bcg     0.4      bavsc abr     0.5      bavsc bcg     0.6      nbnmsb cvd     0.0      vscva bcg     0.8      bavsc

edit:

here more flexible version. set initial value of c desired column:

use column 3:

 c=3 && awk -v c=$c '$c==p;{p=$c}' file1 | tac | awk -v c=$c '$c==p;{p=$c}' | tac

use column 4:

 c=4 && awk -v c=$c '$c==p;{p=$c}' file1 | tac | awk -v c=$c '$c==p;{p=$c}' | tac

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