16

i have 4 files which are like

       file A
       >TCONS_00000867
       >TCONS_00001442
       >TCONS_00001447
       >TCONS_00001528
       >TCONS_00001529
       >TCONS_00001668
       >TCONS_00001921

       file b
       >TCONS_00001528
       >TCONS_00001529
       >TCONS_00001668
       >TCONS_00001921
       >TCONS_00001922
       >TCONS_00001924

       file c
       >TCONS_00001529
       >TCONS_00001668
       >TCONS_00001921
       >TCONS_00001922
       >TCONS_00001924
       >TCONS_00001956
       >TCONS_00002048

       file d
       >TCONS_00001922
       >TCONS_00001924
       >TCONS_00001956
       >TCONS_00002048

all files contain more than 2000 lines and sorted for first column.

i want to find common lines in all files. i tried awk and grep and comm but not working

21

Since the files are already sorted:

comm -12 a b |
  comm -12 - c |
  comm -12 - d
-1
cat a b c d |sort |uniq -c |sed -n -e 's/^ *4 \(.*\)/\1/p'

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