$ echo "00000*HEADER
026531200621068000000010000000201605319353219
026544400621066000000020000000201605319353220
026544400621066000000020000000201605319353221
028544400621066000000020000000201605319353222
026544400621066000000020000000201605319353223
026531205321068000000070000000201605319353225
026531205321061000000020000000201605319353227
035531205321061000000060000000201605319353228
026531205321061000000100000000201605319353229
026531206160553000370730000000201605319536198
026531208560553000332070000000201605319536199
026531208380553000252460000000201605319536200
026531206160542000538890000000201605319536201
026531209180553000223440000000201605319536202
026531206080553000135900000000201605319536203
026531209590553000192650000000201605319536204
026531208360553000578390000000201605319536205
001531208360553001347360000000201605319536206
026531206590553000216510000000201605319536207
99999*TRAILLER000000020" | sed '1d;$d' | cut -c -3 | sort | uniq -c
1 001
16 026
1 028
1 035