awk '{ for(i=65; i<=90; i++) { arr[i]=i } }END{ for ( i in arr ) { printf "%d %c\n", i, arr[i] } }' /bin/ls


output of this is::::
70 F
71 G
72 H
73 I
74 J
75 K
76 L
77 M
78 N
79 O
90 Z
65 A
66 B
67 C
68 D
69 E
80 P
81 Q
82 R
83 S
84 T
85 U
86 V
87 W
88 X
89 Y


Why it is not giving in proper way. can I get A to Z serially.