Not the same phone encoding challenge, but an interesting feature of the bsd globbing built into bash. The map is the typical map of letters on a touch-tone ph

Not the same phone encoding challenge, but an interesting feature of the bsd globbing built into bash. The map is the typical map of letters on a touch-tone phone..where "2" can be a, b, or c. All letter combos for the number "6397": #!/usr/bin/bash m[0]=0;m[1]=1;m[2]="{a,b,c}";m[3]="{d,e,f}";m[4]="{g,h,i}";m[5]="{j,k,l}"; m[6]="{m,n,o}";m[7]="{p,q,r,s}";m[8]="{t,u,v}";m[9]="{w,x,y,z}" var=$(echo ${m[6]}${m[3]}${m[9]}${m[7]}) eval echo $var