Ecrire une commande transpose.sh qui transpose les 
lignes/colonnes d'un  fichier. On utilise le caractère : 
pour delimiter les colonnes du fichier. 


Par exemple :

> for x in {a..h}x{1..8} ; do echo -n  $x: ; done | sed 's/8:/8\n/g' > /tmp/source
> cat /tmp/source

ax1:ax2:ax3:ax4:ax5:ax6:ax7:ax8
bx1:bx2:bx3:bx4:bx5:bx6:bx7:bx8
cx1:cx2:cx3:cx4:cx5:cx6:cx7:cx8
dx1:dx2:dx3:dx4:dx5:dx6:dx7:dx8
ex1:ex2:ex3:ex4:ex5:ex6:ex7:ex8
fx1:fx2:fx3:fx4:fx5:fx6:fx7:fx8
gx1:gx2:gx3:gx4:gx5:gx6:gx7:gx8
hx1:hx2:hx3:hx4:hx5:hx6:hx7:hx8

La transposition du fichier est:

ax1:bx1:cx1:dx1:ex1:fx1:gx1:hx1
ax2:bx2:cx2:dx2:ex2:fx2:gx2:hx2
ax3:bx3:cx3:dx3:ex3:fx3:gx3:hx3
ax4:bx4:cx4:dx4:ex4:fx4:gx4:hx4
ax5:bx5:cx5:dx5:ex5:fx5:gx5:hx5
ax6:bx6:cx6:dx6:ex6:fx6:gx6:hx6
ax7:bx7:cx7:dx7:ex7:fx7:gx7:hx7
ax8:bx8:cx8:dx8:ex8:fx8:gx8:hx8