Working with the Unix OS

Unix Tools
Brown eqn 1 # output
Jones spell 5
Smith draw 9
{ if ($1 != prev)
{
print $1 ":"
prev = $1
}
print" "$2" "$3
}
Brown:
# output
eqn 1
Jones:
spell 5
Smith:
draw 9
! Cooperation with the Shell
To get field n into the awk program:
awk '{ print $’$1’}'
awk "( print \$ $1 )"
! Multidimensional Arrays
for (i = 1; i