Shell Programming and Scripting

for x in `cat tmp2.txt`; do
       if[ "BAC" == _____  ]; then
               echo 'BAC'
       elif[ "sdf_ada" == _____]
         etcetc
       fi
done

for x in `cat tmp2.txt`; do     #get line per line
       if[ "BAC" == _____  ]; then        
               echo 'BAC'
       elif[ "sdf_ada" == _____]
         etcetc
       elif[ ... ] 
       fi (18x)
done

if[ "BAC" == substr($1,1,3)  ]; then        
               echo 'BAC'
elif[ "sdf_ada" ==  substr($1,1,7) ]
               echo 'sdf_ada'
elif[ "UI10" == substr($1,1,4) ]
..... (18x)

BAC0904102604 -> BAC
AFR0904102604 -> AFR
HHF0904102604 -> HHF
UI100904102907 ->UI10
sdf_ada_9541-9543.1 -> sdf_ada
_fsf13145533 -> fsf

BAC0904102604foo
AFR0904102604bar fred
sdf_ada_9541-9543.1foo
HHF0904102604function
UI100904102907brick
sdf_ada_9541-9543.1red
_fsf13145533black
BAC0904102604yellow
sdf_ada_9541-9543.1fred

# reading the FIRST file specified on the command line.
# create an array 'arr' indexed by the FIRST field ($1) of the file with the value from the THIRD
# field ($3) of the file. Jump to the 'next' record without executing the rest of the code.
FNR==NR { arr[$1]=$3; next }

# reading the SECOND file specified on the command line.
{

  # iterate through all the entries in array 'arr' - 'i' contains the INDEX to array 'arr'
  # substitute a value of 'i' from the begging of the line (^) with the value of 'arr[i]'.
  # 'gsub' returns the NUMBER of the performed substitutions
  # add the number of the substitutions to an array 'sum' indexed by 'arr[i]'
  for( i in  arr)
     sum[arr[i]]+=gsub("^" i, arr[i])
}
END {

  # iterate through the array 'sum' outputting the total number of the performed substitutions
  # per pattern/prefix
  for (i in sum)
    printf("[%s] -> [%d]\n", i, sum[i])
}