Shell Programming and Scripting

 
SEQ=200
awk -v S="$SEQ" '
         
        $0 ~ S { 
         N++
  print N
  }
  
        
   
' "$1"ascii >"$1"search

awk -v S="$SEQ" '     
        $0 ~ S { 
                    N++
        }
        END {
                 print N
        }
'

man awk

 
for i in 200 202 203
do
SEQ=$[i]
awk -v S="$SEQ" '
         m=$0{
   getline
                if ( $0 == S )
           {
                    N++
     }
        }
        END {
                print "the context is " m " the character is  " S " count "N 
        }
 
 
 
' "$1"ascii >>"$1"search
done

 
the context is 13 the character is  200 count 4070
the context is 13 the character is  202 count 5634
the context is 13 the character is  203 count 695

 
195
218
200
225
228
202
32
230

 
the context  - previous record -  is 228 the character - current record - is 202 counts 1 times 
the context is 218 the character is 200 counts 1 times