linux - Finding the Number of strings in a File -

i'm trying write small program check number of sub strings in large text file. count first 2000 lines of text file, find "ttt" sub-strings, count them, , set variable total. i'm bit new shell, amazingly appreciated!

#!/bin/bash  $counter=(head -2000 [file name] | grep ttt | grep -o ttt | wc -l) echo $counter 

for it's worth might awk better suited task:

awk -f"ttt" '{j=(nf-1)+j}end{print j}' filename 

this split each record in file delimiter "ttt". counts number of fields, subtracts one, , adds total.

a file like:

ttt tttttt 1 5 ttt tt 1 more ttt record 

would split (visualizing pipe delim) like:

| || 1 5 | tt 1 more | record 

counting number of fields per record:

4 2 1 2 

subtracting 1 that:

3  1 0 1 

which totals 5, how many "ttt" substrings present.

to incorporate script (and fixing other issue):

#!/bin/bash  counter=$(awk -f"ttt" '{j=(nf-1)+j}end{print j}' filename) echo $counter 

the change here when set variable in bash don't include $ sign @ front. in referencing variable include $.