Shell Programming and Scripting

awk '/PATTERN/{i++}i' file

awk 'FNR==NR     {i=0}
     /PATTERN/   {i++}
     i
    ' file

1.txt
2.txt
3.txt
4.txt

new1.txt
new2.txt
new3.txt
new4.txt

.
.
.
     i  {print > "new"FILENAME}

 
for file in *.txt
 do

 awk 'NR==1{i=0}
     /PATTERN/   {i++}
     i
    ' $file > "new"$file

 rm $file
 done

awk 'FNR==1      {i=0}
     /PATTERN/   {i++}
     i           {print > "new"FILENAME}
    ' *.txt