Shell script to delete some lines...
 

I have a text file as follows :


7294 S/3529/1994()


7295 S/3540/1994()


7296 S/3545/1994()
A.


7297 S/3546/1994()


7298 S/3548/1994()
","


7299 S/3551/1994()
&


7300 S/3557/1994()
CHOL
The first column is the serial no.

I want to delete all the lines which does not start with the serial number.

How can it be done using shell script or sed ?

Jagdish

Assuming your serial number is exactly 4 digits - if it isn't, you'll need to explain the rules

Or use the same regex, but instead extract all the wanted lines with grep.