Create file.txt with the following content:

48  Dec  3BC1977  LPSX 68.00  LVX2A  138
483 Sept 5AP1996  USP  65.00  LVX2C  189
47  Oct  3ZL1998  LPSX 43.00  KVM9D  512
219 dec  2CC1999  CAD  23.00  PLV2C  68
484 nov  7PL1996  CAD  49.00  PLV2C  234
483 may  5PA1998  USP  37.00  KVM9D  644
216 sept 3ZL1998  USP  86.00  KVM9E  234

Count lines containing "48":

grep -c "48" file.txt

Show line numbers for lines containing "48":

grep -n "48" file.txt

Match lines with exact word "48":

grep -w "48" file.txt

Extract records with codes 484 or 483:

grep -E "(484|483)" file.txt

Display lines not starting with 4 or 8:

grep -E "^[^48]" file.txt

Find lines contianing September (Sept):

grep -w Sept file.txt

Show codes beginnnig with K and ending with D:

grep -E "\bK.*D\b" file.txt

Locate codes with two uppercase letters followed by any characters ending in C:

grep -E "\b[A-Z]{2}.*C\b" file.txt

Retrieve records starting with 5 and ending with either 1996 or 1998:

grep -E "\b5.*(1996|1998)\b" file.txt