A wild card is a character that can be used as a substitute for any of a class of characters in a command. It can increase the flexibility and efficiency of our commands.
The above command will list all file name that start with
ab etc if they exist.
The above command will list all file name that have three characters in its name & the name must start with
ab and the last character will be anything like
abZ etc if they exist.
The above command will list files that have name like
ab3 if they exist.
We can also specify a range for this wild card.
ls ab[a-f] ls ab[1-9] ls ab[a-z]