Question: 1. Describe a scenario in which file name expansion using wildcards would be useful. 2.Explain ho……

1. Describe a scenario in which file name expansion using wildcards would be useful. 2.Explain how ? and * differ

3.What command could you enter so that test_1.txt, test_2.txt and test_3.txt are listed but not test_1?

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1). File name expansion are used to display a list of file that meets the requirement using a single command. File name expansion uses wildcard like ? , * to create a pattern, and file name matching the pattern are displayed.

Example, 1). pattern /etc/* will expand to a list of all the files in /etc.

2).pattern /etc/rc?.d will expand to a list of filenames that begin with rc followed buy a single character and then followed by .d

2).

* : Matches with any group of 0 or more characters whereas ? matches exactly one character

Example: If we have following files in the current directory:

createbackup.sh  list.sh  lspace.sh        speaker.sh l1
listopen.sh      lost.sh  rename-files.sh  topprocs.sh l2

ls l* will display the files

list.sh  lspace.sh  listopen.sh  lost.sh l1 l2

ls l? will display the files:

l1 l2

3). ls test_[123].txt

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