Question

a) How would you use the ls command to display all of the files/directories in the directory ‘/sbin’ that start with ‘bl’?

b) How would you use the ls command to display all of the files/directories in your current directory that contain the word ‘grade’ somewhere in the name and end with ‘.pdf’?

c) How would you use the ls command to display all of the files/directories in your current directory that are any two characters followed by the file extension ‘.py’?

d) What is the purpose of a wildcard?

Answer 1

a) ls -d /sbin/bl*

-- will display the files and directores that starts with letters 'bl'

b) ls *grade*.pdf

-- will gives the filename containing the word 'grade' somewhere in the
filename and ends with '.pdf'

c) ls -d ??.py

-- gives the any two characters in the filename and ends with extension '.py'

d) purpose of wildcard

1) wildcards are used in linux terminal in searching files and folders
2) wildcards are also used in SQL queries to find the string from the tables
3) wildcard patterns are used in regular expressions

screenshot of output

$ 1s -d /sbin/m sbin/mkfs.bfs. exe sbin/mkfs.exe /sbin/mkfs. cramfs.exe /sbin/mkfs.minix. exe /sbin/mkswap. exe s 1s grade#. pdf ff_grade. pdf first_grade_std. pdf grade_std. pdf S 1s -d ?7.py xy.py