a) echo *
all the files
b) echo *[!0-9]
all the files that don't end in a number, memo2.sv
c) echo m[a-df-z]*
any file starting with an m followed by any lowercase letter other than e.
d) echo [A-Z]*
all files starting with an upper case letter
e) echo jan*
all files starting with jan
f) echo *.*
all files with a name that contains a . UNIX is not MS-DOS there is no need for a file to have a .
in its name.
g) echo ?????
any file with a five character name
h) echo *89
any file ending with 89
i) echo jan?? feb?? mar??
jan85 jan86 jan87 jan88 feb86 mar88
j) echo [fjm] [ae] [bnr] *
feb86 jan12.89 jan19.89 jan26.89 jan5.89 jan85 jan86 jan87 jan88 mar88
2-2.
a) ls wc -1
Count the number of lines output by the ls command. This has the affect of counting how many
files are in the current directory. When output from ls is sent to the screen it is usually put into
columns. Whenever the output from lsis sent to a pipe it is sent one filename per line. Try the
following commands ls and ls | cat Do you see the difference?
b) rm ???
remove all files with three character filenames from the current directory
c) who wc -1
Count the number of lines output by the who command. In effect this counts the number of users
who are currently logged onto the computer.
d) mv progs/* /usr/steve/backup
Move all the files from the progs subdirectory into the directory /usr/steve/backup
e) ls *.c wc -1
See a). This command counts the number of files with .c extensions in the current directory.
f) rm *.o
Remove all files with a .o extension from the current directory
g) who sort
Sort the output of the who command in alphabetical order.
h) pwd
Display the current working directory
i) cp memo1 ..
Copy the file memo1 into the parent directory
j) plotdata 2>errors &
