BCS215 unix
exercises for '18/2/8

cd ~		# Your home dir
pwd
ls -l

mkdir 208
cd 208
pwd

touch a b c	# Create 3 files, here
ls -l
touch .p	# Create a file named ".p"
ls -l		# Where is it?
ls -la		# Notice . and ..
ls -a ..	# View parent directory

touch apple ape abc
touch r123 r234 r345 rock
touch up
ls


cat > greetings		# Use cat to enter text from stdin
	Hello!
	How are you?
	I am fine.
	Goodbye				
	Ctrl-D				# ^D is EOF
tail -2 greetings
			# Show last two lines.

echo File name "globbing" in unix

cat > globbing
	*		matches		Anything (including empty string)
	?		matches		Exactly one character (but not empty string)
	[345]		matches		3 or 4 or 5
	[3-5]			  	(ditto)
	*.{jpg,jpeg,JPEG}  matches	any file names ending in .jpg, .jpeg, or .JPEG
					(but not *.JPG)		
Ctrl-D				# ^D is EOF


















echo  Now, try some globbing.

ls a*
ls g*
ls *e

ls a*c
ls *c
ls *c*

ls r*
ls r[12]*

ls ?p*
ls [a-g]*

echo ALL DONE!  Go home.
cd			# Default is ~
pwd
rmdir 208		# Why is 208 still there?



mkdir sub
cd sub
touch xyz
touch .pqr

cd ..
ls sub			# Where is .pqr?
la -a sub

rmdir sub		# Why does this fail?

ls -a sub
rm sub/.pqr
rmdir sub



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