CSC322 C Programming and UNIX - Department of Computer ...

UNIX User Commands: echo and touch
echo . . . prints its arguments to the screen
– echo is often a shell built-in command. To guarantee the behavior described
in the man-page, use /bin/echo
– Example:
[schulz@gettysburg ∼]$ echo ”Hello World”
Hello World (simplest ”Hello World” program in UNIX)
[schulz@gettysburg ∼]$ echo ’$PATH = ’ $PATH
$PATH = .:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/us
r/java/jdk1.3.1 01/bin:/home/graph/schulz/bin:/usr/X11R6/bin
touch . . . sets the access and modification time of the given files to
the current time
– If one of the files does not exist, touch will create an empty file of that name
– Important option:
∗ -c: Do not create non-existing files (long form --no-create is supported by
modern implementations (GNU))
∗ Other options: man touch
Stephan Schulz 42