System information

An Introduction to Shells in General
Axis Communications AB provides NO support for application development of any kind. The information
here is provided "as is", and there is no guarantee that any of the examples shown will work in your
particular application.
Revision 1.02 October 2002 60
5.3.50 true
Syntax: true
Return an exit code of TRUE (0).
Example:
$ true
$ echo $?
0
5.3.51 tty
Syntax: tty
Print the file name of the terminal connected to standard input.
Options:
-s print nothing, only return an exit status
Example:
$ tty
/dev/tty2
5.3.52 umount
Syntax: umount [flags] filesystem|directory
Unmount file systems.
Flags:
-a: Unmount all file systems in /etc/mtab
-n: Don't erase /etc/mtab entries
-r: Try to remount devices as read-only if mount is busy
-f: Force filesystem umount (i.e. unreachable NFS server)
-l: Do not free loop device (if a loop device has been used)
Example:
$ umount /dev/hdc1
5.3.53 uname
Syntax: uname [OPTION]...
Print certain system information. With no OPTION, same as -s.
Options:
-a print all information
-m the machine (hardware) type
-n print the machine's network node hostname
-r print the operating system release
-s print the operating system name
-p print the host processor type
-v print the operating system version
Example:
$ uname -a