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Top Forums Shell Programming and Scripting if (disk is mounted) unmount if (disk is unmounted) mount Post 302503797 by hollister on Friday 11th of March 2011 05:20:01 PM
Old 03-11-2011
Question if (disk is mounted) unmount if (disk is unmounted) mount

Hey there, sorry if this is a bit too much of a noob question, trying to get to grips with a simple bash script - but i have done ZERO bash scripting.

basically having worked out how to mount and unmount disks using:
disktool -m *device* & disktool -e *device*

- and looking at the result of disktool -l
i see that from the results each device has a parameter Mountpoint = '/Volumes/My Disk' if the "My Disk" is mounted - or - Mountpoint = '' if unmounted.

Basically I am looking to write a script that looks to see if a partition on my external disk is mounted or not, if it is mounted - then the disk is unmounted - - and if it is unmounted the disk is mounted.

So this this disk is disk1s2. How do I query the Mountpoint and see what the result is?

Basically :

if (disk1s2.Mountpoint == "") {
disktool -m disk1s2
}

if (disk1s2.Mountpoint == "/Volumes/My Disk") {
disktool -e disk1s2
}

^ is obviously very, very, very wrong for a bash script - but you get the gist.

Any help would be greatly appreciated
 

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df(1)							      General Commands Manual							     df(1)

Name
       df - display free and used disk space

Syntax
       df [-i] [-l] [-n] [filesystem...] [file...]

Description
       The command displays the amount of disk space available on the specified file system, for example, It also displays the amount of available
       disk space on the file system in which the specified file is contained, for example, If a device is given that has no file systems  mounted
       on  it,	displays  the  information  for  the  root file system.  Without any arguments or options, displays shows all mounted filesystems,
       including those manually mounted without use of the file.  The numbers are reported in kilobytes.

       Unless the -n option is specified, updates the statistics stored in memory for the file system specified, before it  returns  the  informa-
       tion.

Options
       -i   Also report the number of used and free inodes.

       -l   Reports on locally mounted disks only.

       -n   Do	not  update the file system statistics stored in memory.  Instead, return whatever statistics are stored in memory.  This prevents
	    from hanging in the event that a server containing the specified file system is down.

Restrictions
       You cannot use the command to find free space on an unmounted file system using the block or character special device name.   Instead,  use
       the command.

Examples
       % df
       Filesystem     Total    kbytes  kbytes	%
       node	      kbytes   used    free	used	Mounted on
       /dev/ra1a       7429    2085    4602	31%    /tmp
       /dev/ra0e      30519   14817   12651	54%    /usr/spool
       /dev/ra0h     313233  122858  159052	44%    /usr/staff1

       The  total  disk  space is the total space that was created during the making of the file system.  The addition of the used space, the free
       space and a percentage of reserved space is the total space.  The default value for the reserved space is 10%.

Files
       List of mounted file systems

See Also
       getmnt(2), fstab(5), dumpfs(8), icheck(8), mkfs(8), newfs(8), quot(8)

																	     df(1)
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