usrmnt.sh

Shall高级编程

#!/bin/bash
# usrmnt.sh, written by Anthony Richardson
# Used with permission.

# usage:       usrmnt.sh
# description: mount device, invoking user must be listed in the
#              MNTUSERS group in the /etc/sudoers file.

# ----------------------------------------------------------
#  This is a usermount script that reruns itself using sudo.
#  A user with the proper permissions only has to type

#   usermount /dev/fd0 /mnt/floppy

# instead of

#   sudo usermount /dev/fd0 /mnt/floppy

#  I use this same technique for all of my
#+ sudo scripts, because I find it convenient.
# ----------------------------------------------------------

#  If SUDO_COMMAND variable is not set we are not being run through
#+ sudo, so rerun ourselves. Pass the user's real and group id . . .

if [ -z "$SUDO_COMMAND" ]
then
   mntusr=$(id -u) grpusr=$(id -g) sudo $0 $*
   exit 0
fi

# We will only get here if we are being run by sudo.
/bin/mount $* -o uid=$mntusr,gid=$grpusr

exit 0

# Additional notes (from the author of this script): 
# -------------------------------------------------

# 1) Linux allows the "users" option in the /etc/fstab
#    file so that any user can mount removable media.
#    But, on a server, I like to allow only a few
#    individuals access to removable media.
#    I find using sudo gives me more control.

# 2) I also find sudo to be more convenient than
#    accomplishing this task through groups.

# 3) This method gives anyone with proper permissions
#    root access to the mount command, so be careful
#    about who you allow access.
#    You can get finer control over which access can be mounted
#    by using this same technique in separate mntfloppy, mntcdrom,
#    and mntsamba scripts.