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LDP/guide/docbook/abs-guide/script-array.sh

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+#!/bin/bash
+# script-array.sh: Loads this script into an array.
+# Inspired by an e-mail from Chris Martin (thanks!).
+
+script_contents=( $(cat "$0") )  #  Stores contents of this script ($0)
+                                 #+ in an array.
+
+for element in $(seq 0 $((${#script_contents[@]} - 1)))
+  do                #  ${#script_contents[@]}
+                    #+ gives number of elements in the array.
+                    #
+                    #  Question:
+                    #  Why is  seq 0  necessary?
+                    #  Try changing it to seq 1.
+  echo -n "${script_contents[$element]}"
+                    # List each field of this script on a single line.
+  echo -n " -- "    # Use " -- " as a field separator.
+done
+
+echo
+
+exit 0
+
+# Exercise:
+# --------
+#  Modify this script so it lists itself
+#+ in its original format,
+#+ complete with whitespace, line breaks, etc.

LDP/guide/docbook/abs-guide/usrmnt.sh

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+#!/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.
+