59 lines
2.3 KiB
Bash
59 lines
2.3 KiB
Bash
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#!/bin/bash
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# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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# Champlain College SDEV-415-81
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#
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# Linux/Unix Programming Week 13: Loops and Function - (2020/12/06)
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#
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# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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#
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# Write a program called mchecker to check for new mail and
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# write a message to the screen if new mail has arrived.
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# The program will get the size of the mail spool file for the user.
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# (The spool files are found in /var/spool/mail/$USER on Linux,
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# Use the find command if you cannot locate the file.)
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# The script will execute in a continuous loop, once every 30 seconds.
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# Each time the loop executes, it will compare the size of the mail spool
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# file with its size from the previous loop. If the new size is greater than
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# the old size, a message will be printed on your screen,
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# saying “Username, You have new mail”.
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# The size of a file can be found by looking
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# at the output from ls –l, wc –c or from the find command.
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#
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# Note: To test this, you can simply edit the spool file to add a new entry.
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# (echo "More data" >> /var/spool/mail/$USER)
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# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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#
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# Written by Llewellyn van der Merwe <llewellyn.vandermerw@mymail.champlain.edu>, December 2020
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# Copyright (C) 2020. All Rights Reserved
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# License GNU/GPL Version 2 or later - http://www.gnu.org/licenses/gpl-2.0.html
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#
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# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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# path to the spool mail file
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FILENAME=/var/spool/mail/$USER
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# check if this file exist
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if [ ! -f $FILENAME ]; then
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# give console error
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echo "The mail spool file for $USER does not exist in [$FILENAME]."
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# break out here
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exit 1
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fi
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# the size tracker
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LASTFILESIZE=0
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# start the continuous loop
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while true; do
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FILESIZE=$(stat -c%s "$FILENAME")
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if [[ $FILESIZE -gt $LASTFILESIZE ]]; then
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# only give message if LASTFILESIZE is greater than 0
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if [[ $LASTFILESIZE -gt 0 ]]; then
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# give notice to console
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echo "${USER^}, You have new mail"
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fi
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# set the new size
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LASTFILESIZE=$FILESIZE
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fi
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# run this check again every
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# 30 seconds
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sleep 30s
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done
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