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Debugging a beginner shell script...

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# 1  
Old 02-02-2010
Debugging a beginner shell script...
I have been following a tutorial on bash which has proven to be very helpful. However, i am stuck with a command not found issue when asking for a y/n response from the user. Below is the part of code I believe is giving me grief... I have been trying to work through this for 3 hours now.... Please let me know if you see anything here or need a larger sample of code to review.
Thanks very much...

========================================================

Code:
if [ "$interactive" = "1" ]; then
        response=

        echo -n "Enter name of output file [$filename] > "
        read response
        if [ -n "$response" ]; then
             filename=$response
        fi
set -x

        if [ -f $filename ]; then
                echo -n "Output file exists. Overwrite? (y/n) > "
                read response
                if ["$response" != "y"]; then
                echo "Exiting Program"
                exit 1
        fi

fi
fi

set +x

===================================================
Last edited by pludi; 02-03-2010 at 02:26 AM.. Reason: code tags, please..
# 2  
Old 02-02-2010
You need to use appropriate spacing inside the test brackets. Try:
Code:
if [ "$response" != "y" ]; then

# 3  
Old 02-03-2010
Quote:
Originally Posted by brokepunk
i am stuck with a command not found issue when asking for a y/n response from the user.

When you get an error message, read it!.

The message would tell you which command was not found. Is what it tells you an actual command or is it a typo?
# 4  
Old 02-03-2010
Thank you...
You were correct Scrutinizer, it was the spacing. I did read the error message but could not make sense of it until the folly of my ways was made clear to me...
So that part of the script is now fully functional but I cannot get permissions on the .gvfs to be read from superuser. I have read that this is a fuse mount point, and therefor not located in /etc/fstab. so When I unmount it, chmod and try to mount again... it bombs out not knowing where to look. There are a few more chapters on the tutorial I am working on, but before I complete them, I would like o understand my current issue. My first post got me scolded by a mod for not using correct code tags, so I am going to try this again with the entire script.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Code:
#!/bin/bash

# systeminfo - A script to produce an HTML file with system info.

##### Constants

TITLE="System Information for $HOSTNAME"
RIGHT_NOW=$(date +"%x %r %Z")
TIME_STAMP="Updated on $RIGHT_NOW by $USER"

##### Functions

function press_enter
{
        echo ""
        echo -n "Press Enter to continue"
        read
        clear
}

function system_info
{
     echo "<h2>System release info</h2>"
     echo "<p>Function not yet implimented</p>"

}    # end of system_info

function show_uptime
{
     echo "<h2>System Uptime</h2>"
     echo "<pre>"
     uptime
     echo "</pre>"

}    # end of show_uptime

function drive_space
{
     echo "<h2>Filesystem space</h2>"
     echo "<pre>"
     df
     echo "</pre>"

}    # end of drive_space

# this is the function that requires superuser. I changed the id to 1000 just to see results and it worked, but no dice with root.

function home_space
{
 # Only superuser can get this information

 if [ "$(id -u)" = "0" ]; then
     echo "<h2>Home directory space by user</h2>"
     echo "<pre>"
     echo "Bytes Directory"
     du -s /home/* | sort -nr
     echo "</pre>"
 fi

}    # end of home space

function write_page
{
    cat <<- _EOF_
    <html>
        <head>
        <center>
        <title>$TITLE</title>
        </center>
        </head>
        <body>
        <center>
        <h1>$TITLE</h1>
        <p>$TIME_STAMP</p>
        $(system_info)
        $(show_uptime)
        <table border="1">
        <tr>
        <td>
        $(drive_space)
        </td>
        <td>
        $(home_space)
        </td>
        </table>
        </center>
        </body>
    </html>
_EOF_

}

function usage
{
    echo "usage: systeminfo [[[-f file ] [-i]] | [-h]]"
}

press_enter

##### Main

interactive=
filename=~/system_page.html

while [ "$1" != "" ]; do
    case $1 in
        -f | --file )           shift
                                filename=$1
                                ;;
        -i | --interactive )    interactive=1
                                ;;
        -h | --help )           usage
                                exit
                                ;;
        * )                     usage
                                exit 1
    esac
    shift
done

if [ "$interactive" = "1" ]; then
        response=

        echo -n "Enter name of output file [$filename] > "
        read response
        if [ -n "$response" ]; then
             filename=$response
        fi


 if [ -f $filename ]; then
                echo -n "Output file exists. Overwrite? (y/n) > "
                read response
                if [ "$response" != "y" ]; then
                echo "Exiting Program"
                exit 1
        fi

fi
fi


# Write page

 write_page > $filename

++++++++++++++++++++++++++++++++++++++++++++++++++++++=

All help will be greatly appreciated.
# 5  
Old 02-03-2010
If this is an online tutorial are you able to post a link to a topic which defines ".gvfs" .
Please also post what Operating System and hardware you have because questions about mountpoints are invariably specific to the Operating System and hardware.
# 6  
Old 02-03-2010
This online tutorial had no mention of the .gvfs issue. I found that out by running the script, then spending the next few hours trying to find why my permissions were denied. The .gvfs is located in /home/username. Im still not 100% on what it does or how it works and will do more reading on it today. However I tried chmod 777 and chown root under su and it still gave me permission denied. HOW IS THAT EVEN POSSIBLE!!!
Currently running ubunto 9.10 karmic
x86 plenty o' ram and two dual core 2ghz procs.

The function causing the problem is "home_space"
When I changed id -u to 1000(my group((is that a group, you know where root is 0?)) ) I weas able to push some results to the html page produced, permission denied errors show in bash, but not in the results ( pleasent suprise ).

Thank you again, and I am new to these forums... I promise I will get more concise when I learn what information will best help other members help me...

Writing shell scripts - Lesson 13: Positional Parameters

Above is a link to the tutorial I am following... I am a little farther along then this page, but this is where things start to fall apart.
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