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Using variable as a file name

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# 8  
Old 03-18-2013
Quote:
Originally Posted by hanson44
I can't find the problem. Sorry.

Why is the xxd command in back-ticks, since results not assigned to anything? Just wondering.
Code:
`xxd -a > "$ofname".txt`

Well, at least I feel a little better that my problem wasn't glaringly obvious. But then I feel bad again because I still don't know what the hell is going on.

Sometimes I put those around stand alone commands. Weird habit I picked up that I'm trying to break.
# 9  
Old 03-18-2013
Quote:
Originally Posted by twjolson
Sometimes I put those around stand alone commands. Weird habit I picked up that I'm trying to break.
Not merely odd but actively bad, since any output can cause the shell to spit a syntax error. Worst case, if the command outputs a valid program name, it may be run.
# 10  
Old 03-18-2013
Quote:
Originally Posted by Corona688
Not merely odd but actively bad, since any output can cause the shell to spit a syntax error. Worst case, if the command outputs a valid program name, it may be run.
Point taken.

Regardless, that isn't the cause of my current problems. I removed them, and it's still acting the same.
# 11  
Old 03-18-2013
Have you echoed the variables to see if they are what you think? Put quotes around them to see if spaces or nonprinting characters have fouled it up somehow.

Code:
echo "x is '$x'"

# 12  
Old 03-19-2013
Quote:
Originally Posted by twjolson
. . .
Code:
sum ./$iname/Unallocated*.raw | while read line
    do
        if [ `echo $line | awk '{print $1}'` = 00000 ]
            then
                echo $line | awk '{print $3 " is empty, disregarding."}'

            else
                echo $line | awk '{print $3 " is not empty.  Creating XXD report"}'
                ofname=`echo $line | awk '{print $3}'`                
                `xxd -a > "$ofname".txt`
        fi
    done

Why don't you post an execution log (xtrace on) so we can see what's happening?

And, BTW, why do you read line and then awk the relevant fields instead of read DISK STH PART REST and then use those variables? Then you will know if the output file name is empty or not.
# 13  
Old 03-19-2013
Quote:
Originally Posted by RudiC
Why don't you post an execution log (xtrace on) so we can see what's happening?

And, BTW, why do you read line and then awk the relevant fields instead of read DISK STH PART REST and then use those variables? Then you will know if the output file name is empty or not.
Forgive my lack of knowledge, but I know nothing of xtrace. The searches I've done on it since reading your message didn't shed any additional light on it. More information would be welcome.

I mean, using echos of the variables at various places shows that those are performing as expected. Using bash -xv shows that everything is performing as expected, except this one command. I can't figure it out.

I used while read line because I know that. I have never heard of read DISK STH PART REST. What does that do?
# 14  
Old 03-19-2013
I think the syntax is wrong, isn't this the correct syntax, assuming you want to take hex dump of $ofname and redirect o/p to another text file ${ofname}.txt?
Code:
xxd -a "$ofname" > "${ofname}.txt"
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