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How to handle variable with special character?


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# 8  
Pseudocode which doesn't do what you want really doesn't tell us what you do want. What is $1 here? And what is 'grep $1' for? It's not going to do anything where you've put it.

Also, I noted above that [ -f * ] is a bad idea since it will fail with syntax errors whenever you match more than one file.

Also, you're still not quoting any of your variables and really should be.
# 9  
Quote:
Originally Posted by Corona688
Pseudocode which doesn't do what you want really doesn't tell us what you do want. What is $1 here? And what is 'grep $1' for? It's not going to do anything where you've put it.

Also, I noted above that [ -f * ] is a bad idea since it will fail with syntax errors whenever you match more than one file.

Also, you're still not quoting any of your variables and really should be.


thanks Corona688 for the explanation.
my bad, I didn't explain it clearly.
the requests is pass a value (eg: v$abc) when calling the script, get file directory and file name from master file. (below is sample master file), then go to corresponding directory, rename file (may need split the file as well). below pseudocode is testing code to check I can use variable with "$" sign. yes, there may have more than one files matching. could you please advise the best way to handle multiple matches. thanks in advance


Code:
 sample master
directory, filename
abc, v$abc_nau
abc, v$eee_bxy
cde, v$abc_nau



Code:
 #!/bin/ksh
while read filename
do
if [ -f ${filename}* ]; then
mv ${1}* ${1}_newname
fi
done<masterfile|grep ${1}


command to call the script:
Code:
 ksh scriptname 'v$abc'

# 10  
Quote:
Originally Posted by green_k
thanks Corona688 for the explanation.
the requests is pass a value (eg: v$abc) when calling the script, get file directory and file name from master file.
OK.
Quote:
then go to corresponding directory, rename file (may need split the file as well).
May? What decides that?

Quote:
below pseudocode is testing code to check I can use variable with "$" sign.
That is gibberish.
Quote:
yes, there may have more than one files matching. could you please advise the best way to handle multiple matches.
I already showed you one way, if you don't like it, perhaps you need to tell me what you're expecting to happen.

And your code still has that grep on the end which will do exactly nothing where you've put it and I don't know what you're expecting it to do if you put it anywhere else. What is it for?

command to call the script:
Code:
 ksh scriptname 'v$abc'

OK, questions remaining:
  • "variable with $" -- We already told you v$abc is not a variable, so what do you mean now?
  • Splitting the file -- when do you want this to happen, why, how?
  • Multiple matches -- what do you top expect to happen, why, how?
  • What, exactly, are you hoping that grep will do?
# 11  
I think I finally get it -- that grep is supposed to find the line in the file you want. What for, I'm not certain, as you don't use the file for anything, yet. So I'm also wild-guessing that the 'dir' part of the file ends up being part of the destination file name.

Please try this code and see if it does anything like what you want. It won't actually move any files, just print 'mv inputfile outputfile'.
Code:
#!/bin/ksh

# We use a function, so overwriting $1 $2 ... won't affect anything outside
function checkfile {
        dir="$1"
        set -- "${2}"* # Match one or more files, placing in local $1 $2 ...
        if [ ! -f "${1}" ]
        then
                echo "${1} not found" >&2
                return 1
        fi

        echo mv "${1}" "${1}_${dir}"
}

while IFS=", " read dir filename # Split input upon spaces and commas
do
        # Skip lines where filename doesn't match the argument given.
        [ "$1" = "$filename" ] || continue
        # call checkfile.  Inside checkfile, $1=$dir and $2=$filename
        checkfile "$dir" "$filename"
done<masterfile


Last edited by Corona688; 11-23-2018 at 11:49 AM..
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