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how to read special characters in shell script

Posted on 2007-11-26
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Last Modified: 2013-12-26
How to read special characters in bash shell?
I need to read 2 file names which could contain special characters, like $ # etc.
I am appreciate someone can help me with this. this code is really make me crazy. Thanks
#!/bin/bash
#Process one file##############
read() {
     tempPoint=0
     line=1
     while [ $line -le $lineCount ]
     do    
	subPoint=`sed -n "$line"p $file | awk '{print $2}'`
        name=`sed -n "$line"p $file | awk '{print $1}'	`
        if [ -n "$name" ]
        then {
        if [ $Name = $name ]
        then
        {
        tempPoint=$subPoint
        }
        fi
        }
        fi
        line=`expr $line + 1`
    done
    if [ $tempPoint -ne 0 ]
    then
    	totalPoint=`expr $totalPoint + $tempPoint`
    fi
}
######main program###############
 
if [ $# -eq 0 ]
then
    echo "no arguments"
    echo
    exit 1
fi
if [ $# -eq 1 ]
then
    echo "no files"
    echo
    exit 1
fi
if [ $# -eq 2 ]
then
    echo "no files"
    echo
    exit 1
fi
Name=$1
shift
totalPoint=0
total=0
until [ $# -eq 0 ]
do
    if [ -f "$1" ]
    then
     {
     file=$1
     total=`expr $total + 1`
     lineCount=`wc -l < $file`
     read
    }
    fi
    shift
done
 
if [ $total -eq 0 ]
then
{
   echo "no files"
   echo
}
else
{
   echo $Name "AVG:" `expr $totalPoint / $total`
}
fi

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Question by:matchge
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8 Comments
 
LVL 48

Expert Comment

by:Tintin
ID: 20355385
What problem are you having?  Works fine for me.  Remember that you should quote filenames with funny characters, eg:

script 'file1$#' 'file2$%'
0
 

Author Comment

by:matchge
ID: 20355465
Thank you very much.
But what if I want to input without the single quote?
Thanks for ur comments.
0
 
LVL 48

Expert Comment

by:Tintin
ID: 20355514
Very much depends on your shell.

For example in bash, you can set the GLOBIGNORE environment variable to ignore various glob characters such as * and ?, eg:

export GLOBIGNORE=*:?

However, for $, you need to escape it with either single quotes or backslash, eg:

script file1\$#
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Author Comment

by:matchge
ID: 20355600
So,you mean I need to consider all the possibility $,#,\,'," etc? Is there any fast and convince way to handle them all?
Thank you ~~~
0
 

Author Comment

by:matchge
ID: 20355642
where can I find out how to handle other special characters? like #,space,',",\ ?
0
 
LVL 48

Accepted Solution

by:
Tintin earned 125 total points
ID: 20355824
Using single quotes is the most reliable, simple way of specifying meta-characters.  If the data also includes a single quote, you need to use a backslash, eg:

'abc\'def'
0
 
LVL 51

Assisted Solution

by:ahoffmann
ahoffmann earned 125 total points
ID: 20397628
> Is there any fast and convince way to handle them all?
simply prefix each character by \  (backslash)
Otherwise you have to use quotes or a shell which has no meta characters.
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