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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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Comment
Question by:matchge
  • 3
  • 3
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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