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Deleting table cells in a script

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Top Forums Shell Programming and Scripting Deleting table cells in a script
# 1  
Old 12-05-2008
Deleting table cells in a script
I'd like to use sed or awk to do this but I'm weak on both along with RE. Looking for a way with sed or awk to count for the 7th table data within a table row and if the condition is met to delete "<td>and everything in between </td>". Since the table header start on a specific line each time, that I can delete using sed easy.

Stumped on how to get rid of the other data in that column. Also, the table the script retrieves may vary in length and this is the reason why I'd like it scripted as I've described. If you have any better ideas, I'm open to them.


For those that like gui's here's a simple diagram:

Code:
qrstuvwxyz
qrstuvwxyz
qrstuvwxyz

Code:
qrstuvwyz
qrstuvwyz
qrstuvwyz

# 2  
Old 12-05-2008
Quote:
Originally Posted by phpfreak
Looking for a way [...] to count for the 7th table data within a table row
Do you mean *every* 7th occurrance of <td> within *every* <tr> in a file??
# 3  
Old 12-05-2008
Almost there...

Code:
sed -n '/<tr>/,/<\/tr> {
           s/.*<tr>//
           s/<\/tr>.*//
           p
           }' /path/to/my/file

That's correct. If that condition is met I need it to do the above. Thanks.
# 4  
Old 12-05-2008
This is the simplest answer, if the table data is the same and ONLY in that 7th table data and nowhere else you could use this:

Code:
 
cat myfile |sed 's|<td>x</td>||g'

NOTE
I am using "|" as the delimeter and not "/" so I do not have to escape the "/" in "</td>"...


However if you have other table data fields with the same text and you wish to keep these other cels you may wish to use a loop to parse the tokens and count the "<td>" occurances and then do a test to figure out if this cel matches what you are looking for before handing to sed.

SIMPLE EXAMPLE OF LOOP:

Code:
OUTFILE=/some/file
TD=0
CT=0
cat myfile |while read LINE
do
    # Check to see if the LINE is non-empty, and has a <td> tag in it.
    if [ -n "$LINE" -a `echo $LINE |grep "<td>"` != "" ]
    then
        # Increase the TD counter by 1
        CT=`echo "$CT+1" |bc`
        
        # Check to see if the TD counter is at 6 (we are at 7th TD as the counter starts at 0 not 1)
        if [ "$CT" -eq 6 ]
        then
            # Use sed to remove this TD tag
            echo $LINE |sed 's|<td>x</td>||' >> $OUTFILE
        else 
            echo $LINE >> $OUTFILE
        fi
    else
        echo $LINE >> $OUTFILE
    fi
    
    # If we are leaving a table row the we need to reset the TD counter!
    if [ -n "$LINE" -a `echo $LINE |grep "</tr>"` != "" ]
        CT=0
    fi
done

Note that this does NOT account for multiple "<td>" tags on one line.
# 5  
Old 12-05-2008
Ok I think I follow and I'm going to combine with my sed script to test. Please review it below as I've made some revisions. Remember, my goal is to remove everything between the table data tags and the content within will vary, it'll never be the same.


Code:
#!/bin/sh

#TD=0
CT=0
cat oldfile.html |while read LINE
do
    # Check to see if the LINE is non-empty, and has a <td> tag in it.
    if [ -n "$LINE" -a `echo $LINE |grep "<td>"` != "" ]
    then
        # Increase the TD counter by 1
        CT=`echo "$CT+1" |bc`
        
        # Check to see if the TD counter is at 6 (we are at 7th TD as the counter starts at 0 not 1)
        if [ "$CT" -eq 6 ]
        then
            # Use sed to remove this TD tag AND everything in between
            echo $LINE |sed -n '/<tr>/,/<\/tr> {
					    s/.*<tr>//
					    s/<\/tr>.*//
					    p
					    }' >> newfile.html
        else 
            echo $LINE >> newfile.html
        fi
    else
        echo $LINE >> newfile.html
    fi
    
    # If we are leaving a table row the we need to reset the TD counter!
    if [ -n "$LINE" -a `echo $LINE |grep "</tr>"` != "" ]
        CT=0
    fi
done

But I have two questions regarding your script. What is the var TD for? Notice I've commented it out for now. Lastly, since you set CT to 0, on the -very first count it will be 0 not 1 correct?
Last edited by phpfreak; 12-05-2008 at 06:45 AM..
# 6  
Old 12-05-2008
OK I created a file named testHTM.txt with the following

Code:
$ cat testHTM.txt
<table>
<tr>
<td>x</td>
<td>y</td>
<td>z</td>
</tr>
</table>

then I ran this against that file

Code:
$ OUT=`cat testHTM.txt` && echo $OUT |sed 's/<td>[x-z]<\/td>//1'
<table> <tr>  <td>y</td> <td>z</td> </tr> </table>

$ OUT=`cat testHTM.txt` && echo $OUT |sed 's/<td>[x-z]<\/td>//2'
<table> <tr> <td>x</td>  <td>z</td> </tr> </table>

$ OUT=`cat testHTM.txt` && echo $OUT |sed 's/<td>[x-z]<\/td>//3'
<table> <tr> <td>x</td> <td>y</td>  </tr> </table>

Notice the setting of the occurance you wish to change at the end of the line... so setting to handle occurrence 1 removes the "<td>x</td>" and setting to handle occurrence 2 removes "<td>y</td>" and so on.

Placing this code inside a loop checking weather you are inside "<tr>" and "</tr>" tags and setting to handle occurrence 7 would do it.
# 7  
Old 12-05-2008
oops yeah TD was an extra that I never used so safe to comment/remove

and the CT question:

Code:
    if [ -n "$LINE" -a `echo $LINE |grep "<td>"` != "" ]
    then
        # Increase the TD counter by 1
        CT=`echo "$CT+1" |bc`
        
        # Check to see if the TD counter is at 6 (we are at 7th TD as the counter starts at 0 not 1)
        if [ "$CT" -eq 6 ]

You should change "-eq 6" to "-eq 7" as we increment before we test... again oops
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