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Old 12-12-2010, 04:55 PM   #1
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Registered: Dec 2010
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bash giving me trouble again

Sorry to be a pain twice a day

I read a file line by line (lines are
add_item_tabulky("Prasátko-Šťastný nový rok","prasatko_stastny_novy_rok.jpg","","","");
add_item_tabulky("Svatá rodina","rodina.jpg","","","");
add_item_tabulky("Sněhulák před domem","snehulak2.jpg","","","");

and when I want to replace a part of the line it isnt working!

while read line
line=$line|sed "s/\");//"
echo $line
done << file.php
I would expect the result to be :
add_item_tabulky("Sněhulák před domem","snehulak2.jpg","","","
(missing the "): in the end... but it doesnt happen.. Why is that?

the line doesnt get changed... I am guessing it has something to do with double quotes cause when I do

echo "\"\");"|sed "s/\");//"
the result is (as I expect)--> "
I tried doing echo $line|sed "s/\");//" but it dies with command not found (the quotes arent escaped and echo cant handle it)

thanks for help
Old 12-12-2010, 05:35 PM   #2
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Try (untested):

line=$(echo $line | sed "s/\");//")
Old 12-12-2010, 06:00 PM   #3
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Registered: Sep 2003
Location: Bologna
Distribution: CentOS 6.5 OpenSuSE 12.3
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The double input redirection << is the syntax for here documents so that the shell expect some text terminated by the keyword following <<. Said that, you can simply try parameter substitution as in:
while read line
  echo ${line/\");/}
done < file.php
or eventually use single quotes to embed the sed command and avoid confusion:
while read line
  line=$(echo $line | sed 's/");//')
  echo $line
done < file.php
Old 12-12-2010, 06:10 PM   #4
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And now for something completely different.

Section entitled:

Deletes longest match of $substring from back of $string.
I got this modified version of the program to work ... finally.

while read line
echo line is $line
echo line2 is $line2
done < test.tmp
Note that my test.tmp has only got one line of data.

@koszta5: I started working on your problem as soon as it appeared in LQ spy with no replies so I worked on it for 1 hour and 15 minutes. I struggled with sed for a long time. Then I looked up string manipulation on Google. It showed me the link at TLDP. A little reading, a little experimenting, and I got it. The documentation is a bit confusing because they show two percent signs in the function but it only wants one percent sign between the parameters. The example code on that page set me straight.

Moral: Don't give up but do look at alternative approaches to solving a problem.

Last edited by stress_junkie; 12-12-2010 at 06:26 PM.


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