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Old 02-03-2015, 04:00 PM   #1
weezy99
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Registered: Feb 2015
Posts: 2

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Question Tips on using bash script to edit a windows text file


I have a bash script executing on an AIX server to a windows share directory to update a windows text file. Most of the file is edited as expected but I have 3 issues that I am not sure how to resolve.

1. Windows text file contains a double backslash (\\) and the \\ is being written back as a single \ which corrupts the file.
2. I am not getting the last line of text in the file written back out.
3. Some lines of text are not written back out completely.

Here is a snippet of my bash script:
cp $Directory/Somefile $Directory/Somefile.$(date +'%Y%m%d')
cat /dev/null > ${HOME}/temp.out

while read -r inpLine; do
patternFound=n
echo ${inpLine} | grep -q 'SOMEPATTERN='
if [ $? = 0 ]; then
patternFound=y
echo "##${inpLine}" >> ${HOME}/temp.out
echo "SOMEPATTERN=newValue" >> ${HOME}/temp.out
fi

if [ ${patternFound} = "n" ]; then
echo ${inpLine} >> ${HOME}/temp.out
fi

done < $Directory/Somefile
mv ${HOME}/temp.out $Directory/Somefile
 
Old 02-03-2015, 04:51 PM   #2
unSpawn
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Quote:
Originally Posted by weezy99 View Post
1. Windows text file contains a double backslash (\\) and the \\ is being written back as a single \ which corrupts the file.
In UNIX the backslash is one of the escape chars so if you need one as literal backslash you have to escape it:
Code:
 ~]$ echo "\\\\"
\\
 ~]$ echo "\\\\\\"
\\\

Quote:
Originally Posted by weezy99 View Post
2. I am not getting the last line of text in the file written back out.
Might be a line ending issue?


Quote:
Originally Posted by weezy99 View Post
3. Some lines of text are not written back out completely.
Running your script with the appropriate verbose, trace and or debug switches for your shell will help you understand how lines are executed.
 
Old 02-03-2015, 05:46 PM   #3
jlinkels
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Maybe a stupid idea, but running dos2unix on the file before editing the file and unix2dos afterwards might solve some compatibility problems.

Awk is better suited for this task, but if this project is only one of a kind it might not be worth the effort to learn it.

And please post code snippets in [.CODE][./CODE] tags.

jlinkels
 
Old 02-11-2015, 08:09 AM   #4
weezy99
LQ Newbie
 
Registered: Feb 2015
Posts: 2

Original Poster
Rep: Reputation: Disabled
Sorry I am new to forum and didn't read the rules about how to appropriately post code snippets. Also very new to AIX/Linux and bash.
The resolution to my issue was to change from echo approach to sed and handle the special characters.
 
  


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