How to grep for a backslash in a for loop statement
Hello everyone,
My main objective is to search for text within a file, namely a block of text where each line ends with a backslash "\".
However, the block must begin with a keyword, like "loginstring".
Here is an example of a file that contains a block:
Code:
###############
loginstring \
morestufff \
text \
no more text \n
###############
I would like to run a for loop through the file, line by line, and if i come across the keyword, see if the line ends in a backslash
here is the code I have now.
Code:
for line in `cat $file | /usr/xpg4/bin/grep -e $keyword -e \\\\`;do
if [ -n `echo $line | /usr/xpg4/bin/grep $keyword` ]; then
isBlock=1
fi
if [ ${line: -1} = "\\" ]; then
echo $line
fi
done
However, when i run the code above on the file, I get an error
"grep: RE error in \ trailing \ in pattern"
which I think has to do with the for loop syntax, since the
I'm trying to read the /usr/dt/config/C/Xresources file, specifically, the greeting.
The file looks like this
Code:
!!#########################################################
!!
!! Xresources
!!
!! Configuration file for the Login Manager
!!
...
...
Dtlogin*greeting.labelString: Hello! You are on %LocalHost% \n\n \
This computer is being monitored for all purposes. You will be responsible for \n \
all actions taken while logged in to this computer. Please make sure to \n \
Log out when you are finished with your session \n \
Have fun! \n
!! Dtlogin*greeting.persLabelString: Welcome %s
!! Dtlogin*greeting.alignmnet: ALIGNMENT_CENTER
!! ########################################################
!!
!! Size of Text Input Area
I just want to print out the "Dtlogin*greeting.labelString: " line and what it is set to.
So the output would be:
Code:
Dtlogin*greeting.labelString: Hello! You are on %LocalHost% \n\n \
This computer is being monitored for all purposes. You will be responsible for \n \
all actions taken while logged in to this computer. Please make sure to \n \
Log out when you are finished with your session \n \
Have fun! \n
I did find a workaround to that code i posted above. Instead of doing the grep inside the for loop, you grep and redirect output to a file, and loop over that file.
Here is the workaround:
Code:
file=/etc/dt/config/C/Xresources
tempfile=tmpfile.txt
keyword="Dtlogin\*greeting\.labelString:"
cat $file | /usr/xpg4/bin/grep -e "$keyword" -e \\\\ > $tempfile
for line in `cat $tempfile`; do
echo $line
done
rm $tempfile
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