grep for a backslash as for loop parameter Post: 302538010

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Top Forums UNIX for Dummies Questions & Answers grep for a backslash as for loop parameter Post 302538010 by idlechatter on Monday 11th of July 2011 12:37:14 PM

07-11-2011

Registered User

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

idlechatter

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LEARN ABOUT FREEBSD

apropos

APROPOS(1)						    BSD General Commands Manual 						APROPOS(1)

NAME

     apropos, whatis -- keyword search whatis documentation databases

SYNOPSIS

     apropos [-d] keyword ...
     whatis [-d] keyword ...

DESCRIPTION

     The apropos utility searches a set of databases looking for documentation matching each keyword and displays the results.	The whatis utility
     does the same search but only on complete words.

     -d  Print extra debugging information.

     The keyword is simply passed to grep(1) allowing for extended regular expression matches.

ENVIRONMENT

     The following environment variables affect the execution of apropos:

     MANLOCALES, MANPATH, PATH
	    Used to find the location of the whatis database files. See manpath(1) for additional information.

     PAGER  Program used to display files.  If unset, more -s is used.

DIAGNOSTICS

     The apropos utility exits 0 if a keyword matched and 1 if no keywords are matched or no whatis databases are found.

SEE ALSO

     grep(1), makewhatis(1), man(1), manpath(1), man.conf(5)

BSD
								 September 1, 2010							       BSD

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apropos