[SOLVED] awk or sed help

cli · 03-04-2015, 05:37 AM

Hi All,
How can I replace the particular word using sed or awk

Code:

$ BUGZILLAURL="https://mylocalserver.com/bugzilla"
$ PROJECTNAME="mybugs"
$ echo "$BUGZILLAURL/$PROJECTNAME" 
https://mylocalserver.com/bugzilla/mybugs

There is a urlbase line in data/params file which has an empty variable, pls see 2nd line from below command's output.

Code:

$ grep -i "urlbase" data/params 
           'docs_urlbase' => 'docs/%lang%/html/',
           'urlbase' => '',
           'webdotbase' => 'http://www.research.att.com/~north/cgi-bin/webdot.cgi/%urlbase%',

Or search only for that line which I wanted to be as 'urlbase' => 'https://mylocalserver.com/bugzilla/mybugs',

Code:

$ grep -i "'urlbase'" data/params 
           'urlbase' => '',

So expecting your kind help to replace '' word with 'https://mylocalserver.com/bugzilla/mybugs' using sed or awk.

Thanks.

veerain · 03-04-2015, 05:57 AM

Set the variables you need then run:

Code:

sed -i -e "/^'urlbase'/s@''@'$BUGZILLAURL/$PROJECTNAME'@g" data/params

veerain · 03-04-2015, 06:00 AM

You should read learn and build up self capability to use sed.

Read info pages of sed. That is the official documentation about sed. It has also examples.

Run:

Code:

info sed

cli · 03-04-2015, 07:11 AM

Quote:

Originally Posted by veerain

Set the variables you need then run:

Code:

sed -i -e "/^'urlbase'/s@''@'$BUGZILLAURL/$PROJECTNAME'@g" data/params

Thanks for the reply Sir,
I ran the above command after setting the variables but it did not append the entry(https://mylocalserver.com/bugzilla/mybugs) to urlbase variable line in the data/params file.

Code:

# echo "$BUGZILLAURL/$PROJECTNAME" 
https://mylocalserver.com/bugzilla/mybugs
# sed -i -e "/^'urlbase'/s@''@'$BUGZILLAURL/$PROJECTNAME'@g" data/params
# echo $?
0
# grep -i "'urlbase'" data/params
           'urlbase' => '',
#

Am I missing anything? Kindly suggest and expecting your kind reply.

grail · 03-04-2015, 09:55 AM

^ implies the string being searched for ('urlbase') is at the start of the line, is this the case?

Also, you have been given an example, try and work with it as opposed to just trying the given solution verbatim and then saying it doesn't work.

grail · 03-04-2015, 09:55 AM

^ implies the string being searched for ('urlbase') is at the start of the line, is this the case?

Also, you have been given an example, try and work with it as opposed to just trying the given solution verbatim and then saying it doesn't work.

veerain · 03-04-2015, 11:32 PM

Try this instead:

Code:

sed -i -e "/'urlbase'/s@''@'$BUGZILLAURL/$PROJECTNAME'@g" data/params

or this:

Code:

sed -i -e "/^[[:space:]]\+'urlbase'/s@''@'$BUGZILLAURL/$PROJECTNAME'@g" data/params

or this:

Code:

sed -i -e "/'urlbase'/s@''@'$BUGZILLAURL/$PROJECTNAME'@g" data/params

And refer to info pages of sed to modify appropriately.

cli · 03-05-2015, 12:43 AM

Quote:

Originally Posted by veerain

Try this instead:

Code:

sed -i -e "/'urlbase'/s@''@'$BUGZILLAURL/$PROJECTNAME'@g" data/params

or this:

Code:

sed -i -e "/^[[:space:]]\+'urlbase'/s@''@'$BUGZILLAURL/$PROJECTNAME'@g" data/params

or this:

Code:

sed -i -e "/'urlbase'/s@''@'$BUGZILLAURL/$PROJECTNAME'@g" data/params

And refer to info pages of sed to modify appropriately.

Excellent SED master, all the above 3 commands worked nicely. Thanks a lot for this great help.