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Full Discussion: sed - How to insert line before the first blank line following a token
Top Forums Shell Programming and Scripting sed - How to insert line before the first blank line following a token Post 302881367 by disedorgue on Saturday 28th of December 2013 04:32:50 PM
Old 12-28-2013
Code:
$ echo $MY_FILE
beforeblank.conf
$ echo $MY_TOKEN
media_dir
$ echo $MY_PARAMETER_VALUE
media_dir = /srv/media/my_personal_new_data

Code:
$ cat $MY_FILE
#
# port for HTTP (descriptions, SOAP, media transfer) traffic
port=8200

# network interfaces to serve, comma delimited
network_interface=eth0

# set this to the directory you want scanned.
# * if have multiple directories, you can have multiple media_dir= lines
# * if you want to restrict a media_dir to a specific content type, you
#   can prepend the type, followed by a comma, to the directory:
#   + "A" for audio  (eg. media_dir=A,/home/jmaggard/Music)
#   + "V" for video  (eg. media_dir=V,/home/jmaggard/Videos)
#   + "P" for images (eg. media_dir=P,/home/jmaggard/Pictures)
#media_dir=V,/srv/media/film
#media_dir=A,/srv/media/musique
#media_dir=P,/srv/media/photo
#media_dir = /home/some_user/my_personal_old_data

# set this if you want to customize the name that shows up on your clients
friendly_name=SJL DLNA Server MY_SERVER OPENSUSE 13.1

Code:
$ sed -e "/$MY_TOKEN/,/^[[:blank:]]*$/{" -e "\|^[[:blank:]]*$|s|.*|${MY_PARAMETER_VALUE}\n&|g" -e "}" $MY_FILE
#
# port for HTTP (descriptions, SOAP, media transfer) traffic
port=8200

# network interfaces to serve, comma delimited
network_interface=eth0

# set this to the directory you want scanned.
# * if have multiple directories, you can have multiple media_dir= lines
# * if you want to restrict a media_dir to a specific content type, you
#   can prepend the type, followed by a comma, to the directory:
#   + "A" for audio  (eg. media_dir=A,/home/jmaggard/Music)
#   + "V" for video  (eg. media_dir=V,/home/jmaggard/Videos)
#   + "P" for images (eg. media_dir=P,/home/jmaggard/Pictures)
#media_dir=V,/srv/media/film
#media_dir=A,/srv/media/musique
#media_dir=P,/srv/media/photo
#media_dir = /home/some_user/my_personal_old_data
media_dir = /srv/media/my_personal_new_data

# set this if you want to customize the name that shows up on your clients
friendly_name=SJL DLNA Server MY_SERVER OPENSUSE 13.1

Last line of file must a blank line.
To modified directly the file, you can use -i option if your sed support.
You just create a function that call this type de sed command.
Regards.
This User Gave Thanks to disedorgue For This Post:
jcdole
 

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LEARN ABOUT SUSE

removable-media

removable-media(9P)					   Kernel Properties for Drivers				       removable-media(9P)

NAME

       removable-media - removable media device property

DESCRIPTION

       A  device  that	supports  removable  media--such  as CDROM, JAZZ, and ZIP drives--and that supports power management and expects automatic
       mounting of the device via the volume manager should export the boolean (zero length) property removable-media. This property  enables  the
       system to make the power state of the device dependent on the power state of the frame buffer and monitor. See the power.conf(4) discussion
       of the device-dependency-property entry for more information.

       Devices that behave like removable devices (such as PC ATA cards, where the controller and media both are removed at the same time)  should
       also export this property.

EXAMPLES

       Example 1: removable-media Entry

       An example of a removable-media entry from the .conf file of a driver is shown below.

       # This entry keeps removable media from being powered down unless
       # the console framebuffer and monitor are powered down
       #
       removable-media=1;

       Example 2: Implementation in attach()

       Below is an example of how the entry above would be implemented in the attach(9E) function of the driver.

       xxattach(dev_info_t *dip, ddi_attach_cmd_t cmd)
	    {
	    ...
		 if (ddi_prop_create(DDI_DEV_T_NONE, dip, DDI_PROP_CANSLEEP,
		     "removable-media", NULL, 0)) != DDI_PROP_SUCCESS)
		      goto failed;
	    ...
	    }

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       power.conf(4), pm(7D), attach(9E), detach(9E), ddi_prop_create(9F)

       Writing Device Drivers

SunOS 5.10							    15 Jun 2001 					       removable-media(9P)
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