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Full Discussion: Shell script to read specified value from file and echo to the same location to other file.
Top Forums Shell Programming and Scripting Shell script to read specified value from file and echo to the same location to other file. Post 302915217 by MadeInGermany on Monday 1st of September 2014 04:08:35 PM
Old 09-01-2014
Change your awk backup so it saves the rest of the default: line
Code:
awk '/default:/ {sub (/.*default/,""); sub (/,.*/,","); print}' config.json >def

Or with sed
Code:
sed '/default:/!d; s/.*default//; s/,.*/,/' config.json >def

And restore with the following shell script
Code:
while read line
do
  case $line in
  *default:*)
    read replace <&3
    echo "$line" | sed 's/\(.*default\)[^,]*\(.*\)/\1'"$replace"'/'
  ;;
  *)
    echo "$line"
  esac
done < config.json 3< def > config.json.new
# mv config.json.new config.json

---------- Post updated at 03:08 PM ---------- Previous update was at 02:48 PM ----------

I didn't see Junior's proposal. Storing the whole line is most efficient!
And missed Scrutinizer's post. Go for that one!
This User Gave Thanks to MadeInGermany For This Post:
ausdim
 

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LEARN ABOUT CENTOS

targetctl

targetctl(8)						      System Manager's Manual						      targetctl(8)

NAME

       targetctl - Save and restore configuration of kernel target

DESCRIPTION

       targetctl  is  a  low-level script to save and restore the configuration of the LIO kernel target, to and from a file in json format. It is
       not normally meant to be used by end-users directly, but by system init frameworks, or advanced end-users who are generating the configura-
       tion file themselves and need a way to load the configuration without relying on the targetcli configuration shell.

USAGE

       targetctl must be invoked as root. Exit status will be 0 if successful, or nonzero if an error was encountered.

       targetctl save [config-file]

       Saves  the  current configuration of the kernel target to a file in json format. Since the file may contain cleartext passwords, the file's
       permissions will be set to only allow root access. If config-file is not supplied, targetctl will use the default file location,  /etc/tar-
       get/saveconfig.json.

       targetctl restore [config-file]

       Removes	any  existing configuration and replaces it with the configuration described in the file. See saveconfig.json(5) for more details.
       If parts of the configuration could not be restored, those parts will be noted in the error output, and the rest of the configuration  will
       still be applied.

       targetctl clear

       Removes any existing configuration from the running kernel target.

       targetctl --help

       Displays usage information.

SEE ALSO

       targetcli(8), targetd(8), saveconfig.json(5)

FILES

       /etc/target/saveconfig.json

       /sys/kernel/config/target

AUTHOR

       Written by Andy Grover <agrover@redhat.com>.
       Man page written by Andy Grover <agrover@redhat.com>.

REPORTING BUGS

       Report bugs via <targetcli-fb-devel@lists.fedorahosted.org>
       or <https://github.com/agrover/rtslib-fb/issues>

																      targetctl(8)
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