Programmatically edit configuration files with JSON expressions
patchcfg [-hvpo] file [patch-expr]
Command line switches:
-v : verbose
-h, --help : help
-p [parser] : specify a parser to use
-o [file] : output to a different file (or - for stdout) instead of edit-in-place
file : The configuration file to patch
patch-expr : JavaScript expression for object with values to edit
Available parsers: etc_hosts, postgresql.conf