confix

install

Grab the latest released script (branch-independent), make it executable:

curl -kL https://github.com/budhash/confix/releases/latest/download/confix > confix
chmod +x confix

options

• -finput file (or -f - / omit to read stdin)
• -ooutput file; -o- prints to stdout, leaving the input untouched
• -ddry run — print a unified diff, write nothing
• -eread commands from a file (one per line)
• -sseparator character (default =)
• -ccomment character (default #)

example

# update a port, enable a flag, comment one out, add a timeout
confix -f app.properties "port=9090" ">debug=true" "<log.level" ">timeout=30"

commands

Each argument (or each line of a -e file) is one command; the first character selects the operation. Key/value split on the first =, independent of the file separator.

key=value	update an existing key (no-op if the key is absent)
>key=value	set the key, appending it to the file if absent
>key	uncomment an existing key
<key	comment out an existing key (the line is kept)
!key	delete the key's line entirely (active or commented)

More examples and the full reference are in the README.