Issue
I'd like a simple one liner with sed to update a java property value. Without knowing what the current setting of the java property is, and it may be empty)
before
example.java.property=previoussetting
after
example.java.property=desiredsetting
Solution
Assuming Linux Gnu sed, 1 solution would be
Edits escaped '.' chars i.e. s/example\.java.../ per correct comment by Kent
replaceString=desiredsetting
sed -i "s/\(example\.java\.property=\).*\$/\1${replaceString}/" java.properties
If you're using BSD sed on a Mac for instance, you'll need to supply an argument to the -i to indicate the backup filename. Fortunately, you can use
sed -i '' "s/\(example\.java\.property=\).*\$/\1${replaceString}/" java.properties
as an argument, and avoid having to manage .bak files in your workflow. (BSD sed info added 2018-08-10)
If your sed doesn't honor the -i, then you have to manage tmp files, i.e.
sed "s/\(example\.java\.property=\).*\$/\1${replaceString}/" java.properties > myTmp
/bin/mv -f myTmp java.properties
I hope this helps.
Answered By - shellter Answer Checked By - Katrina (WPSolving Volunteer)