Issue
The problem is that my app tries to add a line to an existing xml file in /system/csc
.
I need a function to check if inside the file there is X line and if it is in there the line shouldn't be added also it has to put the line before another line that is present in the file.
Solution
You can check whether the line already exist with grep
and use sed
to insert it if not:
grep -Fxq "foobar line" file || sed -i '/^context line$/i foobar line' file
This will insert the line foobar line
before the line context line
if foobar line
isn't already found in the file.
Alternately you could do it all with sed
:
sed -i '/^foobar line$/d;/^context line$/i foobar line' file
Answered By - Chris Seymour
Answer Checked By - Candace Johnson (JavaFixing Volunteer)