Is there an automatic way to add group read permissions to “nohup.out” when “nohup” is run?

Question

I run my Java code from bash script using a command like this:

exec nohup "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" com.myClass "$@" &

Which creates the output file nohup.out and this file has permissions like this:

-rw------- 1  24308657 Mar 24 12:52 nohup.out

I want the group to have read permission as well, not only the user that ran the command.

How do I do this?

Answer 1

You could add a permissions change in your command by using the “and” operator (&&) like this:

exec nohup "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" com.myClass "$@" && chmod g+r nohup.out &

Answer 2

Create the nohup.out file before you run nohup. If necessary, give it the correct permissions when you create it.

touch nohup.out && nohup seq 1

Which would then create the file with your default permissions before nohup is actually run:

-rw-r--r-- 1 rici rici 6 Mar 25 14:57 nohup.out

nohup would then append it’s output to that nohup.out file.

Answer 3

Can you change the permissions the normal way?

chmod g+r nohup.out