How do I use the linux flock command to prevent another root process from deleting a file?

Question

I would like to prevent one of my root processes from deleting a certain file. So I came across the flock command, it seems to fit my need, but I didn\'t get its syntax.

Answer 1

sudo chattr +i ./file.xml

MarkR is correct chattr'ing the file will prevent it from being deleted:

-(~)-------------------------------------------------------------------------------------------------------(08:40 Mon Mar 29)
risk@DockMaster [2135] --> sudo chattr +i junk.txt
[sudo] password for risk: 
-(~)-------------------------------------------------------------------------------------------------------(08:40 Mon Mar 29)
risk@DockMaster [2136] --> sudo rm ./junk.txt 
rm: cannot remove `./junk.txt': Operation not permitted
zsh: exit 1     sudo rm ./junk.txt
-(~)-------------------------------------------------------------------------------------------------------(08:40 Mon Mar 29)
risk@DockMaster [2137] --> sudo rm -f ./junk.txt
rm: cannot remove `./junk.txt': Operation not permitted
zsh: exit 1     sudo rm -f ./junk.txt
-(~)-------------------------------------------------------------------------------------------------------(08:40 Mon Mar 29)
risk@DockMaster [2138] -->