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Shell Programming and Scripting

function to test if file is open

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# 1  
Old 03-09-2006
function to test if file is open
I need to write a function that will work in sh/ksh shell that will test to see if a file has already been opened for writting by another user

has anyone written something like this?
# 2  
Old 03-09-2006
by the way - i don't have execute permissions on fuser and lsof not on system
# 3  
Old 03-10-2006
i think you can also do it using the "test -t" but can't seem to figure out the syntax - has anyone done this?
# 4  
Old 03-10-2006
test -t is used to test if a file descriptor is pointing to a tty device:

if [ -t 0 ] ; then
echo this will go to a tty
fi

It is one of the few things that a double bracket test cannot do. fuser and lsof are the only programs that can do this. If you don't have lsof, get it. Or live without the capability.
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