touch /tmp/debug.log
LD_DEBUG=all LD_DEBUG_OUTPUT=/tmp/debug.log ls
After doing this I expect debug info to be written to the /tmp/debug.log
file, but it is empty.
Ubuntu 20.04
The LD_*
environment variables are described in the ld.so(8)
man page.
For LD_DEBUG_OUTPUT
, it says:
LD_DEBUG_OUTPUT (since glibc 2.1)
By default,
LD_DEBUG
output is written to standard error. IfLD_DEBUG_OUTPUT
is defined, then output is written to the pathname specified by its value, with the suffix "." (dot) followed by the process ID appended to the pathname.
So, if you ran the commands you specified in your question, and the process ID (PID) of the ls
command happened to be 12345, then the output would be in a file named /tmp/debug.log.12345
.
all
option. TryLD_DEBUG=help ls
, as the Oracle (Solaris) version documentation does not even showall
as an option. It is also possible (for example) that yourls
is being found in BusyBox, which may be statically linked, so try a different command, likestat
./tmp/debug.log
as empty, or reported it was empty when it was actually not found?