Search notes:

/proc/$pid/fd/

My process

$ ls -l /proc/$$/fd
total 0
lrwx------ 1 rene rene 64 Nov 14 07:33 0 -> /dev/pts/0
lrwx------ 1 rene rene 64 Nov 14 07:33 1 -> /dev/pts/0
lrwx------ 1 rene rene 64 Nov 14 07:33 2 -> /dev/pts/0
lrwx------ 1 rene rene 64 Nov 14 07:33 255 -> /dev/pts/0

Another process

Another process (I believe an SQLite shell): 
$ ls -l /proc/164495/fd
total 0
lrwx------ 1 rene rene 64 Jun 10 06:06 0 -> /dev/pts/4
l-wx------ 1 rene rene 64 Jun 10 06:06 1 -> 'pipe:[2100913]'
lrwx------ 1 rene rene 64 Jun 10 06:06 2 -> /dev/pts/4
lrwx------ 1 rene rene 64 Jun 10 06:06 3 -> /home/rene/helloWorld.db
lrwx------ 1 rene rene 64 Jun 10 06:06 4 -> '/var/tmp/etilqs_b6690f68aa03e47f (deleted)'

See also

/proc/$pid

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