Search notes:

/proc/self/fd

/dev/fd/ is a symlink to /proc/self/fd. The files under /proc/self/fd are (always or likely?) symlinks also: 
$ ls -l /dev/fd
lrwxrwxrwx 1 root root 13 Feb  3  2024 /dev/fd -> /proc/self/fd

$ ls -l /proc/self/fd/*
ls: cannot access '/proc/self/fd/255': No such file or directory
ls: cannot access '/proc/self/fd/3': No such file or directory
lrwx------ 1 rene rene 64 Feb  3 16:42 /proc/self/fd/0 -> /dev/pts/2
lrwx------ 1 rene rene 64 Feb  3 16:42 /proc/self/fd/1 -> /dev/pts/2
lrwx------ 1 rene rene 64 Feb  3 16:42 /proc/self/fd/2 -> /dev/pts/2

See also

/proc/self

Index

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/Linux/fh...', 1738302509, '18.217.70.106', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/Linux/fhs/proc/self/fd/index(45): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78