File descriptor

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wikipedia:File descriptor

• cat /proc/sys/fs/file-nr
• cat /proc/sys/fs/file-max

echo "" > "/proc/$pid/fd/$fd"

0 stdin
1 stdout
2 stderr

Open YOUR_FILE_TO_READ as file descriptor 3 for reading:
exec 3< YOUR_FILE_TO_READ

file descriptor 2342543535 out of range

Related terms

• Zabbix agent file descriptor monitorization
• inode
• Python: os.close(fd)
• Resource starvation
• sysctl fs.file-max

2>&1

See also

• /dev/stdin, /dev/stdout, /dev/stderr, /dev/null, File descriptor, set -x
• file, File system, directory, touch, mkdir, ls, ln truncate, fallocate, split, stat, inode, File descriptor, superblock, block size (blockdev), fuser, lsof, scrub, chattr, ulimit (nofiles), cp, mv, file (command), mkfifo, chmod