How many files cause this error?

It depends on filename length. With 100-character paths, roughly 20,000 files can hit the ~2MB ARG_MAX limit.

Does this affect shell built-ins?

No, built-ins like echo or printf run inside the shell process without execve(). Only external commands are affected.

Linux E2BIG (errno 7) — Argument List Too Long

Warningerrno

Overview

Linux E2BIG error occurs when the combined size of program arguments and environment variables exceeds the kernel's ARG_MAX limit, commonly with glob expansions.

Key Details

E2BIG (errno 7) means the total size of arguments + environment exceeds ARG_MAX
Default ARG_MAX on modern Linux is approximately 2MB (varies by kernel version)
Most commonly triggered by shell glob expansion: rm /path/to/dir/* with thousands of files
Both command-line arguments and environment variables count toward the limit
The limit applies to the execve() system call, not to shell built-in commands

Common Causes

Shell glob (wildcard) expanding to thousands of file names
Very large environment (many or large environment variables)
Script passing too many arguments to a command
find ... -exec command {} + accumulating too many file arguments
xargs without -n limit passing all input as one command

Steps

1Use find with -exec and \; (one at a time) instead of +: find /path -name '*.log' -exec rm {} \;
2Use xargs with batching: find /path -name '*.log' -print0 | xargs -0 -n 100 rm
3Use a for loop: for f in /path/to/dir/*; do rm "$f"; done
4Check ARG_MAX: getconf ARG_MAX
5Reduce environment size: env -i command runs with minimal environment