Emacs eshell 'ulimit' command

Question

why i could not find ulimit command in esehll mode but M-x ansi-term had not this problem. how could i fix it.

like this:

~ $ ulimit -c
ulimit: command not found
~ $

Answer 1

ulimit is a shell-builtin and not a binary. ansi-term uses your normal shell (bash, zsh, or whatever you are using) while eshell is a shell of its own, and it does not seem to implement ulimit.