Same as dash; bash, ksh and zsh use 1.

Same as dash and ksh; bash and zsh use 1.

Specified by POSIX.

Status codes returned by the shell itself.

Same as dash; bash, ksh and zsh use 1.

Same as dash; bash and ksh use 1, zsh uses 127 (same as command not found).

Dash and zsh use 127 (same as command not found); bash and ksh use 1.

Same as dash and bash (when POSIXLY_CORRECT=1), which treat this error as a syntax error.

Status codes returned by the shell itself.

Relatively rare error conditions.

Same as dash; bash, ksh and zsh use 1.

Status codes returned by the shell itself.

Status codes returned by the shell itself.

Status codes returned by the shell itself.

Same as dash and bash; ksh uses 3, zsh uses 1.

Status codes returned by the shell itself.

Status codes returned by the shell itself.