Bash Shell Options

A POSIX compliant shell can be configured with the set and unset Bash/BuiltinCommands#Set builtins. To inspect the enabled options, use the $SHELLOPTS shell variable.

bash(1) expands on the set of configuration options. These options are set with the shopt builtin. To inspect the enabled options, use the $BASHOPTS shell variable.

Contents

  1. Bash Shell Options
    1. Compatibility Levels
    2. Extended Debugging Mode

Compatibility Levels

bash(1) version 4.0 introduced compatibility levels, wherein the behavior of the shell are modified. 

shopt -e compat31

The modes available through the shopt builtin are:

A shell only has one compatibility level, so each mode is mutually exclusive.

From bash(1) 4.3+, use of the $BASH_COMPAT shell variable is preferred.

Extended Debugging Mode

extdebug

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