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`bash(1)` version 4.0 introduced '''compatibility levels''', wherein the behavior of the shell are modified. `bash(1)` 4 introduced '''compatibility levels''', wherein the behavior of the shell are modified.

Bash Shell Options

A POSIX compliant shell can be configured with the set and unset 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 builtins. 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) 4 introduced compatibility levels, wherein the behavior of the shell are modified. 

shopt -e compat31

The modes available through the shopt builtin are:

  • compat31

  • compat32

  • compat40

  • compat41

  • compat42

  • compat43

  • compat44

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

CategoryRicottone

Bash/ShellOptions (last edited 2023-04-03 03:07:16 by DominicRicottone)