bash-opts.md

Options

Set shell options using set and shopt

set

[GNU bash set builtin documentation]

usage

# Set/unset xtrace
set -x  # set
set +x  # unset

# Set/unset xtrace by option name
set -o xtrace  # set
set +o xtrace  # unset

options

• ±x, ±o xtrace: Print all executed commands
• ±e, ±o errexit: Exit on first non-zero exit code
• ±o pipefail: Use last failed pipe-command exit code as exit code

shopt

[GNU bash shopt builtin documentation]

# list options
shopt

# set option
shopt -s <option>

# unset option
shopt -u <option>

# query option
shopt -q <option> && echo "set" || echo "unset"