Guida avanzata di scripting Bash - Portale Posta DMI

#### Special IFS settings used for string parsing. ####
# Whitespace == :Space:Tab:Line Feed:Carriage Return:
WSP_IFS=$’\x20’$’\x09’$’\x0A’$’\x0D’
# No Whitespace == Line Feed:Carriage Return
NO_WSP=$’\x0A’$’\x0D’
# Field separator for dotted decimal IP addresses
ADR_IFS=${NO_WSP}’.’
# Array to dotted string conversions
DOT_IFS=’.’${WSP_IFS}
# # # Pending operations stack machine # # #
# This set of functions described in func_stack.bash.
# (See "Additional documentation" above.)
# # #
# Global stack of pending operations.
declare -f -a _pending_
# Global sentinel for stack runners
declare -i _p_ctrl_
# Global holder for currently executing function
declare -f _pend_current_
# # # Debug version only - remove for regular use # # #
#
# The function stored in _pend_hook_ is called
# immediately before each pending function is
# evaluated. Stack clean, _pend_current_ set.
#
# This thingy demonstrated in pend_hook.bash.
declare -f _pend_hook_
# # #
# The do nothing function
pend_dummy() { : ; }
# Clear and initialize the function stack.
pend_init() {
unset _pending_[@]
pend_func pend_stop_mark
_pend_hook_=’pend_dummy’ # Debug only.
}
# Discard the top function on the stack.
pend_pop() {
if [ ${#_pending_[@]} -gt 0 ]
then
Appendice A. Script aggiuntivi
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