Guida avanzata di scripting Bash - Portale Posta DMI

Appendice A. Script aggiuntivi
shift 2
eval "eval \"\$${Hash_config_varname_prefix}${hash}_${key} \\\"\\\$@\\\"\""
}
# Emulates something similar to: isset(hash[key]) or hash[key]==NULL
#
# Params:
# 1 - hash
# 2 - key
# Returns:
# 0 - there is such key
# 1 - there is no such key
function hash_is_set {
eval "if [[ \"\${${Hash_config_varname_prefix}${1}_${2}-a}\" = \"a\" &&
\"\${${Hash_config_varname_prefix}${1}_${2}-b}\" = \"b\" ]]; then return 1; else return 0; f
}
# Emulates something similar to:
# foreach($hash as $key => $value) { fun($key,$value); }
#
# It is possible to write different variations of this function.
# Here we use a function call to make it as "generic" as possible.
#
# Params:
# 1 - hash
# 2 - function name
function hash_foreach {
local keyname oldIFS="$IFS"
IFS=’ ’
for i in $(eval "echo \${!${Hash_config_varname_prefix}${1}_*}"); do
keyname=$(eval "echo \${i##${Hash_config_varname_prefix}${1}_}")
eval "$2 $keyname \"\$$i\""
done
IFS="$oldIFS"
}
# NOTE: In lines 103 and 116, ampersand changed.
# But, it doesn’t matter, because these are comment lines anyhow.
Ecco un script che utilizza la precedente libreria.
Esempio A-22. Colorare del testo con le funzioni di hash
#!/bin/bash
# hash-example.sh: Colorizing text.
# Author: Mariusz Gniazdowski
. Hash.lib # Load the library of functions.
hash_set colors red "\033[0;31m"
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