Section 29.1: 使用函数简单补全

_mycompletion() {
local command_name="$1" # not used in this example
local current_word="$2"
local previous_word="$3" # not used in this example
# COMPREPLY 是一个数组，必须填入可能的补全内容 compgen 用于过滤匹配的补全
COMPREPLY=( $(compgen -W 'hello world' -- "$current_word") )
}
complete -F _mycompletion mycommand

使用示例：

$ mycommand [TAB][TAB]
hello world
$ mycommand h[TAB][TAB]
$ mycommand hello

Section 29.2: 简单补全选项和文件名

# The following shell function will be used to generate completions for
# the "nuance_tune" command.
_nuance_tune_opts ()
{
    local curr_arg prev_arg
    curr_arg=${COMP_WORDS[COMP_CWORD]}
    prev_arg=${COMP_WORDS[COMP_CWORD-1]}

    # The "config" option takes a file arg, so get a list of the files in the
    # current dir. A case statement is probably unnecessary here, but leaves
    # room to customize the parameters for other flags.
    case "$prev_arg" in
        -config)
        COMPREPLY=( $( /bin/ls -1 ) )
        return 0
        ;;
    esac

        \# Use compgen to provide completions for all known options.
        COMPREPLY=( $(compgen -W '-analyze -experiment -generate_groups -compute_thresh -config -output
-help -usage -force -lang -grammar_overrides -begin_date -end_date -group -dataset -multiparses -
dump_records -no_index -confidencelevel -nrecs -dry_run -rec_scripts_only -save_temp -full_trc -
single_session -verbose -ep -unsupervised -write_manifest -remap -noreparse -upload -reference -
target -use_only_matching -histogram -stepsize' -- $curr_arg ) );
}

# The -o parameter tells Bash to process completions as filenames, where applicable.

complete -o filenames -F _nuance_tune_opts nuance_tune