数组 – 当使用结果填充数组时,Bash,奇怪的变量范围

工作正常,直到退出内循环 – 输出数组为空.

declare -a KEYS

#-----------------------------------------------------------------------------#
get_keys()
{

# this extracts key NAMES from log in format "timestamp keycode"
$glue_dir/get_keys $ip | while read line; do
    echo line: $line
    set -- $line # $1 timestamp $2 keycode
    echo 1: $1 2: $2
    key=(`egrep "s$2$" "$glue_dir/keycodes"`) # tested for matching '40' against 401,402 etc
    set -- $key # $1 key name $2 keycode
    KEYS+=("$1")
    echo key $1
    echo KEYS inside loop: "${KEYS[@]}"
done
    echo KEYS outside loop: "${KEYS[@]}"
}

输出时再次运行两条输出行：

line: 1270899320451 38
1: 1270899320451 2: 38
key UP
KEYS inside loop: UP
line: 1270899320956 40
1: 1270899320956 2: 40
key DOWN
KEYS inside loop: UP DOWN
KEYS outside loop:

我花了一个小时试图弄清楚这一点.请帮忙.

（编辑：李大同）

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