shell IFS

在bash中IFS是内部的域分隔符，manual中对其的叙述如下：
IFS The Internal Field Separator that is used for word splitting after expansion and to split lines into words with the read builtin command. The default value is ''.

#!/bin/sh
IFS="#"
p_commands="./sh01.sh#./sh05.sh"
for w in $p_commands
do
    eval "$w"
done

会本别执行sh01和sh02

如果#IFS="#"，运行报错