理解shell while 的例子

echo 
echo
echo
TESTACTION="mklichee;xcv;hhh;";
echo "TESTACTION List: ${TESTACTION}"
echo

echo start loop:
while [ -n "${TESTACTION}" ]; do
    act=${TESTACTION%%;*};
    #删掉第一个';'及其右边的所有字符串
    echo "Execute command: ${act}"
    TESTACTION=${TESTACTION#*;};
    #删掉第一个';'及其左边的字符串
    echo "TESTACTION List: ${TESTACTION}"
    
done
echo end loop!!!
echo
 

运行结果:

TESTACTION List: mklichee;xcv;hhh;

start loop:
Execute command: mklichee
TESTACTION List: xcv;hhh;
Execute command: xcv
TESTACTION List: hhh;
Execute command: hhh
TESTACTION List: 
end loop!!!