shell字符串截取方法分享

TESTSTRING="teststring helloworld"
 echo ${TESTSTRING##*s}
        "tring helloworld"
 echo ${TESTSTRING#*s}
        "tstring helloworld"
 echo ${TESTSTRING%%s*}
        "te"
echo ${TESTSTRING%s*}
        "test"

${varible:n1:n2}   截取从n1到n2长度的字符串
 TESTSTRING="teststring helloworld"

echo  ${TESTSTRING:0:4}
        "test"

 echo  ${TESTSTRING:1:5}
        "ests"

echo ${TESTSTRING:0:-2}
        "teststring hellowor"