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[root@local]  str="abcdefghijk"

例子1:
[root@local]  if [[ $idstr =~ "fgh" ]]
[root@local]  then
[root@local]      echo "包含"
[root@local]  else
[root@local]      echo "不包含"
[root@local]  fi

例子2:
[root@local]  result=$(echo $str | grep "cdefg")
[root@local]  if [[ "$result" != "" ]]
[root@local]  then
[root@local]      echo "包含"
[root@local]  else
[root@local]      echo "不包含"
[root@local]  fi