Linux编程习题总结

一.判断一个字符串中是否含有某个子串,若没有,则追加到该字符串的最后

data="machi:is:a:good:boy"
x=$IFS    #IFS为系统变量,分隔符
IFS=":"
count=0
for i in $data
do
    [ $i = $1 ] && let count++
done
if [ $count -eq 0 ];then
    echo "not found"
    data=$data:$1
    echo $data
else
    echo "found"
fi