shell脚本从文件中读取并根据模式执行

Question

需要有关shell脚本的建议，以根据模式

读取文件和回显

 cat revs.txt
 1
 3
 8:13
 18:71
 89


  if x:x then echo "This is revs range"
   else 
  echo " this is single rev"

Answer 1

while read rev
do
    case "$rev" in
    (*:*) echo "This is a range of revisions $rev";;
    (*)   echo "This is a single revision $rev";;
    esac
done < revs.txt