bash RANDOM

0〜30s.

while true ;do date; toDoSomething;RND=`expr $RANDOM % 30`;echo $RND;sleep $RND;done

bash RANDOM

0〜30s.

while true ;do date; toDoSomething;RND=`expr $RANDOM % 30`;echo $RND;sleep $RND;done

bash 拡張子を変更しつつcopy

$ for i in *.jpg; do cp $i ${i%.jpg}.jpg_uptodate; done

$ for i in *.mp4; do cp $i ${i%.mp4}.mp4_uptodate; done