1
#!/bin/bash
##change filename of *.txt to *.doc
##Written by adai
read -p "Please input a directory:" f
echo "Old filename:"
ls $f
for i in `ls $f | grep '.txt' | awk -F"." '{print $1}'`
do
mv $f/$i.txt $f/$i.doc
done
echo "New filename:"
ls $f
2
#!/bin/bash
read -p "Please input the username: " user
while :
do
if who | grep -qw $user
then
echo $user login.
else
echo $user not login.
fi
sleep 300
done
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