简单的shell命令

#!/bin/bash
read -p "please set file:" n
if[ ! -e $n ]
then
touch $n
fi

#!/bin/bash
n=cat iplist
for IP in $n
do
ping -c 3 -i 0.2 -w 3 $IP &> /dev/null
if [ $? -eq 0 ] ; then
echo "Host $IP is on-line."
else
echo "Host $IP is off-line."
fi
done

#!/bin/bash
read -p "please set directory:" n
if [ ! -e $n ]
then
mkdir -p $n
else
echo "this $n directory exist"
fi

read -p "Enter your score (0-100) : " GRADE
if [ $GRADE -ge 85 ] && [ $GRADE -le 100 ] ; then
echo "$GRADE is Excellent"
elif [ $GRADE -ge 70 ] && [ $GRADE -le 84 ] ; then
echo "$GRADE is Pass"
elif [ $GRADE -gt 100 ] || [ $GRADE -lt 0 ] ; then
echo "$GRADE is does not exist"
else
echo "$GRADE is FAil"
fi

#!/bin/bash
read -p " Enter a name : " n
if [ -e $n ] && [ -d $n ] ; then
echo "$n is directory"
elif [ -e $n ] && [ -f $n ] ; then
echo "$n is file"
else
echo "$n is does not exist"
fi

#!/bin/bash
read -p "Enter The Users Password : " n
for u in cat forlistdoid $u &> /dev/nullif [ $? -eq 0 ]thenecho "Already exists"elseuseradd $u $> /dev/nullecho "$N" | passwd --stdin $u &> /dev/nullif [ $? -eq 0 ]thenecho "$u,Create success"elseecho "$u,Create failure"fifidone