脚本练习

九、增加用户,参数选择
NUID=$[`cut -d: -f3 /etc/passwd | grep -v "65534" |sort -n|tail -1` 1]
NGID=$[`cut -d: -f3 /etc/group |grep -v "65534" |sort -n | tail -1` 1]
TODAY=$[`date "%s"`/86400]

usage() {
echo -e "33[31mUsage:33[0m `basename $0` [-u UID] username"
}

while getopts ":u:" SWITCH; do
case $SWITCH in
u)
NEWUID=$OPTARG
cut -d: -f3 /etc/passwd |grep "^$NEWUID" &> /dev/null && echo "UID exists." && exit 1 ;;
?)
usage exit 1 ''''
esac
done

shift $[$OPTIND-1]

if ! cut -d: -f1 /etc/group |grep "^$1" &> /dev/null; then
echo "$1:x:$NGID:" >> /etc/group
else
echo "The GROUP $1 exists."
exit 1
fi
if ! cut -d: -f1 /etc/passwd |grep "^$1" &> /dev/null; then
echo "$1:x:${NEWUID:=$NUID}:$NGID::/home/$1:/bin/bash" >> /etc/passwd
echo "$1:!!:$TODAY:0:99999:7:::" >> /etc/shadow
else "The user $1 exists."
exit 1
fi

cp -r /etc/skel /home/$1
chown -R $1:$1 /home/$1
chmod -R go=--- /home/$1

十、捕捉信号
1.
touch /tmp/traptest

mytrap() {
rm -f /tmp/traptest &> /dev/null
echo "Quid the script..."
exit 1
}

trap ''mytrap'' SIGINT

read A

2.
trap ''echo "Quit..."; exit 1'' SIGINT

for I in {1..25}; do
ping -W2 -c1 192.168.0.$I &> /dev/null
[ $? -eq 0 ] && echo "This station is online." || echo "This station is outline."
done

十一、数组脚本
grp1=(a b c d)
grp2=(e f g h i)
INDEX=$[$RANDOM%4]
echo ${grp2[$INDEX]}

十二、获取独立分区
TMP1=`mktemp /tmp/disk.XXXXXX`
df -l|grep -v "^/dev/[^[:space:]]*[[:space:]]*contentquot; |cut -d''%'' -f2 |grep -v -E "Mounted|/dev" > $TMP1

show_menu() {
let I=1
echo "Please choose an choice."
while read LINE; do
echo "$I $LINE"
let I
done < $TMP1
}

show_memu

read -p "Your choice(''Q'' for quit):" CHOICE

select_line() {
MYLINE=`head -n $1 $TMP1 |tail -1`
df -lh|grep "$MYLINEcontentquot;

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