Bài tập windows power shell

Find out if user exists in etcpasswd file etcpasswd file stores essential information required during login. All you have to do is search this file for user name using following syntax: egrep i username etcpasswd For, example find out if vivek user exists or not, enter: egrep i vivek etcpasswd Sample output:

Find out if user exists in /etc/passwd file

/etc/passwd file stores essential information required during login All you have to do is search this file for user name using following syntax:

$ egrep -i "^username" /etc/passwd

For, example find out if vivek user exists or not, enter:

$ egrep -i "^vivek" /etc/passwd

Sample output:

vivek:x:1000:1000:Vivek Gite,,,,:/home/vivek:/bin/bash

A quick shell script code:

#!/bin/bash

# init

USERID="$1"

#

/bin/egrep -i "^${USERID}" /etc/passwd

if [ $? -eq 0 ] ; then

echo "User $USERID exists in /etc/passwd"

else

echo "User $USERID does not exists in /etc/passwd"

fi

#

Normally, exit status is 0 returned if user accounts (lines) are found and 1 otherwise.

Find out if group exists in /etc/group file

/etc/group is an text file which defines the groups to which users belong under Linux and UNIX operating system Again, you have to search /etc/group file using following syntax:

$ egrep -i "^groupname" /etc/group

For, example find out if vivek group exists or not, enter:

$ egrep -i "^vivek" /etc/group

id command

id is another command to display user / group information for any USERNAME, or the current user To find out more about user called, tom, enter:

$ id tom

Sample output

id: tom: No such user

To find out ftpuser group, enter:

$ id -g ftpuser

Sample output:

id: ftpuser: No such user

id command exit status is 0 returned if user accounts (lines) are found and 1 otherwise A sample shell script using id command:

#!/bin/bash

USERID="$1"

/bin/id $USERID 2>/dev/null

[ $? -eq 0 ] && echo "User found" || echo "User not found"

/bin/id -g $USERID 2>/dev/null

[ $? -eq 0 ] && echo "Group found" || echo "Group not found"

Bai6a

#!/bin/bash

echo -n "nhap n:"

read n

for (( i = 1;i <= $n; i++ ))

do

for (( j = 0;j < $n-i; j++ ))

do

echo -n " "

done

for (( k = $n-i;k < $n; k++ ))

do

echo -n "*"

done echo ""

done

6b

#!/bin/bash

echo -n "nhap n:"

read n

for (( i = 1;i <= $n; i++ ))

do

for (( j = 0;j < $n-i; j++ ))

do

echo -n " "

for (( k = $n-i;k < $n; k++ ))

do

echo -n "$i"

done echo ""

done

6c

#!/bin/bash

echo -n "nhap n:"

read n

for (( i = 1;i <= $n; i++ ))

do

for (( j = 0;j < $n-i; j++ ))

do

echo -n " "

done

#for (( k = $n-i;k < $n; k++ ))

#do

for (( m = 1; m <= i ; m++)) do

echo -n "$m"

done

#done

echo ""

done

#!/bin/bash

menu()

{

echo "1 ) UNIX"

echo "2) Solaris"

echo "3) Free BSD"

echo "4) Windows"

echo "5) Other"

echo "6) Exit"

echo -n "Xin chọn 1 mục (1 5) :"

read chon

case $chon in

1) echo "You have selected UNIX";; 2) echo "You have selected Solaris";; 3) echo "You have selected Free BSD";; 4) echo "You have selected Windows";; 5) echo "You have selected Other";; 6) exit 1;;

*) echo "Error";;

}

while [ "$chon" != "6" ]

do

menu

done

#!/bin/bash

kq=0

while [ "$kq" != "6" ]

do

clear

echo "1 ) UNIX"

echo "2) Solaris"

echo "3) Free BSD"

echo "4) Windows"

echo "5) Other"

echo "6) Exit"

echo -n "Xin chọn 1 mục (1 5) :"

read chon

case $chon in

1) echo "You have selected UNIX";; 2) echo "You have selected Solaris";; 3) echo "You have selected Free BSD";; 4) echo "You have selected Windows";; 5) echo "You have selected Other";; 6) exit 1;;

*) echo "Error";;

esac

echo -n "Bam enter de tiep tuc"

read

done

#!/bin/bash

case `date +'%A'` in

Monday) echo "Thu hai";;

Tuesday) echo "Thu ba";;

Wednesday) echo "Thu tu";;

Thurday) echo "Thu nam";;

Friday) echo "Thu sau";;

Saturday) echo "Thu bay";;

Sunday) echo "Chu nhat";;

*) echo "Error";;

esac

cuu chuong

#!/bin/bash

i=1

while [ $i -le 10 ]

do

echo $1x$i=`expr $i \* $1`

i=`expr $i + 1`

done

giai thua

giaithua $prev

result=`expr $result \* $1`

f

}

result=1

giaithua $1

echo "giai thua $1 = $result"

in sao

#!/bin/bash

for (( i = 1;i <= $1; i++ ))

do

for (( j = 1;j <= i; j++ ))

do

echo -n "*"

done

echo " "

done

#!/bin/bash

for (( i = 1;i <= $1; i++ ))

do

for (( j = 1;j <= i; j++ ))

do

echo -n "$i"

done

echo " "

done

#!/bin/bash

for (( i = 1;i <= $1; i++ ))

do

for (( j = 1;j <= i; j++ ))

do

echo -n "$j"

done

echo " "

done

tao tap tin

#!/bin/bash

#taotaptin 10 name

count=1

while [ $count -le $1 ]

do

touch $2$count

count=`expr $count + 1`

done

tao thu muc

#!/bin/bash

#taothumuc 10 name

count=1

while [ $count -le $1 ]

do

mkdir $2$count

count=`expr $count + 1`

done

trung binh cong

#!/bin/bash

n=$#

tong=0

while [ $1 ]

do

tong=`expr $tong \+ $1`

shif

done

echo "trung binh cong =`expr $tong \/ $n`"

echo $tong

echo $n

#!/bin/bash

n=$#

tong=0

for var

do

tong=`expr $tong + $var`

done

echo "trung binh = `expr $tong / $n`"

#!/bin/bash

# tao/xoa nhieu thu muc CT <op> <ten> <soluong>

#kiem tra tham so

if [ -z "$1" ]

then

echo "Sai tham so"

echo "Cu phap test11 -t / -x"

f

if [ -z "$2" ]

then

echo "Chua nhap ten thu muc"

f

# kiem tra ton tai cua folder

if [ -d "$2" ]

then

if [ "$1" = "-x" ] #xoa thu muc

then

echo "dang xoa "

sleep 1 rmdir $2 echo "xoa thanh cong"

f

elif [ "$1" = "-t" ] #tao thu muc

then

if [ -z "$3" ] #kiem tra tham so so luong then

echo "Sai tham so"

echo "Cu phap test11 -t name soluong" else

#tao thu muc dem=1 while [ $dem -le $3 ] do

mkdir $2$dem dem=`expr $dem + 1`

done echo "tao thanh cong thu muc"

f else

echo "Thu muc khong ton tai"

f

#!/bin/bash

clear

t=`expr $# % 2`

q=0

if [ $# -ge 2 ] && [ $t -eq 0 ]

then

while [ $1 ]

do

echo " -"

if [ -f $1 ] then

a=$1 shif else

echo "$1 khong phai fle"

b=$1 q=1 shif f

if [ -d $1 ] && [ $q -ne 1 ] then

cp $a $1 echo "Da copy { $a } vao { $1 }"

shif else

echo "$1 khong phai la thu muc hoac fle truoc do nhap sai" echo "khong copy duoc"

shif f

done

else

echo "tham so khong dung ==> taptin thumuc_dich"

f

if [ -d $1 ]

#b=0

then

a=`ls $1`

cd $1

for x in $a

do

if [ -f $x ]

then

echo $x

#b="$b $x"

f

done

#echo "$b"

#cd

else

echo "Ban nhap khong dung thu muc"

f

65656562312312 new

#!/bin/bash

#copy fle vao nhieu thu muc theo cu phap

# <TM> <TM> <fle>

# kiem tra toi thieu 2 tham so

if [ $# -lt 2 ]

then

echo "sai cu phap"

echo "<TM> <TM> <fle>"

exit 1

f

luu=""

while [ "$2" ]

do

luu="$luu $1"

shif

done

for thumuc in $luu

do

if [ ! -d $thumuc ]

then

read -p "Thu muc $thumuc chua co, tao? C/K?" bien case $bien in

[cC]) mkdir $thumuc;;

*) exit 2 esac elif [ -f $1 ]

then

cp $1 $thumuc else

echo "$1 phai tap tin"

exit 3 f

done