1、列印九九乘法表
[root@centos7 scripts]
# vim 99chengfb.sh
#!/bin/bash
for i in;do
#for j in `seq 1 $i`;do
#for j in `eval echo `;do
for j in
$(eval
echo);
do result=$[
$j*$i
]echo -e "$x$=$result \t\c"
done
echo
done
[root@centos7 scripts]
# ./99chengfb.sh
1x1=1
1x2=2 2x2=4
1x3=3 2x3=6 3x3=9
1x4=4 2x4=8 3x4=12 4x4=16
1x5=5 2x5=10 3x5=15 4x5=20 5x5=25
1x6=6 2x6=12 3x6=18 4x6=24 5x6=30 6x6=36
1x7=7 2x7=14 3x7=21 4x7=28 5x7=35 6x7=42 7x7=49
1x8=8 2x8=16 3x8=24 4x8=32 5x8=40 6x8=48 7x8=56 8x8=64
1x9=9 2x9=18 3x9=27 4x9=36 5x9=45 6x9=54 7x9=63 8x9=72 9x9=81
[root@centos7 scripts]
# cat ********.sh
#!/bin/bash
read -p "please input a num " num
for i in
`seq 1 $num`;do
for j in
`seq 1 $[$num-$i]`;
doecho -e " \c"
done
for k in
`seq 1 $[$i*2-1]`;
doecho -e "*\c"
done
echo
done
[root@centos7 scripts]
# ./********.sh
please input a num 5
****
*****
*******
*********
[root@centos7 scripts]
#
[root@centos7 scripts]
# cat color.sh
#!/bin/bash
greyel (
)yelgre (
)for i in;do
for((j=
1;j<=
4;j++
))do
if[ $[
$i%2] -eq 0 ]
;then
greyel
else
yelgre
fidone
echo
done
[root@centos7 scripts]
# ./color.sh
[root@centos7 scripts]
# cat batch_creatuser.sh
#!/bin/bash
until
["$#" -le 0 ];do
useradd
$1echo
"$1 is created"
shift
done
echo
"done"
[root@centos7 scripts]
# cat batch_deleteuser.sh
#!/bin/bash
#while [ "$#" -gt 0 ];do
while
[! -z "$1"];
douserdel -r $1
&> /dev/null &&
echo
"$1 is deleted"
shift
done
echo
"done"
[root@centos7 scripts]
# cat check_version.sh
#!/bin/bash
version (
)version
[root@centos7 scripts]
# ./check_version.sh
this is 7 version!
!!
[root@centos7 scripts]
# cat guest.sh
#!/bin/bash
rand=$[
$random%11]
while
true;do
read -p "please input a number " num
if[[$num
=~ ^[
[:digit:]
]+$ ]];
thenif[
$rand -gt $num];
then
echo little
elif
[$rand -lt $num];
then
echo great
else
echo right
break
fielse
echo
"please input a number:1-10"
continue
fidone
[root@centos7 scripts]
# ./guest.sh
please input a number 6
great
please input a number 5
great
please input a number 3
little
please input a number 4
right
[root@centos7 scripts]
# cat jiecheng.sh
#!/bin/bash
read -p "please input a number: " num
fact(
)fact $num
[root@centos7 scripts]
# ./jiecheng.sh
please input a number: 9
362880
[root@centos7 scripts]
# ./test_for.sh
sum=5050
sum1=2500
[root@centos7 scripts]
# cat test_for.sh
#!/bin/bash
declare -i sum=0
declare -i sum1=0
for i in;do
let sum=sum+i
done
echo sum=
$sum
for i in;do
let sum1+=i
done
echo sum1=
$sum1
[root@centos7 scripts]
# ./test_for.sh
sum=5050
sum1=2500
[root@centos7 scripts]
# cat test_case.sh
#!/bin/bash
read -p "do you argee? yes or no:" ans
if[ -z "$ans"];
then
echo
"please input yes or no"
exit
ficase
$ans
in[yy]
|[yy]
[ee]
[ss]
)echo your answer is yes ;;
[nn]
|[nn]
[oo]
)echo your answer is no ;;
*)echo your answer is false
esac
[root@centos7 scripts]
# ./test_case.sh
do you argee? yes or no:y
your answer is yes
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