1.shell programming shows basic information of computer and basic script. Only for version 6.7.
COLOR="\033[1;36m" COLOREND="\033[0m" echo -e "CPU type is $COLOR `lscpu |grep 'Model name'|tr -s ' '|cut -d: -f2`$COLOREND" echo -e "Disk space is $COLOR `lsblk |grep 'disk' |tr -s ' '|cut -d' ' -f4|head -n 1` $COLOREND" echo -e "Memory size is $COLOR `free -h |grep 'Mem'|tr -s ' '|cut -d' ' -f2` $COLOREND" echo -e "OS Verion is $COLOR `cat /etc/redhat-release` $COLOREND" echo -e "kernel version is $COLOR `uname -r` $COLOREND" echo -e "IPaddr is $COLOR ` ifconfig ens33 |grep 'netmask'|tr -s ' '|cut -d' ' -f3`$COLOREND"
2. Find out the IPv4 address of the local computer in the result of ifconfig "network card name" command
[root@centos7 scripts38]#ifconfig ens33 |grep netmask|tr -s ' '|cut -d' ' -f3 192.168.11.131
[root@centos7 ~]#ifconfig ens33 |grep ask | grep -o "\([0-9]\{1,3\}\.\)\{3\}[0-9]\{1,3\}"|head -1
192.168.6.1363. Find out the maximum percentage of partition space utilization
[root@centos7 scripts38]#df|grep '/dev/sd'|tr -s ' '|cut -d' ' -f5|tr -d %|sort -nr|head -n 1 17
4. Find out the user name, UID and shell type of the maximum user UID
[root@centos7 scripts38]#cat /etc/passwd |cut -d: -f1,3,7 |sort -t: -k2 -nr|head -n 1 nfsnobody:65534:/sbin/nologin
5. Find out the permissions of / tmp and display them digitally
[root@centos7 ~]#stat /tmp |grep 'drwx'|cut -d' ' -f2|tr -dc [0-9] 1777
6. Statistics the number of connections currently connected to each remote host IP, and sort them from large to small.
netstat -tun|grep ESTAB|tr -s " " : |cut -d: -f6|sort -nr|uniq -c
1 192.168.6.17. Display lines in / proc/meminfo file beginning with size s (Requirements: Two methods)
[root@centos7 ~]#grep ^[sS] /proc/meminfo SwapCached: 2288 kB SwapTotal: 2097148 kB SwapFree: 2058044 kB Shmem: 16796 kB Slab: 88744 kB SReclaimable: 39980 kB SUnreclaim: 48764 kB
[root@centos7 ~]#grep '^s\|^S' /proc/meminfo SwapCached: 2288 kB SwapTotal: 2097148 kB SwapFree: 2058044 kB Shmem: 16796 kB Slab: 88744 kB SReclaimable: 39980 kB SUnreclaim: 48764 kB
[root@centos7 ~]#grep ^[s\|S] /proc/meminfo SwapCached: 2288 kB SwapTotal: 2097148 kB SwapFree: 2058044 kB Shmem: 16796 kB Slab: 88744 kB SReclaimable: 39980 kB SUnreclaim: 48764 kB
[root@centos7 ~]#grep -w \<'s\|S.*' /proc/meminfo SwapCached: 2288 kB SwapTotal: 2097148 kB SwapFree: 2058044 kB Shmem: 16796 kB Slab: 88716 kB SReclaimable: 39980 kB SUnreclaim: 48736 kB
8. Display rows in / etc/passwd file that do not end with / bin/bash
[root@centos7 ~]#cat /etc/passwd |grep -v '/bin/bash$' bin:x:1:1:bin:/bin:/sbin/nologin daemon:x:2:2:daemon:/sbin:/sbin/nologin adm:x:3:4:adm:/var/adm:/sbin/nologin lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin sync:x:5:0:sync:/sbin:/bin/sync shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown halt:x:7:0:halt:/sbin:/sbin/halt mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
9. Display user rpc default shell program
[root@centos7 ~]#cat /etc/passwd |grep '\<rpc\>'|cut -d: -f7 /sbin/nologin
10. Find two or three digits in / etc/passwd
[root@centos7 ~]#cat /etc/passwd |grep "\<[0-9]\{2,3\}\>"
mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
operator:x:11:0:operator:/root:/sbin/nologin
games:x:12:100:games:/usr/games:/sbin/nologin
ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin
nobody:x:99:99:Nobody:/:/sbin/nologin
systemd-network:x:192:192:systemd Network Management:/:/sbin/nologin
dbus:x:81:81:System message bus:/:/sbin/nologin
polkitd:x:999:998:User for polkitd:/:/sbin/nologin
libstoragemgmt:x:998:995:daemon account for libstoragemgmt:/var/run/lsm:/sbin/nologin
colord:x:997:994:User for colord:/var/lib/colord:/sbin/nologin11. Display CentOS 7's / etc/grub2.cfg file, beginning with at least one blank character and followed by a non-
Lines of blank characters
[root@centos7 ~]#cat /etc/grub2.cfg |grep ^[[:space:]].*
load_env
set default="${next_entry}"
set next_entry=
save_env next_entry
set boot_once=true
set default="${saved_entry}"
menuentry_id_option="--id"
menuentry_id_option=""
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
if [ x$feature_all_video_module = xy ]; then
insmod all_video
else
insmod efi_gop
insmod efi_uga
insmod ieee1275_fb
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
fi
set timeout_style=menu
set timeout=5
set timeout=5
source ${prefix}/user.cfg
if [ -n "${GRUB2_PASSWORD}" ]; then
set superusers="root"
export superusers
password_pbkdf2 root ${GRUB2_PASSWORD}
fi
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod xfs
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1' b6888a3b-3755-49af-b1db-5b412eda8657
else
search --no-floppy --fs-uuid --set=root b6888a3b-3755-49af-b1db-5b412eda8657
fi
linux16 /vmlinuz-3.10.0-957.el7.x86_64 root=UUID=05bdb265-31b6-4a0f-942b-f69d4b103e8d ro crashkernel=auto rhgb quiet LANG=en_US.UTF-8
initrd16 /initramfs-3.10.0-957.el7.x86_64.img
load_video
insmod gzio
insmod part_msdos
insmod xfs
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1' b6888a3b-3755-49af-b1db-5b412eda8657
else
search --no-floppy --fs-uuid --set=root b6888a3b-3755-49af-b1db-5b412eda8657
fi
linux16 /vmlinuz-0-rescue-55bf685d782642d9bcbb1eaf123db175 root=UUID=05bdb265-31b6-4a0f-942b-f69d4b103e8d ro crashkernel=auto rhgb quiet
initrd16 /initramfs-0-rescue-55bf685d782642d9bcbb1eaf123db175.img
source ${config_directory}/custom.cfg
source $prefix/custom.cfg;12. Find the line in the "netstat-tan" command result that ends with LISTEN followed by any number of blank characters
[root@centos7 ~]#netstat -tan|grep 'LISTEN[[:space:]]\+' tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:6000 0.0.0.0:* LISTEN tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN tcp6 0 0 :::111 :::* LISTEN tcp6 0 0 :::6000 :::* LISTEN tcp6 0 0 :::22 :::* LISTEN tcp6 0 0 ::1:631 :::* LISTEN tcp6 0 0 ::1:25 :::* LISTEN
13. Display usernames and UIDs on CentOS7 with all UIDs less than 1000
[root@centos7 ~]#cat /etc/passwd |cut -d':' -f1,3 |grep -v '\<[0-9]\{4\}\>'
root:0
bin:1
daemon:2
adm:3
lp:4
sync:5
shutdown:6
halt:7
mail:8
operator:11
games:12
ftp:14
nobody:99
systemd-network:192
dbus:81
polkitd:999
libstoragemgmt:998
colord:997
rpc:32
gluster:996
saslauth:995
abrt:173
rtkit:172
pulse:171
radvd:75
rpcuser:29
nfsnobody:65534
unbound:994
chrony:993
qemu:107
tss:59
usbmuxd:113
geoclue:992
ntp:38
sssd:991
setroubleshoot:990
saned:989
gdm:42
gnome-initial-setup:988
sshd:74
avahi:70
postfix:89
tcpdump:72[root@centos7 ~]#cat /etc/passwd |cut -d':' -f1,3 |grep '\<[0-9]\{1,3\}\>'
root:0
bin:1
daemon:2
adm:3
lp:4
sync:5
shutdown:6
halt:7
mail:8
operator:11
games:12
ftp:14
nobody:99
systemd-network:192
dbus:81
polkitd:999
libstoragemgmt:998
colord:997
rpc:32
gluster:996
saslauth:995
abrt:173
rtkit:172
pulse:171
radvd:75
rpcuser:29
unbound:994
chrony:993
qemu:107
tss:59
usbmuxd:113
geoclue:992
ntp:38
sssd:991
setroubleshoot:990
saned:989
gdm:42
gnome-initial-setup:988
sshd:74
avahi:70
postfix:89
tcpdump:7214. Add users bash, testbash, basher, sh, nologin (whose shell is / sbin/nologin) and find out rows with the same name of / etc/passwd user name and shell
[root@centos7 ~]#grep '\(.*\+\):.*\<\1$' /etc/passwd sync:x:5:0:sync:/sbin:/bin/sync shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown halt:x:7:0:halt:/sbin:/sbin/halt nologin:x:1026:1032::/home/nologin:/sbin/nologin
[root@centos7 ~]#egrep "(.*+):.*\<\1$" /etc/passwd sync:x:5:0:sync:/sbin:/bin/sync shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown halt:x:7:0:halt:/sbin:/sbin/halt nologin:x:1026:1032::/home/nologin:/sbin/nologin
15. Use df and grep to extract disk partition utilization and sort from large to small
[root@centos7 ~]#df |grep '/dev/sd'|tr -s ' '|cut -d' ' -f5 |sort -nr 17% 5% 1%
[root@centos7 ~]#df |grep '/dev/sd'|grep -o '[0-9]\{0,3\}%' |sort -nr
17%
5%
1%16. View the large version of Linux.
[root@centos7 data]#cat /etc/redhat-release |cut -d. -f1|grep -o '[[:digit:]]' 7
17. Display UID s and default shell s for three users root, mage, wang
[root@centos7 scripts38]#cat /etc/passwd |grep -w '^root\|^wang\|^mage'|cut -d: -f1,3,7 root:0:/bin/bash wang:1027:/bin/bash mage:1028:/bin/bash
18. Find a line in the / etc/rc.d/init.d/functions file with the first line of a word (including underscores) followed by a small bracket
[root@centos7 data]#cat /etc/rc.d/init.d/functions |grep '^[[:alpha:]].*(.*).*'
systemctl_redirect () {
checkpid() {
daemon() {
killproc() {
pidfileofproc() {
pidofproc() {
status() {
echo_success() {
echo_failure() {
echo_passed() {
echo_warning() {
update_boot_stage() {
success() {
failure() {
passed() {
warning() {
action() {
strstr() {
is_ignored_file() {
convert2sec() {
is_true() {
is_false() {
apply_sysctl() {
strstr "$(cat /proc/cmdline)" "rc.debug" && set -x19. Use egrep to extract its base name and_list from / etc/rc.d/init.d/functions
Catalog Name [root@centos7 data]#echo /etc/rc.d/init.d/functions |egrep -o "^[/].*/" /etc/rc.d/init.d/
20. Statistics the number of times each host logs in with root IP address in last command
[root@centos7 data]#last |grep 'root' | egrep -o \([0-9]\{1,3\}\.\)\{3\}[0-9]\{1,3\}|sort|uniq -c|sort -nr
70 192.168.6.1
1 172.18.37.3721. Extended regular expressions are used to represent 0-9, 10-99, 100-199, 200-249, 250-255, respectively.
[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5]
22. Display all IPv4 addresses in the ifconfig command results
[root@centos7 data]#ifconfig |egrep -o "(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])"
192.168.6.136
255.255.255.0
192.168.6.255
172.18.7.7
255.255.0.0
172.18.255.255
127.0.0.1
255.0.0.0
192.168.122.1
255.255.255.0
192.168.122.25523. Remove and sort each character in welcome to magedu linux, ranking it first with more repetitions
[root@centos7 data]#echo welcome to magedu linux |grep -o "."|sort|uniq -c|sort -nr
3 e
3
2 u
2 o
2 m
2 l
1 x
1 w
1 t
1 n
1 i
1 g
1 d
1 c
1 a24. Write a script backup.sh to backup / etc / directory to / backup/etcYYYYmm-dd every day
COLOR="\033[1;36m"
COLOREND="\033[0m"
echo -e "${COLOR}Starting backup ...$COLOREND"
cp -av /etc/ /data/etc_backup-`date +%F`
echo -e "${COLOR}Backup is finished$COLOREND"25. Write the script disk.sh to show the maximum utilization of space in the current hard disk partition
COLOR="\033[1;36m"
COLOREND="\033[0m"
echo -e "${COLOR}Starting Hard Disk Inspection ...$COLOREND"
echo -e "${COLOR}`df|grep "/dev/sd" |tr -s " "|cut -d ' ' -f5|sort -nr|head -1`$COLOREND"
echo -e "${COLOR}Hard Disk Inspection is finished$COLOREND"26. Write a script links.sh to display the IPv4 address and the number of connections for each remote host that is connected to the host, and sort them from large to small by the number of connections.
COLOR="\033[1;36m"
COLOREND="\033[0m"
echo -e "${COLOR}Linsk ...$COLOREND"
echo -e "${COLOR}` netstat -tun|grep ESTAB|tr -s " " : |cut -d: -f6|sort -nr|uniq -c`$COLOREND"
echo -e "${COLOR}Linsk$COLOREND"27. Location of General Version Information Storage
[root@centos7 data]#cat /proc/partitions Hard Disk Size Storage Location [root@centos7 data]#cat /proc/meminfo Memory size storage location [root@centos7 data]#cat /proc/cpuinfo CPU and other storage locations
28. Remote execution of scripts.
Start the service first, 6 bring the service with you
[root@centos6 ~]#service httpd start
Starting httpd: httpd: apr_sockaddr_info_get() failed for centos6.10.localdomain
httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName
[ OK ]Copy the script to host 6 [root@centos7 scripts38]#scp 2systeminfo.sh 192.168.6.129:/var/www/html/ The authenticity of host '192.168.6.129 (192.168.6.129)' can't be established. RSA key fingerprint is SHA256:7SNWeID7Jr5cvOTZkLQWElsa/MbwymmEUZRhTd8qxJ4. RSA key fingerprint is MD5:3e:fa:86:dd:c6:b8:41:34:a0:50:f3:f6:b3:17:82:9a. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '192.168.6.129' (RSA) to the list of known hosts. root@192.168.6.129's password: 2systeminfo.sh 100% 964 581.7KB/s 00:00
Check to see if you copied to host 6 [root@centos6 ~]#ls /var/www/html/ 2systeminfo.sh
It can be implemented by executing on other hosts.
[root@centos7 scripts38]#curl 192.168.6.129/2systeminfo.sh |bash
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 100 964 100 964 0 0 335k 0 --:--:-- --:--:-- --:--:-- 470k29. Find out the path of the component in the result of the ldd/usr/bin/cat command
[root@centos7 data]#ldd /usr/bin/cat | grep -o '/[^[:space:]]\+' /lib64/libc.so.6 /lib64/ld-linux-x86-64.so.2
30. Duplicate / etc/profile / tmp / record, Find Replacement Command delete empty characters in / tmp/profile file
[root@centos7 data]#cp /etc/profile /tmp/ [root@centos7 data]#vim /tmp/profile :%s/^[[:space:]]\+//g
31. Copy / etc/rc.d/init.d/functions / tmp directory, Find each beginning with an empty character with a replacement command of / tmp/functions, and add # numbers
[root@centos7 data]#cp /etc/rc.d/init.d/functions /tmp/ [root@centos7 data]#vim /tmp/functions :%s/^[[:space:]]/#/g
31. Write the script sumid.sh to calculate the sum of the UID s of the 10th and 20th users in the / etc/passwd file
NUM1=` cat /etc/passwd |head -1 |cut -d: -f3` NUM10=`cat /etc/passwd |head -10 |tail -1|cut -d: -f3` SUM=$[NUM1+NUM10] echo "num1 user UUID + num10 user UUID = $SUM"
32. Write the script sumspace.sh, pass two file paths as parameters to the script, and calculate the sum of all blank lines in the two files.
NUM1=` grep '^$' $1 |wc -l` NUM2=` grep '^$' $2 |wc -l` SUM=$[NUM1+NUM2] echo "The sum of blank lines =$SUM"
33. Write script sumfile.sh, statistics / etc, /var, /usr directory, how many first-level subdirectories and files are there?
ETC=`ls -l /etc/ | wc -l` VAR=`ls -l /var/ | wc -l` USR=`ls -l /usr/ | wc -l` SUM=$[ETC+VAR+USR] echo "sum=$SUM"
34. Write the script argsnum.sh, accept a file path as a parameter; if the number of parameters is less than 1,
The user is prompted to "give at least one parameter" and quit immediately; if the number of parameters is not less than 1, the number of blank lines in the file to which the first parameter refers is displayed.
[ $# -lt 1 ] && { echo "At least one parameter should be given"; exit 10; }
NUM1=` grep '^$' $1 |wc -l`
echo "The blank lines =$NUM1"35. Write a script hosting.sh, accept IPv4 address of a host as a parameter, test whether it is connected
Tong. If it can ping, the user is prompted to "the IP address is accessible"; if it cannot ping, the user is prompted to "the IP address is not accessible".
. /data/scripts38/color.sh
read -p "Please enter a correct IP:" IP
# [[ $# -lt 1 ]] && { echo "Please enter a IP"; exit 10; }
[[ "$IP" =~ ^(([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$ ]] || { echo -e "${COLOR} Please enter a IP${COLOREND}" ; exit 20;}
ping -c1 -w2 $IP &> /dev/null && echo -e "${COLOR}this IP Address accessible ${COLOREND}" ||echo -e "${COLOR}this IP Address inaccessible ${COLOREND}"36. Write a script checkdisk.sh to check disk partition space and inode usage. If it exceeds 80%, the broadcast warning space will be full.
USE=` df|grep "/dev/sd" |tr -s " " %|cut -d "%" -f5|sort -nr|head -1` INODE=`df -i|grep "/dev/sd" |tr -s " " %|cut -d "%" -f5|sort -nr|head -1` test $USE -gt 80 && echo " disk will be full " &&echo disk will be full | mail -s warning root || echo "disk is normal" [[ "$INODE" -gt 80 ]] && echo " inode will be full " &&echo inode will be full | mail -s warning root || echo "inode is normal" unset USE INODE
37. Write a script per.sh to determine whether the current user is unreadable and not writable to the specified parameter file
. /data/scripts38/color.sh
#read -p "Please enter a file:" FILE
[[ $# -lt 1 ]] && { echo -e "${COLOR}No input file${COLOREND}" ; exit 10;}
[[ ! -e $@ ]] && { echo -e "${COLOR}file does not exist${COLOREND}" ; exit 20;}
[ ! -r $@ -a ! -w $@ ] && { echo -e "${COLOR}The file is unreadable and not writable${COLOREND}" ;}
[ -r $@ -a ! -w $@ ] && { echo -e "${COLOR}The file is readable and not writable${COLOREND}" ;}
[ -r $@ -a -w $@ ] && { echo -e "${COLOR}The file is readable and writable${COLOREND}" ;}38. Write the script excute.sh to determine whether the parameter file is a common file with SH suffix. If so, add all executable privileges, or prompt the user for non-script files.
. /data/scripts38/color.sh
[[ $# -lt 1 ]] && { echo -e "${COLOR}No input file${COLOREND}" ; exit 10;}
[[ ! -e $@ ]] && { echo -e "${COLOR}file does not exist${COLOREND}" ; exit 20;}
[ ! -f $@ ] && { echo -e "${COLOR}Not an ordinary document${COLOREND}" ; exit 30;}
[[ $@ =~ .sh$ ]] && (chmod a+x $@ ; echo -e "${COLOR}$@Is a script file ${COLOREND}" ) || { echo -e "${COLOR}User Non-script Files${COLOREND}" ; exit 40;}39. Write scripts nologin.sh and login.sh to prohibit and allow ordinary users to log on to the system
. /data/scripts38/color.sh
[ -f /etc/nologin ] && echo -e "${COLOR}Normal users are prohibited from logging in${COLOREND}"|| (touch /etc/nologin ; echo -e "${COLOR}Normal users are prohibited from logging in${COLOREND}"). /data/scripts38/color.sh
[ -f /etc/nologin ] && (rm -f /etc/nologin ; echo -e "${COLOR}Ordinary users can log in${COLOREND}")||echo -e "${COLOR}Ordinary users can log in${COLOREND}"40. Age
read -p "Input your age: " AGE
if [[ ! "$AGE" =~ ^[0-9]+$ ]]; then
echo "Please input a digit age"
elif [ $AGE -lt 18 ];then
echo "GOOD good study"
elif [ $AGE -lt 80 ];then
echo "goot goot work"
elif [ $AGE -le 120 ];then
echo "enjoy life"
else
echo "Welcome to the earth"
fi41. Cocks and rabbits in the same cage, head 37, feet 94
read -p "please input the head number:" HEAD read -p "please input the foot number:" FOOT Rabbit=$[FOOT/2-HEAD] Chook=$[HEAD-Rabbit] echo "Number of rabbits:" $Rabbit echo "Number of chook:" $Chook
Change ens33 to eth0
[root@centos7 ~]#sed -ri '/^[[:space:]]+linux16/s#(.*)#\1 net.ifnames=0#' /boot/grub2/grub.cfg
[root@centos7 ~]#sed -ir '/GRUB_CMDLINE_LINUX/s@"$@ net.ifnames=0"@' /etc/default/grub
Close selinux
[root@centos7 data]#sed -i 's/SELINUX=enforcing/SELINUX=disabled/ ' /etc/selinux/config
42.
cat <<EOF
1.I don't know what I want to do.
2.It's not easy to do anything.
3.It's not good to do something.
4.Dinner
5.Sleep
6.Bean Bean
EOF
read -p "Lottery draw, enter a number (1)-6)): " NUM
case $NUM in
1)
echo "Better to sleep than to do anything."
;;
2)
echo "Everything in dreams, what bicycles do you want?"
;;
3)
echo "Eat, sleep, play beans, day after day"
;;
4)
echo "Eat less. It's time to lose weight."
;;
5)
echo "Sleep is a whole day."
;;
6)
echo "What kind of beans do you want?"
;;
*)
echo "Welcome to Earth"
esac43. Write the script createuser.sh to realize the following functions: Make user names as parameters, if the user with specified parameters exists, it will show its existence, otherwise it will be added; Display the id number of user added and other information.
if [ -z "$1" ];then
read -p "please input user:" USER
if
[ -z $USER ] ;then
echo "Password cannot be empty"
exit 10;
else
NAME=$USER
fi
else
NAME=$USER
fi
if id $NAME &> /dev/null ; then
echo "$NAME Account already exists"
exit 20
else
useradd $NAME && echo "Password Creation Successful"
echo magedu | passwd --stdin $NAME &> /dev/null && echo "The initial password is: magedu"
passwd -e $NAME &> /dev/null
echo "userinfo:`id $NAME`"
fi44. Write a script / root/bin/yesorno.sh, mention yes or no, and judge whether yes or no, or any other information, is lost by a household.
read -p "Do you agree? (yes or no): " ANSWER
case $ANSWER in
[Yy]|[Yy][Ee][sS])
echo YES
;;
[Nn]|[Nn][Oo])
echo NO
;;
*)
echo input false
esac45. Write a script / root/bin/filetype.sh, judge the path of the incoming items, and show the type of the items (ordinary, record, link, other types)
read -p "Enter a file:" A
if [ -z $A ];then
echo "Input cannot be empty"
exit
elif [ ! -e $A ];then
echo "file does not exist"
exit
elif [ -d $A ];then
echo "This is a directory."
exit
elif [ -L $A ];then
echo "This is a link file."
exit
elif [ -f $A ];then
echo "This is an ordinary document."
exit
else
echo "other file"
exit
fi46. Write a script / root/bin/checkint.sh to determine whether the parameters of user input are positive integers
. /data/scripts38/color.sh
read -t 30 -p "please input a number:" NUM
if [ -z $NUM ] ; then
echo -e "${COLOR}Input cannot be empty ${COLOREND}"
exit 10
elif [[ "$NUM" =~ ^[0-9]+$ ]] ;then
echo "This is a positive integer."
exit 20
else
echo "This is not a positive integer."
exit 30
fi47. Let PATH environment variables of all households have more than one path, such as: / usr/local/apache/bin
echo 'PATH=/usr/local/apache/bin:$PATH' >> /etc/profile.d/env.sh source /etc/profile.d/env.sh
48. When the user root logs in, turn the command reference character into red, and activate the following alias:
rm='rm –i'
cdnet='cd /etc/sysconfig/network-scripts/'
editnet='vim /etc/sysconfig/network-scripts/ifcfg-eth0'
editnet='vim/etc/sysconfig/network-scripts/ifcfg-eno167736 or
ifcfg-ens33'(if the system is CentOS7)
echo "PS1='\[\e[1;31m\][\u@\h \W]\$\[\e[0m\]'" >> /etc/profile.d/env.sh source /etc/profile.d/env.sh echo "alias rm='rm –i'" >> ~/.bashrc echo "alias cdnet='cd /etc/sysconfig/network-scripts/'" >> ~/.bashrc echo "alias editnet1='vim /etc/sysconfig/network-scripts/ifcfg-eth0'" >> ~/.bashrc echo "alias editnet2='vim /etc/sysconfig/network-scripts/ifcfg-ens33'" >> ~/.bashrc source .bashrc
49. Search/var_records all the subordinates of mail and the subordinate group is root.
[root@centos7 data]#find /var/ -user root -group mail /var/spool/mail /var/spool/mail/root
50. Find/var_and record all the pieces that do not belong to root, lp and gdm.
[root@centos7 data]#find /var/ -not \( -user root -o -user lp -o -user gdm \) /var/tmp/abrt /var/lib/colord /var/lib/colord/icc
51. Find out that there are no master or group members on the current system and that they have been visited in recent weeks.
[root@centos7 data]#find /var -atime -7 -nouser -o -nogroup
52. Find/var. Record the content of the last week that has been modified, and it is not a postfix or a master not root.
[root@centos7 data]#find /var -mtime -7 -not \( -user root -o -group postfix \) /var/log/cups /var/spool/mail/test /var/spool/mail/bash /var/spool/mail/testbash /var/spool/mail/basher /var/spool/mail/sh /var/spool/mail/nologin /var/spool/mail/wang /var/spool/mail/mage /var/spool/mail/lll /var/spool/mail/aaa /var/spool/mail/aaaaa /var/spool/mail/jiaoyu /var/spool/mail/chen /var/spool/postfix/active /var/spool/postfix/incoming /var/spool/postfix/maildrop /var/spool/postfix/private /var/spool/postfix/public
53. Find/etc. Record all the pieces of 1M and the type is ordinary.
[root@centos7 data]#find /etc/ -size +1M -type f /etc/udev/hwdb.bin /etc/selinux/targeted/active/policy.kern /etc/selinux/targeted/contexts/files/file_contexts.bin /etc/selinux/targeted/policy/policy.31 /etc/brltty/zh-tw.ctb
54. Find / etc and record all households that do not have write permission.
[root@centos7 data]#find /etc/ -not -perm /222 /etc/pki/ca-trust/extracted/java/cacerts /etc/pki/ca-trust/extracted/openssl/ca-bundle.trust.crt /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem /etc/pki/ca-trust/extracted/pem/email-ca-bundle.pem /etc/pki/ca-trust/extracted/pem/objsign-ca-bundle.pem /etc/udev/hwdb.bin /etc/openldap/certs/password /etc/gshadow /etc/shadow /etc/gshadow- /etc/ld.so.conf.d/kernel-3.10.0-957.el7.x86_64.conf /etc/lvm/profile/cache-mq.profile /etc/lvm/profile/cache-smq.profile /etc/lvm/profile/command_profile_template.profile /etc/lvm/profile/lvmdbusd.profile /etc/lvm/profile/metadata_profile_template.profile /etc/lvm/profile/thin-generic.profile /etc/lvm/profile/thin-performance.profile /etc/dbus-1/system.d/cups.conf /etc/pam.d/cups /etc/shadow- /etc/machine-id /etc/sudoers
55. Find / etc and record rare households that do not have the right to hold privileges.
[root@centos7 data]#find /etc/ -not -perm -111
56. Find/etc/init.d. Record, all users have the right to hold the right to write, and other users have the right to write.
[root@centos7 data]#find /etc/init.d/ -perm -113