shell编程面试必会30题
2024-05-29 05:10:59
来源说明：《跟老男孩学Linux运维》Shell编程实战
说明:对于每个脚本，用shell编程的同时，我再用python实现，达到同时熟悉两种脚本语言的目的。由于初学python，有问题还请大家斧正。
面试题1：批量生产随机字符文件名
用shell实现
代码：
root@vmUbu:/home/dell/shell# vim creat_ten_htmlfile.sh
#!/bin/bash#Date: 2017-8-25
#Author: XianWeiPath=/tmp/shelltmp
[ -d "$Path" ] || mkdir -p $Path #如果测试结果为假，就执行mkdir语句
cd $Path
for((i=0;i<10;i++)) #循环执行10次
donamepre=`date +%s|md5sum|tr -dc "a-z"` #生成随机的10个字母namepost='_oldboy.html' #文件名的后缀filename=${namepre}${namepost} #字符串连接touch $filenameecho "$filename have been created."sleep 1done &
wait
测试
root@vmUbu:/home/dell/shell# ./creat_ten_htmlfile.sh adcaeeafbc_oldboy.html have been created. ecbdeabdaedceb_oldboy.html have been created. edffdbddee_oldboy.html have been created. beadcabbbdcbdb_oldboy.html have been created. fcaadeaedafbc_oldboy.html have been created. adddadbc_oldboy.html have been created. bcadafebdabe_oldboy.html have been created. deffebcd_oldboy.html have been created. fafbbcdcfcfecef_oldboy.html have been created. fbfdedccbcc_oldboy.html have been created. root@vmUbu:/home/dell/shell# root@vmUbu:/home/dell/shell# ll /tmp/shelltmp/ total 8 drwxr-xr-x 2 root root 4096 Aug 25 07:53 ./ drwxrwxrwt 15 root root 4096 Aug 25 08:05 ../ -rw-r--r-- 1 root root 0 Aug 25 07:53 adcaeeafbc_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 07:53 adddadbc_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 07:53 bcadafebdabe_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 07:53 beadcabbbdcbdb_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 07:53 deffebcd_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 07:53 ecbdeabdaedceb_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 07:53 edffdbddee_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 07:53 fafbbcdcfcfecef_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 07:53 fbfdedccbcc_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 07:53 fcaadeaedafbc_oldboy.html
总结：
考察知识点：
1）生成随机数的方法
2）字符串连接的方法
使用Python实现
代码
#encoding:utf-8import random
import osdef get10char(): #create 10 random charactorsseed = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"sa = []for i in xrange(10):sa.append(random.choice(seed))salt = ''.join(sa)return saltdef createfile(name):path="/tmp/shelltmp/" #check whether the dir is exists,if not create itif os.path.exists(path) != True:os.mkdir(path)pathAndName=path+namewith open(pathAndName,"wb") as f: #create filepassif os.path.exists(pathAndName):print "%s have been created" %name #print the resultelse:print "create file failed,Please check it."def main():for i in xrange(10): #loop 10 times to create 10 filefilename=get10char()+"_oldboy.html"createfile(filename)if __name__ == "__main__":main()面试题2：将面试题1中的字符串oldboy全部改为oldgirl
方法一:使用awk生成所需命令，再用bash执行
代码和测试：
root@vmUbu:/tmp/shelltmp# for i in `ls /tmp/shelltmp`;do echo $i|awk -F "_" '{print "mv " $0 " " $1"_oldgirl.html" }' |bash ;doneroot@vmUbu:/tmp/shelltmp# ls
adcaeeafbc_oldgirl.html beadcabbbdcbdb_oldgirl.html edffdbddee_oldgirl.html fcaadeaedafbc_oldgirl.html
adddadbc_oldgirl.html deffebcd_oldgirl.html fafbbcdcfcfecef_oldgirl.html
bcadafebdabe_oldgirl.html ecbdeabdaedceb_oldgirl.html fbfdedccbcc_oldgirl.html
root@vmUbu:/tmp/shelltmp#
方法2：使用sed替换文件名，再用mv修改文件名
代码
#!/bin/bash#Date: 2017-8-25 #Author: XianWeiPath=/tmp/shelltmp [ -d "$Path" ] || exit 0 #如果测试结果为假，就执行mkdir语句 cd $Pathfor oldfile in `ls $Path/ |grep oldboy` donewfile=`echo $oldfile | sed s/oldboy/oldgirl/g` #生成新的文件名mv $oldfile $newfiledone & wait
测试
root@vmUbu:/home/dell/shell# python 1_creat_ten_htmlfile.py WKfqYfUprf_oldboy.html have been created QplbhAZVZA_oldboy.html have been created jmkkmepTfD_oldboy.html have been created IAeFZLHzOj_oldboy.html have been created DwWbMsCqtN_oldboy.html have been created ZgAVXNCyLQ_oldboy.html have been created DBENsfnZpv_oldboy.html have been created PveegnMyBo_oldboy.html have been created MpReSrwXJr_oldboy.html have been created SWWFrkYhdi_oldboy.html have been created root@vmUbu:/home/dell/shell# root@vmUbu:/home/dell/shell# ll /tmp/shelltmp/ total 8 drwxr-xr-x 2 root root 4096 Aug 25 11:32 ./ drwxrwxrwt 16 root root 4096 Aug 25 11:32 ../ -rw-r--r-- 1 root root 0 Aug 25 11:32 DBENsfnZpv_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 11:32 DwWbMsCqtN_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 11:32 IAeFZLHzOj_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 11:32 jmkkmepTfD_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 11:32 MpReSrwXJr_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 11:32 PveegnMyBo_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 11:32 QplbhAZVZA_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 11:32 SWWFrkYhdi_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 11:32 WKfqYfUprf_oldboy.html -rw-r--r-- 1 root root 0 Aug 25 11:32 ZgAVXNCyLQ_oldboy.html root@vmUbu:/home/dell/shell#
python实现
代码
#encoding:utf-8import random
import os
import sysdef main():path="/tmp/shelltmp/"if os.path.exists(path) !=True: #check the dir whether existsprint "%s not exists,check it." %pathsys.exit(1)for root,dir,file in os.walk(path): #put the dest file into a listpassfor oldfilename in file:if oldfilename.split("_")[1] == "oldboy.html": #if filename include strings "oldboy",change its namenewfilename = oldfilename.split("_")[0]+"_oldgirl.html" os.rename(path+oldfilename,path+newfilename) #change nameif os.path.exists(path+newfilename): #print the result print "%s have been change name to %s" %(oldfilename,newfilename)else:print "%s changed name failed." %(oldfilename)if __name__ == "__main__":main()测试
root@vmUbu:/home/dell/shell# ls /tmp/shelltmp/ COFoqgRped_oldboy.html FnlInKOFDD_oldboy.html KraoAAesrC_oldboy.html LFCkswpeJc_oldboy.html RXwWPTAYTF_oldboy.html dxTHbQyYyZ_oldboy.html ickDGJUVgD_oldboy.html LBbLaTnuRW_oldboy.html ReFkjxYZjO_oldboy.html tKwmVefsCP_oldboy.html root@vmUbu:/home/dell/shell# python 2_change_name.py LFCkswpeJc_oldboy.html have been change name to LFCkswpeJc_oldgirl.html dxTHbQyYyZ_oldboy.html have been change name to dxTHbQyYyZ_oldgirl.html FnlInKOFDD_oldboy.html have been change name to FnlInKOFDD_oldgirl.html RXwWPTAYTF_oldboy.html have been change name to RXwWPTAYTF_oldgirl.html COFoqgRped_oldboy.html have been change name to COFoqgRped_oldgirl.html ReFkjxYZjO_oldboy.html have been change name to ReFkjxYZjO_oldgirl.html LBbLaTnuRW_oldboy.html have been change name to LBbLaTnuRW_oldgirl.html tKwmVefsCP_oldboy.html have been change name to tKwmVefsCP_oldgirl.html KraoAAesrC_oldboy.html have been change name to KraoAAesrC_oldgirl.html ickDGJUVgD_oldboy.html have been change name to ickDGJUVgD_oldgirl.html root@vmUbu:/home/dell/shell# ls /tmp/shelltmp/ COFoqgRped_oldgirl.html FnlInKOFDD_oldgirl.html KraoAAesrC_oldgirl.html LFCkswpeJc_oldgirl.html RXwWPTAYTF_oldgirl.html dxTHbQyYyZ_oldgirl.html ickDGJUVgD_oldgirl.html LBbLaTnuRW_oldgirl.html ReFkjxYZjO_oldgirl.html tKwmVefsCP_oldgirl.html root@vmUbu:/home/dell/shell#
面试题3：批量创建用户和密码
代码
root@vmUbu:/home/dell/shell# vim 3_create_user.sh #!/bin/bash#Date: 2017-8-25
#Author: XianWei
#create ten users in bulkfor((i=0;i<=10;i++))
dousername="oldboy${i}" #cannot use symbol ''password=`tr -dc "a-zA-Z0-9" </dev/urandom |head -c 8` #create 8 random charactors#echo $username useradd $usernameecho $username:$password |chpasswd #change passwd.if os=centos,use passwd --stdin#echo ${username}" "${password} echo ${username}" "${password} >> passwd.txt #record the username and it's password
done
测试
root@vmUbu:/home/dell/shell# ./3_create_user.sh root@vmUbu:/home/dell/shell# cat /etc/passwd ...... hello:x:1001:1001::/home/hello: oldboy0:x:1002:1002::/home/oldboy0: oldboy1:x:1003:1003::/home/oldboy1: oldboy2:x:1004:1004::/home/oldboy2: oldboy3:x:1005:1005::/home/oldboy3: oldboy4:x:1006:1006::/home/oldboy4: oldboy5:x:1007:1007::/home/oldboy5: oldboy6:x:1008:1008::/home/oldboy6: oldboy7:x:1009:1009::/home/oldboy7: oldboy8:x:1010:1010::/home/oldboy8: oldboy9:x:1011:1011::/home/oldboy9: oldboy10:x:1012:1012::/home/oldboy10: root@vmUbu:/home/dell/shell# #查看密码文件 root@vmUbu:/home/dell/shell# cat passwd.txt oldboy0 Je28ZqTi oldboy1 LcA5AX3u oldboy2 QF36POh2 oldboy3 5BMoklFp oldboy4 18slv8fB oldboy5 8eIVWck3 oldboy6 ZuWQcqjT oldboy7 lSeahDHM oldboy8 XvqBiFPA oldboy9 VNc8fLZC oldboy10 zdbruc2S
python实现
代码
#encoding:utf-8'''
#date: 2017-8-26
#Author: XianWei from ChengDu
#scripte Function: create users and set its password in bulk
'''
import random
import os
import sys
import subprocess
import randomdef get_passwd(n):passwdlist=[]seed="abcdefghijkmnopqrstuvwxyz"for j in xrange(n):passwdlist.append(random.choice(seed))passwd = "".join(passwdlist)return passwddef create_user(user):create_user_cmd = 'useradd %s ' %userp = subprocess.Popen(args=create_user_cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, close_fds=True)returncode = p.wait()if returncode == 0:print "useradd %s succussful" %userpassword=get_passwd(8)set_passwd_cmd = 'echo %s:%s |chpasswd' %(user,password)p2 = subprocess.Popen(args=set_passwd_cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, close_fds=True)returncode_p2 = p2.wait()if returncode_p2 == 0:print "%s set password succussful.its password : %s" %(user,password)else:print "sorry,set password failed!"else:print "useradd failed."sys.exit(1)def main():userlist = []for i in xrange(1,11):userlist.append("oldgirl"+str(i))for user in userlist:create_user(user)if __name__ == "__main__":main()测试
root@vmUbu:/home/dell/shell# python 3_create_user.py useradd oldgirl1 succussful oldgirl1 set password succussful.its password : qtcvheyq useradd oldgirl2 succussful oldgirl2 set password succussful.its password : wnaecfxu useradd oldgirl3 succussful oldgirl3 set password succussful.its password : wpxwtcvv useradd oldgirl4 succussful oldgirl4 set password succussful.its password : cpquxwzd useradd oldgirl5 succussfuldgirl5 set password succussful.its password : gdtmttug useradd oldgirl6 succussful oldgirl6 set password succussful.its password : eznjdjow useradd oldgirl7 succussful oldgirl7 set password succussful.its password : eysxegpu useradd oldgirl8 succussful oldgirl8 set password succussful.its password : yhdkrdyb useradd oldgirl9 succussful oldgirl9 set password succussful.its password : omytwhdh useradd oldgirl10 succussful oldgirl10 set password succussful.its password : zpenokqg root@vmUbu:/home/dell/shell# root@vmUbu:/home/dell/shell# cat /etc/passwd |grep oldgirl oldgirl1:x:1013:1013::/home/oldgirl1: oldgirl2:x:1014:1014::/home/oldgirl2: oldgirl3:x:1015:1015::/home/oldgirl3: oldgirl4:x:1016:1016::/home/oldgirl4: oldgirl5:x:1017:1017::/home/oldgirl5: oldgirl6:x:1018:1018::/home/oldgirl6: oldgirl7:x:1019:1019::/home/oldgirl7: oldgirl8:x:1020:1020::/home/oldgirl8: oldgirl9:x:1021:1021::/home/oldgirl9: oldgirl10:x:1022:1022::/home/oldgirl10: root@vmUbu:/home/dell/shell#
面试题4：扫描网络内存活主机
代码
#!/bin/bash#Date: 2017-8-26
#Author: XianWei
#check the server whether is aliveippre='192.168.142.'
cmd='ping -c2 'for((i=0;i<=20;i++))
do
{$cmd $ippre$i > /dev/null 2&>1if [ $? -eq 0 ]thenecho "$ippre$i is ok"elseecho "$ippre$i is down"fi
}& #parallel progress
done
wait #let parent progress wait all child progress
测试
root@vmUbu:/home/dell/shell# time ./4_ping_host.sh 192.168.142.0 is down 192.168.142.2 is ok 192.168.142.11 is down 192.168.142.20 is down 192.168.142.4 is down 192.168.142.12 is down 192.168.142.3 is down 192.168.142.9 is down 192.168.142.18 is down 192.168.142.5 is down 192.168.142.15 is down 192.168.142.13 is down 192.168.142.16 is down 192.168.142.17 is down 192.168.142.10 is down 192.168.142.14 is down 192.168.142.6 is down 192.168.142.19 is down 192.168.142.1 is down 192.168.142.7 is down 192.168.142.8 is downreal 0m11.229s user 0m0.024s sys 0m0.720s
python实现
代码
# encoding:utf-8'''
#date: 2017-8-26
#Author: XianWei from ChengDu
#scripte Function: check ip whether is alived in bulk
'''
import random
import os
import sys
import subprocess
import random
import platform
import re
from threading import Thread
from Queue import Queue
import timedef check_ip(ipaddr):#函数用于检测IP地址合法性。来源：http://blog.csdn.net/jbxue123/article/details/23156011addr=ipaddr.strip().split('.') #切割IP地址为一个列表#print addrif len(addr) != 4: #切割后列表必须有4个参数print "%s,ip address is illegal!" %ipaddrreturn Falsefor i in range(4):try:addr[i]=int(addr[i]) #每个参数必须为数字，否则校验失败except:print "%s,ip address is illegal!" % ipaddrreturn Falseif addr[i]<=255 and addr[i]>=0: #每个参数值必须在0-255之间passelse:print "%s,ip address is illegal!" % ipaddrreturn False#print "check ip address success!"return Truedef ping_host(ip):if check_ip(ip) == False: #检测IP合法性sys.exit(1)platformOfSystem = platform.system() #根据平台，设置ping命令if (platformOfSystem == "Windows"):cmd = "ping -n 2 %s" % (ip)if (platformOfSystem == "Linux"):cmd = "ping -c 2 %s" % (ip)res = os.popen(cmd)if (platform.system() == "Windows"):if (re.findall("Lost = 2", res.read()).__len__() != 0):print "%s is down." % ipelse:print "%s is OK." % ipif (platform.system() == "Linux"):pingResult = re.findall("Destination Host Unreachable", res.read())if (pingResult.__len__() != 0):print "%s is down." % ipelse:print "%s is OK." % ipdef main():print "main threading waiting......"ip_prefix = "192.168.142." #设置ip列表iplist = []n = 10for i in xrange(1,n + 1):iplist.append(ip_prefix + str(i))tlist = []for i in xrange(len(iplist)): #使用多线程pingt = Thread(target=ping_host, args=(iplist[i],)) #将线程加入listtlist.append(t)for thread in tlist: #启动所有线程thread.setDaemon(True)thread.start()for thread in tlist: #等待所有线程结束thread.join()print "main threading Done"if __name__ == "__main__":main()linux平台测试
root@vmUbu:/home/dell/shell# time python 4_ping_host.py main threading waiting...... 192.168.142.1 is OK. 192.168.142.2 is OK. 192.168.142.3 is down. 192.168.142.6 is down. 192.168.142.4 is down. 192.168.142.5 is down. 192.168.142.7 is down.192.168.142.8 is down. 192.168.142.9 is down. 192.168.142.10 is down. main threading Donereal 0m3.166s user 0m0.100s sys 0m0.296s root@vmUbu:/home/dell/shell#
windows平台测试
C:\Users\Administrator\PycharmProjects\shell_to_python\0826>python changename.pymain threading waiting...... 192.168.142.1 is OK. 192.168.142.3 is down. 192.168.142.6 is down. 192.168.142.9 is down.192.168.142.4 is down. 192.168.142.7 is down. 192.168.142.8 is down.192.168.142.5 is down. 192.168.142.2 is OK.192.168.142.10 is down.main threading Done
面试题10：比较两个数大小
要求：输入两个数，比较大小并输出结果
代码
#!/bin/bash#Date: 2017-8-27
#Author: XianWei
#作用:输入两个数，比较大小并输出结果#判断输入的是否为数字
function judgenum()
{if [ $1 -gt -99999999 ] > /dev/null 2>&1 #与一个很小的数比较thenecho -nelseecho "Error,Please input a number"exitfi
}read -p "Please input the first number:" num1
judgenum $num1
read -p "Please input the second number:" num2
judgenum $num2let res=$num1-$num2
echo $res[ $res -gt 0 ] && echo "$num1 > $num2"
[ $res -lt 0 ] && echo "$num1 < $num2"
[ $res -eq 0 ] && echo "$num1 = $num2"
测试
dell@vmUbu:~/shell$ bash judgenum.sh Please input the first number:1 Please input the second number:b Error,Please input a number dell@vmUbu:~/shell$ bash judgenum.sh Please input the first number:a Error,Please input a number dell@vmUbu:~/shell$ dell@vmUbu:~/shell$ dell@vmUbu:~/shell$ dell@vmUbu:~/shell$ bash judgenum.sh Please input the first number:2 Please input the second number:2 2 = 2 dell@vmUbu:~/shell$ bash judgenum.sh Please input the first number:2 Please input the second number:3 2 < 3 dell@vmUbu:~/shell$ bash judgenum.sh Please input the first number:2 Please input the second number:1 2 > 1 dell@vmUbu:~/shell$
知识点
1）如何判断输入的是一个整数。除了本例中的方法还可以使用expr,比如expr num + 1,如果返回值$?为0表示输入的是一个数。否则不是一个数，返回错误并退出
使用Python实现
代码
# encoding:utf-8import sysnum1 = raw_input()
try:num1 = int(num1)
except:print "Error ,please input a number."sys.exit(2)num2 = raw_input()
try:num2 = int(num2)
except:print "Error ,please input a number."sys.exit(2)if(num1>num2):print "%d>%d" %(num1,num2)
else:if(num1<num2):print "%d<%d" % (num1, num2)else:print "%d=%d" % (num1, num2)未完待续.......
转载于:https://blog.51cto.com/237085/1959480
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