shell編程面試必會30題-創(chuàng)新互聯(lián)
來源說明：《跟老男孩學Linux運維》Shell編程實戰(zhàn)
說明:對于每個腳本，用shell編程的同時，我再用python實現(xiàn)，達到同時熟悉兩種腳本語言的目的。由于初學python，有問題還請大家斧正。
面試題1：批量生產隨機字符文件名
用shell實現(xiàn)
代碼：
root@vmUbu:/home/dell/shell# vim creat_ten_htmlfile.sh
#!/bin/bash
#Date: 2017-8-25
#Author: XianWei
Path=/tmp/shelltmp
[ -d "$Path" ] || mkdir -p $Path #如果測試結果為假，就執(zhí)行mkdir語句
cd $Path
for((i=0;i<10;i++)) #循環(huán)執(zhí)行10次
do
namepre=`date +%s|md5sum|tr -dc "a-z"` #生成隨機的10個字母
namepost='_oldboy.html' #文件名的后綴
filename=${namepre}${namepost} #字符串連接
touch $filename
echo "$filename have been created."
sleep 1
done &
wait測試
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
總結：
考察知識點：
1）生成隨機數(shù)的方法
2）字符串連接的方法
使用Python實現(xiàn)
代碼
#encoding:utf-8 import random import os def get10char(): #create 10 random charactors seed = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" sa = [] for i in xrange(10): sa.append(random.choice(seed)) salt = ''.join(sa) return salt def createfile(name): path="/tmp/shelltmp/" #check whether the dir is exists,if not create it if os.path.exists(path) != True: os.mkdir(path) pathAndName=path+name with open(pathAndName,"wb") as f: #create file pass if os.path.exists(pathAndName): print "%s have been created" %name #print the result else: print "create file failed,Please check it." def main(): for i in xrange(10): #loop 10 times to create 10 file filename=get10char()+"_oldboy.html" createfile(filename) if __name__ == "__main__": main()
面試題2：將面試題1中的字符串oldboy全部改為oldgirl
方法一:使用awk生成所需命令，再用bash執(zhí)行
代碼和測試：
root@vmUbu:/tmp/shelltmp# for i in `ls /tmp/shelltmp`;do echo $i|awk -F "_" '{print "mv " $0 " " $1"_oldgirl.html" }' |bash ;done
root@vmUbu:/tmp/shelltmp# ls
adcaeeafbc_oldgirl.html beadcabbbdcbdb_oldgirl.html edffdbddee_oldgirl.html fcaadeaedafbc_oldgirl.html
adddadbc_oldgirl.html deffebcd_oldgirl.html fafbbcdcfcfecef_oldgirl.html
bcadafebdabe_oldgirl.html ecbdeabdaedceb_oldgirl.html fbfdedccbcc_oldgirl.html
root@vmUbu:/tmp/shelltmp#方法2：使用sed替換文件名，再用mv修改文件名
代碼
#!/bin/bash #Date: 2017-8-25 #Author: XianWei Path=/tmp/shelltmp [ -d "$Path" ] || exit 0 #如果測試結果為假，就執(zhí)行mkdir語句 cd $Path for oldfile in `ls $Path/ |grep oldboy` do newfile=`echo $oldfile | sed s/oldboy/oldgirl/g` #生成新的文件名 mv $oldfile $newfile done & wait
測試
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實現(xiàn)
代碼
#encoding:utf-8
import random
import os
import sys
def main():
path="/tmp/shelltmp/"
if os.path.exists(path) !=True: #check the dir whether exists
print "%s not exists,check it." %path
sys.exit(1)
for root,dir,file in os.walk(path): #put the dest file into a list
pass
for oldfilename in file:
if oldfilename.split("_")[1] == "oldboy.html": #if filename include strings "oldboy",change its name
newfilename = oldfilename.split("_")[0]+"_oldgirl.html"
os.rename(path+oldfilename,path+newfilename) #change name
if 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()測試
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#
面試題3：批量創(chuàng)建用戶和密碼
代碼
root@vmUbu:/home/dell/shell# vim 3_create_user.sh
#!/bin/bash
#Date: 2017-8-25
#Author: XianWei
#create ten users in bulk
for((i=0;i<=10;i++))
do
username="oldboy${i}" #cannot use symbol ''
password=`tr -dc "a-zA-Z0-9" </dev/urandom |head -c 8` #create 8 random charactors
#echo $username
useradd $username
echo $username:$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測試
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# #查看密碼文件 root@vmUbu:/home/dell/shell# cat passwd.txt oldboy0 Je28ZqTi oldboy1 LcA5AX3u oldboy2 QF36POh3 oldboy3 5BMoklFp oldboy4 18slv8fB oldboy5 8eIVWck3 oldboy6 ZuWQcqjT oldboy7 lSeahDHM oldboy8 XvqBiFPA oldboy9 VNc8fLZC oldboy10 zdbruc2S
python實現(xiàn)
代碼
#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 random
def get_passwd(n):
passwdlist=[]
seed="abcdefghijkmnopqrstuvwxyz"
for j in xrange(n):
passwdlist.append(random.choice(seed))
passwd = "".join(passwdlist)
return passwd
def create_user(user):
create_user_cmd = 'useradd %s ' %user
p = 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" %user
password=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()測試
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 succussful dgirl5 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#
面試題4：掃描網(wǎng)絡內存活主機
代碼
#!/bin/bash
#Date: 2017-8-26
#Author: XianWei
#check the server whether is alive
ippre='192.168.142.'
cmd='ping -c2 '
for((i=0;i<=20;i++))
do
{
$cmd $ippre$i > /dev/null 2&>1
if [ $? -eq 0 ]
then
echo "$ippre$i is ok"
else
echo "$ippre$i is down"
fi
}& #parallel progress
done
wait #let parent progress wait all child progress測試
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 down real 0m11.229s user 0m0.024s sys 0m0.720s
python實現(xiàn)
代碼
# 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 time
def check_ip(ipaddr):
#函數(shù)用于檢測IP地址合法性。來源：http://blog.csdn.net/jbxue123/article/details/23156011
addr=ipaddr.strip().split('.') #切割IP地址為一個列表
#print addr
if len(addr) != 4: #切割后列表必須有4個參數(shù)
print "%s,ip address is illegal!" %ipaddr
return False
for i in range(4):
try:
addr[i]=int(addr[i]) #每個參數(shù)必須為數(shù)字，否則校驗失敗
except:
print "%s,ip address is illegal!" % ipaddr
return False
if addr[i]<=255 and addr[i]>=0: #每個參數(shù)值必須在0-255之間
pass
else:
print "%s,ip address is illegal!" % ipaddr
return False
#print "check ip address success!"
return True
def ping_host(ip):
if check_ip(ip) == False: #檢測IP合法性
sys.exit(1)
platformOfSystem = platform.system() #根據(jù)平臺，設置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." % ip
else:
print "%s is OK." % ip
if (platform.system() == "Linux"):
pingResult = re.findall("Destination Host Unreachable", res.read())
if (pingResult.__len__() != 0):
print "%s is down." % ip
else:
print "%s is OK." % ip
def main():
print "main threading waiting......"
ip_prefix = "192.168.142." #設置ip列表
iplist = []
n = 10
for i in xrange(1,n + 1):
iplist.append(ip_prefix + str(i))
tlist = []
for i in xrange(len(iplist)): #使用多線程ping
t = Thread(target=ping_host, args=(iplist[i],)) #將線程加入list
tlist.append(t)
for thread in tlist: #啟動所有線程
thread.setDaemon(True)
thread.start()
for thread in tlist: #等待所有線程結束
thread.join()
print "main threading Done"
if __name__ == "__main__":
main()linux平臺測試
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 Done real 0m3.166s user 0m0.100s sys 0m0.296s root@vmUbu:/home/dell/shell#
windows平臺測試
C:\Users\Administrator\PycharmProjects\shell_to_python\0826>python changename.py main 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
面試題10：比較兩個數(shù)大小
要求：輸入兩個數(shù)，比較大小并輸出結果
代碼
#!/bin/bash
#Date: 2017-8-27
#Author: XianWei
#作用:輸入兩個數(shù)，比較大小并輸出結果
#判斷輸入的是否為數(shù)字
function judgenum()
{
if [ $1 -gt -99999999 ] > /dev/null 2>&1 #與一個很小的數(shù)比較
then
echo -n
else
echo "Error,Please input a number"
exit
fi
}
read -p "Please input the first number:" num1
judgenum $num1
read -p "Please input the second number:" num2
judgenum $num2
let res=$num1-$num2
echo $res
[ $res -gt 0 ] && echo "$num1 > $num2"
[ $res -lt 0 ] && echo "$num1 < $num2"
[ $res -eq 0 ] && echo "$num1 = $num2" 測試
dell@vmUbu:~/shell$ 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$
知識點
1）如何判斷輸入的是一個整數(shù)。除了本例中的方法還可以使用expr,比如expr num + 1,如果返回值$?為0表示輸入的是一個數(shù)。否則不是一個數(shù)，返回錯誤并退出
使用Python實現(xiàn)
代碼
# encoding:utf-8 import sys num1 = 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)
未完待續(xù).......
另外有需要云服務器可以了解下創(chuàng)新互聯(lián)scvps.cn，海內外云服務器15元起步，三天無理由+7*72小時售后在線，公司持有idc許可證，提供“云服務器、裸金屬服務器、高防服務器、香港服務器、美國服務器、虛擬主機、免備案服務器”等云主機租用服務以及企業(yè)上云的綜合解決方案，具有“安全穩(wěn)定、簡單易用、服務可用性高、性價比高”等特點與優(yōu)勢，專為企業(yè)上云打造定制，能夠滿足用戶豐富、多元化的應用場景需求。
本文標題：shell編程面試必會30題-創(chuàng)新互聯(lián)
分享URL：http://muchs.cn/article10/pdhdo.html
成都網(wǎng)站建設公司_創(chuàng)新互聯(lián)，為您提供網(wǎng)站改版、微信公眾號、關鍵詞優(yōu)化、網(wǎng)站內鏈、做網(wǎng)站、營銷型網(wǎng)站建設
聲明：本網(wǎng)站發(fā)布的內容（圖片、視頻和文字）以用戶投稿、用戶轉載內容為主，如果涉及侵權請盡快告知，我們將會在第一時間刪除。文章觀點不代表本網(wǎng)站立場，如需處理請聯(lián)系客服。電話：028-86922220；郵箱：631063699@qq.com。內容未經(jīng)允許不得轉載，或轉載時需注明來源： 創(chuàng)新互聯(lián)
猜你還喜歡下面的內容
- 手機網(wǎng)站建設時應該注意的地方有哪些? 2014-03-17
- 如何建設手機網(wǎng)站才能抓住客戶 2016-10-26
- 手機版企業(yè)網(wǎng)站建設的一些常見功能點 2016-11-04
- 手機網(wǎng)站建設所需要注意的七點問題建站之前必須了解！ 2022-10-16
- 成都網(wǎng)頁設計：手機客戶端應該怎樣推廣網(wǎng)絡營 2016-11-12
- 企業(yè)之手機建站的重要性 2016-11-06
- 手機網(wǎng)站建設的技巧有哪些 以下幾點值得注意 2016-11-17
- 手機網(wǎng)站建設的營銷思路及發(fā)展方向 2022-05-29
- 如何做好手機網(wǎng)站建設和推廣工作 2022-06-18
- 手機網(wǎng)站建設對網(wǎng)站推廣有什么影響？ 2016-11-09
- 企業(yè)網(wǎng)站建設有哪些流程？手機建站需要注意什么？ 2016-11-07
- 手機網(wǎng)站建設時需要注意的事項有哪些？ 2022-05-13