汇总2022超全必备108道shell脚本面试题

chsh用户名s新> 用户变量由系统用户来生成和定义，变量的值可以通过命令“echo$<变量名>”查看。2>&12>&1如ls/usr/share/docout.txt2>&1&>&>如lsusr/share/doc&>out.txt ifif]if] root@localhost:~#root@localhost:~#lsroot@localhost:~#root@localhost:~#lsls:cannotaccess/usr/bin/share:Nosuchfileordirectoryroot@localhost:~#echo$?2 答：在if-then中使用测试命令（-gt等）if[$x-gt$y]echo“xisgreaterthanecho“yisgreaterthan 答：break命令一个简单的用途是退出执行中的循环。我们可以在while和until循环中使用break出循环。 casecase变量 答：如同for循环，while循环只要条件成立就重复它令块。不同于for循环，while循环会不断迭whilewhile]命令 oda+x bang。它的意思是命令通过/bin/bash forforin 答：使用'-x'参数（sh-xmyscript.sh）可以调试s 。另一个种方法是使用‘-nv’参数(sh-nv 答：下面的表列出了Bourne 第个命令行参数 -d-e-f-r-s-w-x 如果文件存在，返回e #Thisisaecho“Iamloggedinas答：read命令可以来自终端（使用键盘）的数据。read命令得到用户的输入并置于你给出的变量中。例子如下：echo‘Pleaseenteryourreadecho“MyNameis#MyNameisunset变量名##expr5+test=$[16test=$[16+4];test=$[16+答：do-while语句类似于while语句，但检查条件语句之前先执行命令（LCTT译注：意即至少执行一{while条件 答：函数是拥有名字的代码块。当我们定义代码块，我们就可以在我们的调用函数名字，该块就会被执行。示例如下所示：$$diskusage(){df-h; function函数名{[return}1-24 方法方法#echo$RANDOM|md5sum|cut-c1-8方法#opensslrand-base644方法#cat/proc/sys/kernel/random/uuid|cut-c1-8方法方法#echo$RANDOM|cksum|cut-c1-方法#opensslrand-base644|cksum|cut-c1-方法#date+%N|cut-c1-方法方法functionecho_color()if[$1=="green"];elif[$1=="red"];thenecho-e}方法function{case$1inecho-eecho-eecho"Example:echo_colorred}使用方法：echo_colorgreenif[$1=="green"];elif[$1=="red"];thenecho-e}#如果用户文件存在并且大小大于0if[-s$USER_FILE];mv$USER_FILE${USER_FILE}-echo_colorgreen"$USER_FILEexist,rename${USER_FILE}-echo"----------------">>forUSERinuser{1..10};if!id$USER&>/dev/null;PASS=$(echo$RANDOM|md5sum|cut-c1-8)useradd$USERecho$PASS|passwd--stdin$USER&>/dev/nullecho-e"$USER\t$PASS">>$USER_FILEecho"$USERUsercreateecho_colorred"$USERUseralreadyifrpm-qsysstat&>/dev/null;thenecho"sysstatisnotPORT_C=$(ss-anu|grep-cPS_C=$(ps-ef|grepntpd|grep-vcgrep)if[$PORT_C-eq0-o$PS_C-eq0];echo"内容"|mail-s IP_LIST="forIPin$IP_LIST;dowhile[$NUM-le3];if-c1$IP>/dev/null;thenecho"$IPissuccessful."#echo isfailureletif[${#FAIL_COUNT[*]}-eq3echo"${FAIL_COUNT[1]} unsetFAIL_COUNT[*]IP_LIST="forIPin$IP_LIST;dofor((i=1;i<=3;i++)); -c1$IP>/dev/null;thenecho"$IP#echo"$IP isfailure$i"letFAIL_COUNT++if[$FAIL_COUNT-eq3];then is _success_status()if-c1$IP>/dev/null;thenecho"$IPissuccessful."}IP_LIST="forIPin$IP_LIST;echo"$IPisDATE=$(date+%F"IP=$(ifconfigeth0|awk-F'[:]+''/inetaddr/{print$4}')#只支持CentOS6 if!whichvmstat&>/dev/null;echo"vmstatcommandnofound,Pleaseinstallprocpspackage."exit1US=$(vmstat|awk'NR==3{print$13}')SY=$(vmstat|awk'NR==3{print$14}')if[$USE-ge50];thenecho"Host:$IPProblem:CPUutilization"|mail-s"CPUMonitor"DATE=$(date+%F"IP=$(ifconfigeth0|awk-F'[:]+''/inetaddr/{print$4}') -m|awk'/Mem/{print$2}') =$(($TOTAL-#内存小于1G发 if[$ -lt1024];thenecho"Host:$IPProblem:"|mail-s"MemoryMonitor"DATE=$(date+%F"IP=$(ifconfigeth0|awk-F'[:]+''/inetaddr/{print$4}') foriin$PART_USE;doPART=$(echo$i|cut-d"="-f1)USE=$(echo$i|cut-d"="-f2)MOUNT=$(echo$i|cut-d"="-f3)if[$USE-gt80];thenecho"Host:$IPTotal:Problem:"|mail-s"DiskMonitor"forIPin$(awk'/^[^#]/{print$1}'$HOST_INFO);doUSER=$(awk-vip=$IP'ip==$1{print$2}'$HOST_INFO)PORT=$(awk-vip=$IP'ip==$1{print$3}'ssh-p$PORT$USER@$IP'df-h'>USE_RATE_LIST=$(awk'BEGIN{OFS="="}/^\/dev/{print$1,int($5)}'$TMP_FILE)forUSE_RATEin$USE_RATE_LIST;doif[$USE_RATE-ge80];方法方法check_url()HTTP_CODE=$(curl-o/dev/null--connect-timeout3-s-w"%{http_code}"$1)if[$HTTP_CODE-ne200];thenecho"Warning:$1Access}方法check_url()ifwgetT10tries=1spider$1dev/null2>&1;thenecho"Warning:$1Access}方法1：利用循环技巧，如果成功就跳出当前循环，否则执行到最后行方法1：利用循环技巧，如果成功就跳出当前循环，否则执行到最后行HTTP_CODE=$(curl-o/dev/null--connect-timeout3-s-w"%{http_code}"$1)if[$HTTP_CODE-eq200];then} forURLin$URL_LIST;docheck_url$URLcheck_url$URLcheck_url$URLecho"Warning:$URLAccessforURLin$URL_LIST;"forfor((i=1;i<=3;i++));HTTP_CODE=$(curl-o/dev/null--connect-timeout3-s-wif[$HTTP_CODE-ne200];thenletFAIL_COUNT++if[$FAIL_COUNT-eq3];echo"Warning:$URLAccessforURLin$URL_LIST;dowhile[$NUM-le3];"HTTP_CODE=$(curl-o/dev/null--connect-timeout3-s-wif[$HTTP_CODE-ne200];thenletNUM++if[${#FAIL_COUNT[*]}-eq3];thenunset IO_SQL_STATUS=$(mysqlu$USERp$PASSWDeshowslavestatus\G|awkF:'/Slave_.*_Running/{gsub(":",":");print$0}')#gsub去除冒号后面的空格foriin$IO_SQL_STATUS;doif["$THREAD_STATUS"!="Yes"];echo"Error:MySQLMaster-Slave$THREAD_STATUS_NAMEstatus DATE=$(dateABNORMAL_IP=$(tail-n5000access.log|grep$DATE|awk'{a[$1]++}END{for(iina)if(a[i]>100)printi}')forIPin$ABNORMAL_IP;if[$(iptables-vnL|grep-c"$IP")-eq0];theniptables-IINPUT-s$IP-jDROP9]+/,"",$5);{a[$5]++}}END{for(iina)if(a[i]>100)printi}')forIPin$ABNORMAL_IP;if[$(iptables-vnL|grep-c"$IP")-eq0];theniptables-IINPUT-s$IP-jDROPDATE=$(date+"%a%b%e%H:%M")#星期月天时分%e单数字时显示7，而%d显示07forIPin$ABNORMAL_IP;if[$(iptables-vnL|grep-c"$IP")-eq0];theniptables-IINPUT-s$IP-jDROPDATE=$(date+"%b%d'/Failed/{a[$(NF-3)]++}END{for(iina)if(a[i]>5)printi}')"forIPin$ABNORMAL_IP;doif[$(iptables-vnL|grep-c"$IP")-eq0];theniptables-AINPUT-s$IP-jDROPecho"$(date+"%F%T")-iptables-AINPUT-s$IP-jDROP">>~/ssh-login-VALID_CHECK=$(echo$IP|awk-F.'$1<=255&&$2<=255&&$3<=255&&$4<=255{printifecho$IP|grep-E"^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-{1,3}$">/dev/null;if[$VALID_CHECK=="yes"];thenecho"$IPavailable."echo"$IPnotecho"Format}check_ipcheck_ipif[[$IP=~^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$]];FIELD1=$(echo$IP|cut-d.-f1)FIELD2=$(echo$IP|cut-d.-f2)FIELD3=$(echo$IP|cut-d.-f3)FIELD4=$(echo$IP|cut-d.-f4)if[$FIELD1-le255-a$FIELD2-le255-a$FIELD3-le255-a$FIELD4-255];echo"$IPecho"$IPnotecho"Format}}check_ipcheck_ipVALID_CHECK=$(echo$IP|awk-F.'$1<=255&&$2<=255&&$3<=255&&$4<=255{printifecho$IP|grep-E"^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0->/dev/null;if[$VALID_CHECK=="yes"];thenreturn0return1echo"Formaterror!Pleaseinputagain."return1}whiletrue;read-p"PleaseenterIP:"IPcheck_ip$IP[$?-eq0]&&break||if[[$1=~^[0-9]+$]];thenecho"IsNumber."echo"Noif[$1-gt0]2>/dev/null;thenecho"IsNumber."echo"Noecho$1|awk{print$0~/^[0-9]+$/?"IsNumber.":"NoNumber12.14forFILEin$(find$DIR-typef);ifgrep$KEY$FILE&>/dev/null;thenecho"-->$FILE" forFILEin$(find$DIR-typef);ifgrep$KEY$FILE&>/dev/null;thenecho"-->$FILE"Q:39，将新创建的文件名追加到日志 inotifywait-mq--format%f-ecreate$MON_DIR|\whilereadfiles;dofunction{localNUMARRAY_LENGTHNUM=0forNIC_NAMEin$(ls/sys/class/net|grep-vE"lo|docker0");doNIC_IP=$(ifconfig$NIC_NAME|awk-F'[:]+''/inetaddr/{print$4}')if[-n"$NIC_IP"];thenif[-n"$NIC_IP"];thenletif[$ARRAY_LENGTH-eq1];thenreturnelif[$ARRAY_LENGTH-eq0];thenecho"Noavailablenetworkcard!"exit1forNICin${NIC_IP_ARRAY[*]};doecho$NICwhiletrue;#read-p"Pleaseenterlocalusetonetworkcardname:"forNICin${NIC_IP_ARRAY[*]};doif[$NIC_NAME=="$INPUT_NIC_NAME"];thenreturnecho"Notmatch!Pleaseinput}traffic_unit_conv(){localif[$traffic- ];elif[$traffic-lt ];thenprintf"%.1f%s""$(($traffic/1024))"}echo-e" whiletrue;OLD_IN=$(awk-F'[:]+''$0~"'$NIC'"{print$3}'/proc/net/dev)sleep1NEW_IN=$(awk-F'[:]+''$0~"'$NIC'"{print$3}'sleep1Q:42、MySQLcd"ifmysqldump-h$HOST-u$USER-p$PASS--single-transaction--routines--triggersB$DB>$SQL_FILE;zip$BAK_FILE$SQL_FILE&&rm-f$SQL_FILEif[!-s$BAK_FILE];thenecho"$DATE内容"|mail-s "echo"$DATE内容"|mail-s "find$BACKUP_DIR-name'*.zip'-ctime+14-execrm{}场景：使用源码包安装Nginx不含带服务管理，也就是不能使用"servicenginxstart"或"/etc/init.d/nginxstart"，所以写了以下的服务管理。#Description:OnlysupportRedHat./etc/init.d/functionsif[-z"$PID"];thenstop()$DAEMON-sstopsleep1[!-f$PID]&&action"* $NAME"/bin/true||action"*$NAME"}start()sleep[-f$PID]&&action"*Starting$NAME"/bin/true||action"*$NAME"}reload()$DAEMON-s}test_config()$DAEMON-}case"$1"if[!-f$PID];then

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letnum+=1echo$node1$node212arr=(456)arr=(456)INDEX3=$(echo#lsarticle_1.htmlarticle_2.htmlforforfilein$(ls*html);domv$file#mv$file$(echo$file|sed-r's/.*(_.*)/bbs\1/')#mv$file$(echo$file|echobbs_$(cut-d_-f2)forforfilein$(find.-maxdepth1-name"*html");domv$filebbs_${file#*_}##renamearticlebbs ##find.-name"*.html"-execdu-k{}\;|awk'{sum+=$1}END{printforforsizein$(ls-l*.html|awk'{print$5}');doPORT="222580forPORTin$PORT;ifecho&>/dev/null>/dev/tcp/$HOST/$PORT;thenecho"$PORTopen"echo"$PORTQ:51Expect实现SSH expect<<EOFsettimeoutexpect{"password:"{send"$PASS\r"}}expect"$USER@*"{send"$1\r"}expect"$USER@*"{send"exit\r"}expecteofexpect-cexpect{\"(yes/no)\"{send\"yes\r\";\"password:\"{send\"$PASS\r\";\"$USER@*\"{send\"df-h\rexit\r\";#catlogin.exp#catlogin.expsetip[lindex$argv0]setuser[lindex$argv1]setpasswd[lindex$argv2]setcmd[lindex$argv3]if{$argc!=4}{puts"Usage:expectlogin.expipuserpasswd"exit1}settimeout30expect{"password:"{send"$passwd\r"}}expect"$user@*"{send"$cmd\r"}expect"$user@*"{send"exit\r"}expecteofforipin$(awk'{print$1}'$HOST_INFO)user=$(awk-vI="$ip"'I==$1{print$2}'$HOST_INFO)pass=$(awk-vI="$ip"'I==$1{print$3}'$HOST_INFO)expectlogin.exp$ip$user$pass$1#catuser_info.txt#catuser_info.txt#cat1718内容格式：IPUserPasswordPortforIPin$(awk'/^[^#]/{print$1}'$OLD_INFO);doUSER=$(awk-vI=$IP'I==$1{print$2}'$OLD_INFO)PASS=$(awk-vI=$IP'I==$1{print$3}'$OLD_INFO)PORT=$(awk-vI=$IP'I==$1{print$4}'NEW_PASS=$(mkpasswd-l8)# echo expect-c$PORT">>settimeout2expect\"(yes/no)\"{send\"password:\"{send\"$USER@*\"{send\"echo\'$NEW_PASS\'|passwd--stdin$USER\r#catnew_pass.txt17#catnew_pass.txt1718##awk'BEGIN{for(n=0;n++<9;){for(i=0;i++<n;)printfi"x"n"="i*n"";printforfor((i=1;i<=9;i++));getopts是一个解析选项参数的工具。whilegetopts:f:n:option;docase$optionin[!-f$FILE]&&echo"$FILEFilenotexist!"&&sed-n"${OPTARG}p"echo"Usage:$0-f<file_path>-n<line_number>"echo"-f,--file specifiedfile"echo"-n,--line-number exit1作者：Q:54IP=`ifconfigeth0|head-2|tail-1|awk'{print$2}'|awk-F":"ZW=`ifconfigeth0|head-2|tail-1|awk'{print$3}'|awk-F":"GW=`route-n|tail-1|awk'{print$2}'`DNS=`head1/etc/resolv.conf|awk{print$2}'`echo'此机IP地址是'$IPecho'此机网关是'$GWecho此机DNS是 SIZE=`du-shecho"Date:$DAY">>echo"DataSize:$SIZE">>cd/opt/dbbak&>/dev/null||mkdirtarzcf/opt/dbbak/mysqlbak-${DAY}.tar.gz/var/lib/mysql/tmp/dbinfo.txtrm-f5523*/3** #mkdir/mysqlbak#mkdir/mysqlbinlog#mkdir/mysqlbak#mkdir/mysqlbinlogcd/s#viwebdb.shmysql-hlocalhost-uroot-p-e"flushlogs" od+xwebdb.sh#crontab-3023**7 只检查服务vsftdhttpdsshdcrond、mysl如果不是这5个中的服务，就提示用户能够检查的服务名并退出如果服务是运行着的就输出"服务名isrunning"readp请输入你的服务名if[$service!='crond'-a$service!='httpd'-a$service!='sshd'-a!='mysqld'-a$service!='vsftpd'];thenecho只能够检查'vsftpd,httpd,crond,mysqld,sshd"exit5service$servicestatus&>if[$?-eq0];thhenecho"服务 ifif[-z$1echo"Youmastspecifyaservername!"echo"Usage:`basename$0`servername"exit2if[$1=="crond"]||[$1=="mysql"]||[$1=="sshd"]||[$1==]||[$1=="vsftpd"];thenservice$1status&>/dev/nullif[$?-eq0];thenecho"Usage:`basename$0`serverecho"Butonlycheckforvsftpdhttpdsshdcrondmysqld"&&exit2Q:58foriin`seq1012`-c3$ip$i&>/dev/nullif[$?-eq0];then date>>/tmp/ip.txtecho 的主机台数有[root@test1[root@test1scripts]#vimread-p"Enterawebsitedirectory:"webdir echo read-p"Enterdbusername:"dbuserecho$dbuserread-sp"Enterdbuserpassword:"read-p"Enterdbname:"dbnameecho$dbnameread-p"Enterdbtablepre:"dbtablepreecho$dbtablepreGlobalphp=`grepGlobalphp=`grep"tablepre*"th/config_global.php|cut-d"'"-Ucenterphp=`grep"UC_DBTABLEPRE*"$W awk-F"'"'{print$1}'`if[$dbtablepre==$Globalphp]&&[$dbtablepre==$Ucenterphpread-p"Enteryouname:"usersetecho$usersetResult=`$MYsql-u$dbuser-p$dbpass$dbname-e"selectusernamefrom$Prewhereusername='$userset'\G"|cut-d''-f2|tail-1`echoif[$userset==$Resultread-p"Enteryourpassword:"userpasspassnew=`echo-n$userpass|opensslmd5|cut-d''-$MYsql-u$dbuser-p$dbpass$dbname-e"update$Presetpassword='$passnew'whereusername='$userset';"$MYsql-u$dbuser-p$dbpass$dbname-e"flushecho"$usersetisnotrightuser!"exit1exit[root@test1[root@test1scripts]#vimnetstat-tulnp|grep:3306>/dev/nullif[$?-eq0];thenecho服务正在运行-c300&>/dev/nullif[$?-eq0];thenecho网络连接正常echo网络连接失败mysql-h00-uroot-p123456&>/dev/nullif[$?-eq0];thenIO=mysql-uroot-p123-e"showslavestatus\G"|grepSlave_IO_Running|awk'{print$2}'>/dev/nullSQL=mysql-uroot-p123-e"showslavestatus\G"|grepSlave_SQL_Running|awk'{print$2}'/dev/nullif[IO==Yes]&&[SQL==Yesecho“IOandSQL连接成功echoIO线程和SQL线程连接失败"ss_ss_row=`cat_list|wc- -H'Content-Type:application/json "msgtype":"text","text":{"content":}apache_check_80(){ip=$1HTTP_CODE=`curl-o/dev/null-s-w"%{http_code}"if[$HTTP_CODE!=200trans_text\n$ipApache服务器状态异常，网页返回码'"$HTTP_CODE"' }ss_row=`cat_list|wc-fortempin`seq1 Ip_Addr=`cat_list|head-n$temp|tail-napache_check_80sleepwhile["$ip_num"-le"$(expr${#remote_ip[@]}-l)"]ssh"$remote_user"@"${remote_ip[$ip_num]}"df-h>/tmp/diskcheck_tmpgrep'^/dev/*'/tmp/diskcheck_tmp|awk'{print$5}'|sed's/\%//g'while["$read_num"-le$(wc-l</tmp/diskcheck_num_tmp)]size=$(sed-n"$read_num"'p'/tmp/diskcheck_num_tmp)if["size"-gt"$FSMAX"]$(grep'^/dev/*'/tmp/diskcheck_tmp|sed-n>$(echo${remote_ip[$ip_num]})>>$(mail-s"diskcheck_alert"adminread_num=$(expr$read_num+ip_num=$(expr$ip_num+ IP=`ifconfigeth0|grep"inetaddr"|cut-f2-d":"|cut-f1-d""`SPACE=`df-hP|awk'{printint($5)}'`if[$SPACE-ge90]echo"$IP服务器磁盘空间使用率已经超过90%，请及时处理。"|mail-s"$IP：网络技术干货圈#!#!ftp-n<<END_FTPopenusertest//用户名prompt DAY=`dateSIZE=`du-shecho"Date:$DAY">>echo"DataSize:$SIZE">>cd/opt/dbbak&>/dev/null||mkdirtarzcf/opt/dbbak/mysqlbak-${DAY}.tar.gz/var/lib/mysql/tmp/dbinfo.txtrm-f5523*/3**Q:66.declaredeclare-aforiin`seq4049`ary[$i]="echoecho-en"\e[$i;5mdeclare-aforsin`seq110000`foriin`seq4049`ary[$i]="echo-en"\e[$i;5mQ:67.for((i=1;i<12;i++))if[[$i-le6]]for((j=$((12-i));j>i;j--))echo-n"for((m=1;m<=$((2*i-1));m++))echo-n"*echo""elif[[$i-gt6]]for((j=$((12-n));j>n;j--))echo-n"for((m=1;m<=$((2*n-1));m++))echo-n"*echo#!/usr/bin/expect#!/usr/bin/expect-setipaddress[lindex$argvsetpasswd[lindex$argvsettimeoutspawnssh-copy-idexpect"yes/no"{send"yes\r";exp_continue"password:"{send"$passwd\r"}#expect#send"mkdir-p#send#expect#i#命令运行完你要期待个结果结果就是返回提示符了(是#或者"THHP_CODE=`curl-o/dev/null-s-w"%{http_code}"if[$HTTP_CODE!=200echo-e"apache[-f$log]||touchfunction{ip=`echo$line|awk'{print$2}'`ifif[$count-gt100]&&[`iptables-L-n|grep|wc-l`-lt1iptables-IINPUT-s$ip-jDROPecho-e"$list}function{netstat-an|grep"EST"|awk-F'[:]+''{print$6}'|sort|uniq-sleep180} function{if!rpm-qa|grep-q"^$1"yuminstall$1if[$?-eq0]echo-e"$iinstallisecho-e"$1installecho-e"yianzhuang!}forinsinmysqlphphttpdMyInstall declare-aforiin`seq110`echo-e"Array_1:if[${array[$y]}-gt${array[$y+1]}]echo-e"Array_2:arr=("|""/""-""\\"while[$i-le100]letprintf"[%-100s][%d%%][\e[43;46;1m%c\e[0m]\r""$bar""$i""${arr[$index]}"leti++letindex++printf.forUnamein`cat/root/useradd.txt|gawk'{print$1}'`if[$?-eq0]echo-e"这个账号已存在!来源： 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Dat=`date"+%Fif[$disk-ge$dftype]}

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color1file_prepare()if[!-e$filecurl-O$url||{color1"MongoDB数据库文件失败";exit;}install_mongodb()tarxf$file-C$install_dirmkdir-p$db_dirln-s$install_dir/mongodb-linux-x86_64-*echoPATH=$install_dir/mongodb/bin/:'$PATH'>.$db_dir/mongod.log--$?-eq0&&color0"MongoDB数据库安装成功||color1"MongoDB数据库安装}xorg-x11-fonts-Type1firefox[root@centos 检测两台服务器指 下的文件致#通过对比两台服务器上文件的md5值，达到检测致性的目的 find$dir-typef|xargsmd5sum>ssh$b_ip"find$dir-typef|xargsmd5sum>/tmp/md5_b.txt"scp$b_ip:/tmp/md5_b.txt/tmp 比forfin`awk'{print2}ifgrep-qw"$f"/tmp/md5_b.txtmd5_a=`grepw$f"/tmp/md5_a.txt|awk'{print1}'`md5_b=`grepw$f"/tmp/md5_b.txt|awk'{print1}'`#当文件存在时，如果md5值不致则输出文件改变的结果if[$md5_a!=$md5_b]thenecho"$fchanged." logfile=/tmp/`date+%H-%F`.logn=`date+%H`if[$n-eq00]||[$n-eq12] foriin`find/data/log/-typef`foriin`find/data/log/-typef`du-sh$i>>$logfile#检测网卡流量，并按规定格式记录在日志中##2019-08-12#ens33input:1234bps#ens33output:whilelogfile=/tmp/`date exec>>$logfiledate+"%Fsar-nDEV159|grepAverage|grepens33|awkecho#使用awk只输出文档行数（截取第段）n=`wcla.txt|awkprint$1}'`#foriin`seq1n_n=`echo$line|seds'/[^0-9]//'g|wc-L`echo# psaux|grep指定进程名|grepvgrep|awk'{print$2}'|xargskillif[$#-ne1];echo"Usage:$0dir=$(dirname$1)ftpnv nopen0ftp服务器useradminpassword cd$dirwhile[$COUNT-le5];if$INT=~^[0-9]+$thenecho"输入必须是整数！"exitelif$INTgt100thenecho"输入必须是100以内！"exit1[$MIN-lt$INT]&&MIN=$INT[$MAX-gt$INT]&&MAX=$INTletCOUNT++echo"SUM:$SUM"echo"MIN:$MIN"echo"MAX:$MAX#!/bin/bash##!/bin/bash# 生成个100以内的随机数,提示用户猜数字,根据用户的输入,提示用户猜对了,#猜小了或猜大了,直至用户猜对 #RANDOM为系统自带的系统变量,值为0-32767#使用read提示用户猜数字#使用if判断用户猜数字的大小关系:-eq(等于),-ne(不等于),-gt(大于),-ge(大于等于),#-lt(小于),-le(小于等于)readp计算机生成了个1-100的随机数,你猜if[$cai-eq$numelif[$cai-gt$num]echo"Oops,猜大了echo"Oops,猜小了此需要编写，一旦出现502，则自动重启php-fpm服务。 死循环，每10秒检测 次，10秒的日志条数为300条，出现502的比例不低于10%（30条）则需要重#3.重启命令为：/etc/init.d/php-fpmrestart#监测 日志502情况，并做相应动N=30#设定阈值while err=`tail-n300$log|grep-c'502"'`if[$err-ge$N]/etc/init.d/php-fpmrestart2>/dev/null sleepforforiin$(echo"456");doevala$i=$idoneecho$a4$a5foriin$(evalecho$*);do letnum+=1echo$node1$node212方法3：arr=(456)INDEX3=$(echo##touch#lsarticle_1.htmlarticle_2.htmlforforfilein$(ls*html);domv$file#mv$file$(echo$file|sed-r's/.*(_.*)/bbs\1/')#mv$file$(echo$file|echobbs_$(cut-d_-f2)forforfilein$(find.-maxdepth1-name"*html");domv$filebbs_${file#*_}done##renamearticlebbs 第第2行 sed-n'1,5'p2.txt|sed'/[a-zA-sed-n'6,10'p2.txt|seds'/[a-zA-Z]//'gsed-n'11,$'p2.txt ##find.-name"*.html"-execdu-k{}\;|awk'{sum+=$1}END{print方法forsizein$(ls-l*.html|awk'{print$5}');doPORT="222580forPORTin$PORT;ifecho&>/dev/null>/dev/tcp/$HOST/$PORT;thenecho"$PORTopen"echo"$PORT用 #Bashalsointerpretsanumberofmulti-characteroptions. forsinBashalsointerpretsanumberofmulti-characteroptions.if[$n-lt6]echo"*cmd*1-date2-ls3-who4-pwd0-exit"while:read-p"pleaseinputnumber:"nn1=`echo$n|seds'/[0-9]//'g`if[-z"$n"]if[-n"$n1"]exit0case$ninecho"pleaseinputnumberis[1-4]"Q:103、Expect实现SSHexpect<<EOFsettimeout30spawnssh expect"(yes/no)""yes\r"; "password:"{send}expect"$USER@*"{send"$1\r"}expect"$USER@*"{send"exit\r"}expecteofexpect-cexpect{\"(yes/no)\"{send\"yes\r\";\"password:\"{send\"$PASS\r\";\"$USER@*\"{send\"df-h\rexit\r\"; #catlogin.expsetip[lindex$argv0]setuser[lindex$argv1]setpasswd[lindex$argv2]setcmd[lindex$argv3]if{$argc!=4}{puts"Usage:e