\n| \n for ((\u53d8\u91cf;\u6761\u4ef6;\u8fd0\u7b97))<\/p>\n do<\/p>\n \u547d\u4ee4\u5e8f\u5217<\/p>\n done<\/p>\n<\/td>\n | \n \u5339\u914d\u6761\u4ef6\u65f6\u5faa\u73af\u6267\u884c\u52a8\u4f5c；<\/p>\n \u5148\u521d\u59cb\u5316\u53d8\u91cf\u503c，\u518d\u6267\u884c\u8fd0\u7b97\u64cd\u4f5c，\u6700\u540e\u901a\u8fc7\u6761\u4ef6\u5224\u65ad\u662f\u5426\u6267\u884c<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/p>\n 1\u3001\u5224\u65ad\u8be5\u7528\u6237\u662f\u5426\u5b58\u5728，\u4e0d\u5b58\u5728\u5219\u521b\u5efa<\/p>\n [root@wuzuniao ~]# vim 4.txt #\u521b\u5efa\u7528\u6237\u5217\u8868，\u6bcf\u4e2a\u7528\u6237\u5355\u72ec\u4e00\u884c<\/p>\n a<\/p>\n b<\/p>\n c<\/p>\n [root@wuzuniao ~]# vim 4.sh<\/p>\n #!\/bin\/bash<\/p>\n read -p "Enter The Users Password : " PASSWD #\u7528read\u83b7\u53d6\u8f93\u5165\u7684\u5bc6\u7801\u503c，\u8d4b\u503c\u7ed9PASSWD\u53d8\u91cf；-p\u53ef\u663e\u793a\u63d0\u793a\u4fe1\u606f<\/p>\n for UNAME in `4.txt`<\/p>\n do<\/p>\n id $UNAME &> \/dev\/null #\u67e5\u770b\u7528\u6237\u4fe1\u606f，\u6267\u884c\u6210\u529f\u7ed3\u679c\u4e3a0，\u5931\u8d25\u4e3a\u975e0，\u65b9\u4fbf\u4e0b\u9762\u7528$?\u53d8\u91cf\u5224\u65ad；\/dev\/null\u4e3a\u9ed1\u6d1e\u6587\u4ef6，\u8f93\u51fa\u5230\u91cc\u9762\u4fe1\u606f\u90fd\u4f1a\u6d88\u5931，\u907f\u514d\u6267\u884c\u7ed3\u679c\u56de\u663e\u5230\u6807\u51c6\u8f93\u51fa<\/p>\n if [ $? -eq 0 ]<\/p>\n then<\/p>\n echo "$UNAME , Already exists"<\/p>\n else<\/p>\n useradd $UNAME<\/p>\n echo "$PASSWD" | passwd –stdin $UNAME &> \/dev\/null<\/p>\n echo "$UNAME , Create success"<\/p>\n fi<\/p>\n done<\/p>\n [root@wuzuniao ~]# bash 4.sh #\u6267\u884c\u811a\u672c<\/p>\n Enter The Users Password : 1 #\u8f93\u5165\u5bc6\u7801<\/p>\n a , Create success<\/p>\n b , Create success<\/p>\n c , Create success<\/p>\n [root@wuzuniao ~]# tail -3 \/etc\/passwd #\u67e5\u770b\u6700\u65b0\u7684\u8d26\u53f7\u4fe1\u606f，\u53ef\u4ee5\u770b\u5230\u81ea\u52a8\u5efa\u597d\u4e86<\/p>\n a:x:1001:1001::\/home\/a:\/bin\/bash<\/p>\n b:x:1002:1002::\/home\/b:\/bin\/bash<\/p>\n c:x:1003:1003::\/home\/c:\/bin\/bash<\/p>\n [root@wuzuniao ~]#<\/p>\n<\/p>\n 2\u3001\u6279\u91cf\u6d4b\u8bd5\u4e3b\u673a\u662f\u5426\u5728\u7ebf<\/p>\n [root@wuzuniao ~]# vim 5.txt #\u521b\u5efa\u4e3b\u673a\u5217\u8868\u6587\u4ef6，\u6bcf\u4e2a\u5730\u5740\u5355\u72ec\u4e00\u884c<\/p>\n 192.168.1.1<\/p>\n 192.168.1.2<\/p>\n 192.168.1.3<\/p>\n [root@wuzuniao ~]# vim 5.sh<\/p>\n #!\/bin\/bash<\/p>\n HLIST=$(cat ~\/5.txt) #\u4ece\u6587\u4ef6\u4e2d\u8bfb\u53d6IP\u5730\u5740\u5e76\u8d4b\u503c\u7ed9HLIST\u53d8\u91cf<\/p>\n for IP in $HLIST<\/p>\n do<\/p>\n ping -c 3 -i 0.2 -W 3 $IP &> \/dev\/null #\u901a\u8fc7ping\u547d\u4ee4\u7684\u8fd4\u56de\u503c\u6765\u6d4b\u8bd5\u4e3b\u673a\u662f\u5426\u5728\u7ebf，\u6210\u529f\u4e3a0，\u662f\u5426\u88ab\u975e0<\/p>\n if [ $? -eq 0 ]<\/p>\n then<\/p>\n echo "Host $IP is On-line."<\/p>\n else<\/p>\n echo "Host $IP is Off-line."<\/p>\n fi<\/p>\n done<\/p>\n [root@wuzuniao ~]# bash 5.sh #\u6267\u884c\u811a\u672c<\/p>\n Host 192.168.1.1 is On-line.<\/p>\n Host 192.168.1.2 is Off-line.<\/p>\n Host 192.168.1.3 is On-line.<\/p>\n [root@wuzuniao ~]#<\/p>\n<\/p>\n 3\u3001\u7ed9\u53d8\u91cf\u8d4b\u503c\u5e76\u8f93\u51fa\u6bcf\u6b21\u8d4b\u7684\u503c<\/p>\n [root@wuzuniao ~]# vim 6.sh #\u7ed9\u53d8\u91cf\u8d4b\u503c\u5e76\u8f93\u51fa\u6bcf\u6b21\u8d4b\u7684\u503c<\/p>\n #!\/bin\/bash<\/p>\n for A in {2..6}<\/p>\n do<\/p>\n echo $A;<\/p>\n done<\/p>\n [root@wuzuniao ~]# bash 6.sh #\u6267\u884c\u811a\u672c<\/p>\n 2<\/p>\n 3<\/p>\n 4<\/p>\n 5<\/p>\n 6<\/p>\n [root@wuzuniao ~]#<\/p>\n<\/p>\n 4\u3001\u8f93\u51fa99\u4e58\u6cd5\u8868<\/p>\n [root@wuzuniao ~]# vim 9.sh #\u8f93\u51fa99\u4e58\u6cd5\u8868<\/p>\n #!\/bin\/bash<\/p>\n for i in {1..9}<\/p>\n do<\/p>\n for ((j=1;j<\/p>\n do<\/p>\n printf "%-8s" $j*$i=$((j*i))<\/p>\n done<\/p>\n echo<\/p>\n done<\/p>\n [root@wuzuniao ~]# bash 9.sh #\u6267\u884c\u811a\u672c<\/p>\n 1*1=1<\/p>\n 1*2=2 2*2=4<\/p>\n 1*3=3 2*3=6 3*3=9<\/p>\n 1*4=4 2*4=8 3*4=12 4*4=16<\/p>\n 1*5=5 2*5=10 3*5=15 4*5=20 5*5=25<\/p>\n 1*6=6 2*6=12 3*6=18 4*6=24 5*6=30 6*6=36<\/p>\n 1*7=7 2*7=14 3*7=21 4*7=28 5*7=35 6*7=42 7*7=49<\/p>\n 1*8=8 2*8=16 3*8=24 4*8=32 5*8=40 6*8=48 7*8=56 8*8=64<\/p>\n 1*9=9 2*9=18 3*9=27 4*9=36 5*9=45 6*9=54 7*9=63 8*9=72 9*9=81<\/p>\n [root@wuzuniao ~]#<\/p>\n","protected":false},"excerpt":{"rendered":" \u201c \u76ee\u5f55：RHCA -> 5 Shell\u811a\u672c -> 12 for\u5faa\u73af\u00a0\u201d\u5faa\u73af\u8bed\u53e5\u7528\u6765\u591a\u6b21\u91cd\u590d\u6267\u884c\u76f8\u540c\u7684\u547d\u4ee4\u6267\u884c\u524d\u9700\u8981\u7ed9\u53d8\u91cf\u8d4b\u503c，\u6ee1\u8db3\u5224\u65ad\u6761\u4ef6\u65f6\u624d\u4f1a\u6267\u884c\u8bed\u6cd5\u683c\u5f0f\u4f5c\u7528for \u53d8\u91cf\u540d in \u503c1 \u503c2 .. \u503cNdo\u547d\u4ee4\u5e8f\u5217done\u5339\u914d\u6761\u4ef6\u65f6\u5faa\u73af\u6267\u884c\u52a8\u4f5c；\u76f4\u63a5\u7ed9\u53d8\u91cf\u8d4b\u503c\u65f6，\u8d4b\u503c\u7684\u6b21\u6570\u5c31\u662f\u5faa\u73af\u7684\u6b21\u6570；\u591a\u4e2a\u503c\u4e4b\u95f4\u7528\u7a7a\u683c\u5206\u9694；for ((\u53d8\u91cf;\u6761\u4ef6;\u8fd0\u7b97))do\u547d\u4ee4\u5e8f\u5217done\u5339\u914d\u6761\u4ef6\u65f6\u5faa\u73af\u6267\u884c\u52a8\u4f5c&#x<\/p>\n","protected":false},"author":2,"featured_media":92212,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[58],"topic":[],"class_list":["post-92213","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-linux"],"yoast_head":"\n \u3010RHCA+\u3011for\u5faa\u73af - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/92213.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010RHCA+\u3011for\u5faa\u73af - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u201c \u76ee\u5f55：RHCA -> 5 Shell\u811a\u672c -> 12 for\u5faa\u73af\u00a0\u201d\u5faa\u73af\u8bed\u53e5\u7528\u6765\u591a\u6b21\u91cd\u590d\u6267\u884c\u76f8\u540c\u7684\u547d\u4ee4\u6267\u884c\u524d\u9700\u8981\u7ed9\u53d8\u91cf\u8d4b\u503c，\u6ee1\u8db3\u5224\u65ad\u6761\u4ef6\u65f6\u624d\u4f1a\u6267\u884c\u8bed\u6cd5\u683c\u5f0f\u4f5c\u7528for \u53d8\u91cf\u540d in \u503c1 \u503c2 .. \u503cNdo\u547d\u4ee4\u5e8f\u5217done\u5339\u914d\u6761\u4ef6\u65f6\u5faa\u73af\u6267\u884c\u52a8\u4f5c；\u76f4\u63a5\u7ed9\u53d8\u91cf\u8d4b\u503c\u65f6，\u8d4b\u503c\u7684\u6b21\u6570\u5c31\u662f\u5faa\u73af\u7684\u6b21\u6570；\u591a\u4e2a\u503c\u4e4b\u95f4\u7528\u7a7a\u683c\u5206\u9694；for ((\u53d8\u91cf;\u6761\u4ef6;\u8fd0\u7b97))do\u547d\u4ee4\u5e8f\u5217done\u5339\u914d\u6761\u4ef6\u65f6\u5faa\u73af\u6267\u884c\u52a8\u4f5c&#x\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/92213.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-09T11:00:51+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260809110050-6a785de246e35.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/92213.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/92213.html\",\"name\":\"\u3010RHCA+\u3011for\u5faa\u73af - 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