{"id":519,"date":"2021-07-23T16:26:10","date_gmt":"2021-07-23T08:26:10","guid":{"rendered":"http:\/\/149.28.72.201\/?p=519"},"modified":"2021-12-20T10:43:03","modified_gmt":"2021-12-20T02:43:03","slug":"shell-while-read","status":"publish","type":"post","link":"https:\/\/www.oceansource.cc\/?p=519","title":{"rendered":"26\u3001\u811a\u672c\u7f16\u7a0b\u4e4bwhile\u8bed\u53e5\uff0cread\uff0cecho\u547d\u4ee4"},"content":{"rendered":"\n

26.1 \u811a\u672c\u7f16\u7a0b\u7ed3\u6784\u7b80\u4ecb<\/p>\n\n\n\n

\u987a\u5e8f\u7ed3\u6784<\/p>\n\n\n\n

\u9009\u62e9\u7ed3\u6784<\/p>\n\n\n\n

if<\/p>\n\n\n\n

case<\/p>\n\n\n\n

\u5faa\u73af\u7ed3\u6784<\/p>\n\n\n\n

for<\/p>\n\n\n\n

while<\/p>\n\n\n\n

until<\/p>\n\n\n\n

26.2 while\u5faa\u73af<\/p>\n\n\n\n

while\u5faa\u73af\uff1a\u9002\u7528\u4e8e\u5faa\u73af\u6b21\u6570\u672a\u77e5\u6216\u5faa\u73af\u8fc7\u591a\u7684\u573a\u666f\uff0c\u8981\u6709\u9000\u51fa\u6761\u4ef6<\/p>\n\n\n\n

\u8bed\u6cd5\uff1a<\/p>\n\n\n\n

while CONDITION; do<\/p>\n\n\n\n

  statement<\/p>\n\n\n\n

  …<\/p>\n\n\n\n

done<\/p>\n\n\n\n

\u8ba1\u7b97100\u4ee5\u5185\u6240\u6709\u6b63\u6574\u6570\u7684\u548c<\/p>\n\n\n\n

#!\/bin\/bash<\/p>\n\n\n\n

#<\/p>\n\n\n\n

declare -i I=1<\/p>\n\n\n\n

declare -i SUM=0<\/p>\n\n\n\n

while [ $I -le 100 ];do<\/p>\n\n\n\n

        let SUM+=I<\/p>\n\n\n\n

        let I++<\/p>\n\n\n\n

done<\/p>\n\n\n\n

echo $SUM<\/p>\n\n\n\n

26.3 \u7528\u6237\u4ea4\u4e92\uff08read\uff09<\/p>\n\n\n\n

read \u8bfb\u53d6\u7528\u6237\u8f93\u5165\uff08\u53ef\u4e00\u6b21\u8bfb\u53d6\u591a\u4e2a\u8f93\u5165\u5206\u7ed9\u4e0d\u540c\u7684\u7528\u6237\uff09<\/p>\n\n\n\n

-p \u663e\u793a\u63d0\u793a<\/p>\n\n\n\n

-t \u6307\u5b9a\u8d85\u65f6\u65f6\u95f4<\/p>\n\n\n\n

[root@localhost ~]# read a b c<\/p>\n\n\n\n

how ae^H you<\/p>\n\n\n\n

[root@localhost ~]# echo $a<\/p>\n\n\n\n

how<\/p>\n\n\n\n

[root@localhost ~]# echo $b<\/p>\n\n\n\n

ae<\/p>\n\n\n\n

[root@localhost ~]# echo $c<\/p>\n\n\n\n

you<\/p>\n\n\n\n

[root@localhost ~]# read a b c<\/p>\n\n\n\n

how are<\/p>\n\n\n\n

[root@localhost ~]# echo $a<\/p>\n\n\n\n

how<\/p>\n\n\n\n

[root@localhost ~]# echo $c<\/p>\n\n\n\n

[root@localhost ~]# read a b c<\/p>\n\n\n\n

how lo^H are you<\/p>\n\n\n\n

[root@localhost ~]# read $a<\/p>\n\n\n\n

abcd<\/p>\n\n\n\n

[root@localhost ~]# read a b c<\/p>\n\n\n\n

how old are you<\/p>\n\n\n\n

[root@localhost ~]# echo $a<\/p>\n\n\n\n

how<\/p>\n\n\n\n

[root@localhost ~]# echo $c<\/p>\n\n\n\n

are you<\/p>\n\n\n\n

[root@localhost ~]# <\/p>\n\n\n\n

[root@localhost ~]# read -p “please enter your name:” -t 5 name<\/p>\n\n\n\n

please enter your name:[root@localhost ~]# read -p “please enter your name:” -t 5 name<\/p>\n\n\n\n

please enter your name:bob<\/p>\n\n\n\n

[root@localhost ~]# echo $name<\/p>\n\n\n\n

bob<\/p>\n\n\n\n

[root@localhost ~]# <\/p>\n\n\n\n

26.4 bash\u811a\u672c\u8c03\u8bd5<\/p>\n\n\n\n

bash<\/p>\n\n\n\n

-n scripts.sh \u68c0\u6d4b\u811a\u672c\u662f\u5426\u6709\u9519\u8bef<\/p>\n\n\n\n

-x scripts.sh \u5206\u6b65\u6267\u884c\u811a\u672c<\/p>\n\n\n\n

\u7ec3\u4e60\uff1a\u8f6c\u6362\u7528\u6237\u8f93\u5165\u7684\u5b57\u7b26\u4e3a\u5927\u5199\uff0c\u9664\u4e86quit:<\/p>\n\n\n\n

[root@Daniel-R480 ~]# .\/translate.sh <\/p>\n\n\n\n

Input something:ech<\/p>\n\n\n\n

ECH<\/p>\n\n\n\n

Input something:quit<\/p>\n\n\n\n

[root@Daniel-R480 ~]# <\/p>\n\n\n\n

#!\/bin\/bash<\/p>\n\n\n\n

#<\/p>\n\n\n\n

read -p “Input something: ” STRING<\/p>\n\n\n\n

while [ $STRING != ‘quit’ ]; do<\/p>\n\n\n\n

  echo $STRING | tr ‘a-z’ ‘A-Z’<\/p>\n\n\n\n

  read -p “Input something: ” STRING<\/p>\n\n\n\n

done<\/p>\n\n\n\n

\u7ec3\u4e60\uff1a\u6bcf\u96945\u79d2\u67e5\u770bhadoop\u7528\u6237\u662f\u5426\u767b\u5f55\uff0c\u5982\u679c\u767b\u5f55\uff0c\u663e\u793a\u5176\u767b\u5f55\u5e76\u9000\u51fa\uff1b\u5426\u5219\uff0c\u663e\u793a\u5f53\u524d\u65f6\u95f4\uff0c\u5e76\u8bf4\u660ehadoop\u5c1a\u672a\u767b\u5f55\uff1a<\/p>\n\n\n\n

#!\/bin\/bash<\/p>\n\n\n\n

#<\/p>\n\n\n\n

who | grep “hadoop” &> \/dev\/null<\/p>\n\n\n\n

RETVAL=$?<\/p>\n\n\n\n

while [ $RETVAL -ne 0 ]; do<\/p>\n\n\n\n

        echo “`date`,hadoop is not log.”<\/p>\n\n\n\n

        sleep 5<\/p>\n\n\n\n

        who | grep “hadoop” &> \/dev\/null<\/p>\n\n\n\n

        RETVAL=$?<\/p>\n\n\n\n

done<\/p>\n\n\n\n

echo “hadoop is logged in”<\/p>\n\n\n\n

\u5199\u4e00\u4e2a\u811a\u672c\uff1a<\/p>\n\n\n\n

1) \u663e\u793a\u4e00\u4e2a\u83dc\u5355\u7ed9\u7528\u6237\uff1a<\/p>\n\n\n\n

d|D) show disk usages.<\/p>\n\n\n\n

m|M) show memory usages.<\/p>\n\n\n\n

s|S) show swap usages.<\/p>\n\n\n\n

*) quit.<\/p>\n\n\n\n

2) \u5f53\u7528\u6237\u7ed9\u5b9a\u9009\u9879\u540e\u663e\u793a\u76f8\u5e94\u7684\u5185\u5bb9\uff1b<\/p>\n\n\n\n

[root@Daniel-R480 ~]# .\/showdisk.sh <\/p>\n\n\n\n

d|D) show disk usages.<\/p>\n\n\n\n

m|M)show memory usages.<\/p>\n\n\n\n

s|S)show swap usages.<\/p>\n\n\n\n

*)quit<\/p>\n\n\n\n

Your choice:s<\/p>\n\n\n\n

Swap usage:<\/p>\n\n\n\n

Swap:         30291           0       30291<\/p>\n\n\n\n

[root@Daniel-R480 ~]# .\/showdisk.sh <\/p>\n\n\n\n

d|D) show disk usages.<\/p>\n\n\n\n

m|M)show memory usages.<\/p>\n\n\n\n

s|S)show swap usages.<\/p>\n\n\n\n

*)quit<\/p>\n\n\n\n

Your choice:q<\/p>\n\n\n\n

Unknown..<\/p>\n\n\n\n

[root@Daniel-R480 ~]# echo $?<\/p>\n\n\n\n

9<\/p>\n\n\n\n

#!\/bin\/bash<\/p>\n\n\n\n

#<\/p>\n\n\n\n

cat << EOF<\/p>\n\n\n\n

d|D) show disk usages.<\/p>\n\n\n\n

m|M)show memory usages.<\/p>\n\n\n\n

s|S)show swap usages.<\/p>\n\n\n\n

*)quit<\/p>\n\n\n\n

EOF<\/p>\n\n\n\n

read -p “Your choice:” CHOICE<\/p>\n\n\n\n

case $CHOICE in<\/p>\n\n\n\n

d|D)<\/p>\n\n\n\n

        echo “Disk usage:”<\/p>\n\n\n\n

        df -Ph;;<\/p>\n\n\n\n

m|M)<\/p>\n\n\n\n

        echo “Memory usage:”<\/p>\n\n\n\n

        free -m | grep “Mem”;;<\/p>\n\n\n\n

s|S)<\/p>\n\n\n\n

        echo “Swap usage:”<\/p>\n\n\n\n

        free -m | grep “Swap”;;<\/p>\n\n\n\n

*)<\/p>\n\n\n\n

        echo “Unknown..”<\/p>\n\n\n\n

        exit 9;;<\/p>\n\n\n\n

esac<\/p>\n\n\n\n

\u6269\u5c55\uff1a<\/p>\n\n\n\n

\u5f53\u7528\u6237\u9009\u62e9\u5b8c\u6210\uff0c\u663e\u793a\u76f8\u5e94\u4fe1\u606f\u540e\uff0c\u4e0d\u9000\u51fa\uff1b\u800c\u8ba9\u7528\u6237\u518d\u4e00\u6b21\u9009\u62e9\uff0c\u518d\u6b21\u663e\u793a\u76f8\u5e94\u5185\u5bb9\uff1b\u9664\u4e86\u7528\u6237\u4f7f\u7528quit\uff1b<\/p>\n\n\n\n

#!\/bin\/bash<\/p>\n\n\n\n

#<\/p>\n\n\n\n

cat << EOF<\/p>\n\n\n\n

d|D) show disk usages.<\/p>\n\n\n\n

m|M)show memory usages.<\/p>\n\n\n\n

s|S)show swap usages.<\/p>\n\n\n\n

*)quit<\/p>\n\n\n\n

EOF<\/p>\n\n\n\n

read -p “Your choice:” CHOICE<\/p>\n\n\n\n

while [ $CHOICE != ‘quit’ ];do<\/p>\n\n\n\n

{<\/p>\n\n\n\n

case $CHOICE in<\/p>\n\n\n\n

d|D)<\/p>\n\n\n\n

        echo “Disk usage:”<\/p>\n\n\n\n

        df -Ph;;<\/p>\n\n\n\n

m|M)<\/p>\n\n\n\n

        echo “Memory usage:”<\/p>\n\n\n\n

        free -m | grep “Mem”;;<\/p>\n\n\n\n

s|S)<\/p>\n\n\n\n

        echo “Swap usage:”<\/p>\n\n\n\n

        free -m | grep “Swap”;;<\/p>\n\n\n\n

*)<\/p>\n\n\n\n

        echo “Unknown..”<\/p>\n\n\n\n

        exit 9;;<\/p>\n\n\n\n

esac<\/p>\n\n\n\n

read -p “Your choice:” CHOICE<\/p>\n\n\n\n

echo\u8f93\u51fa\u4e0d\u540c\u683c\u5f0f\u7684\u6587\u672c<\/p>\n\n\n\n

[root@Daniel-R480 ~]# echo -e “\\033[1mHello\\033[0m,world.”<\/p>\n\n\n\n

Hello,world.<\/p>\n\n\n\n

[root@Daniel-R480 ~]# echo -e “\\033[31mHello\\033[0m,world.”<\/p>\n\n\n\n

Hello,world.<\/p>\n\n\n\n

[root@Daniel-R480 ~]# echo -e “\\033[32mHello\\033[0m,world.”<\/p>\n\n\n\n

Hello,world.<\/p>\n\n\n\n

[root@Daniel-R480 ~]# echo -e “\\033[41mHello\\033[0m,world.”<\/p>\n\n\n\n

Hello,world.<\/p>\n\n\n\n

[root@Daniel-R480 ~]# echo -e “\\033[42mHello\\033[0m,world.”<\/p>\n\n\n\n

Hello,world.<\/p>\n\n\n\n

[root@Daniel-R480 ~]# echo -e “\\033[1,31,43mHello\\033[0m,world.”<\/p>\n\n\n\n

Hello,world.<\/p>\n\n\n\n

[root@Daniel-R480 ~]# echo -e “\\033[1;31;43mHello\\033[0m,world.”<\/p>\n\n\n\n

Hello,world.<\/p>\n\n\n\n

[root@Daniel-R480 ~]#<\/p>\n\n\n\n

\"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

26.1 \u811a\u672c\u7f16\u7a0b\u7ed3\u6784\u7b80\u4ecb \u987a\u5e8f\u7ed3\u6784 \u9009\u62e9\u7ed3\u6784 if case \u5faa\u73af\u7ed3\u6784 for while until 26 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-519","post","type-post","status-publish","format-standard","hentry","category-linux"],"aioseo_notices":[],"views":138,"_links":{"self":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts\/519","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=519"}],"version-history":[{"count":4,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts\/519\/revisions"}],"predecessor-version":[{"id":743,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts\/519\/revisions\/743"}],"wp:attachment":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=519"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=519"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=519"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}