{"id":508,"date":"2021-07-23T16:21:32","date_gmt":"2021-07-23T08:21:32","guid":{"rendered":"http:\/\/149.28.72.201\/?p=508"},"modified":"2021-12-20T10:43:17","modified_gmt":"2021-12-20T02:43:17","slug":"bash-case","status":"publish","type":"post","link":"https:\/\/www.oceansource.cc\/?p=508","title":{"rendered":"22\u3001bash\u811a\u672c\u7f16\u7a0b\u4e4b\u4e94 case\u8bed\u53e5\u53ca\u811a\u672c\u9009\u9879\u8fdb\u9636"},"content":{"rendered":"\n

22.1 \u9009\u62e9\u7ed3\u6784\uff1a<\/p>\n\n\n\n

1\u3001if\u8bed\u53e5<\/p>\n\n\n\n

\u5355\u5206\u652f\u3001<\/p>\n\n\n\n

    if: <\/p>\n\n\n\n

    if CONDITION; then<\/p>\n\n\n\n

      statement<\/p>\n\n\n\n

      …<\/p>\n\n\n\n

    fi<\/p>\n\n\n\n

    \u53cc\u5206\u652f\u3001<\/p>\n\n\n\n

    if CONDITION; then<\/p>\n\n\n\n

      statement<\/p>\n\n\n\n

      …<\/p>\n\n\n\n

    else<\/p>\n\n\n\n

      statement<\/p>\n\n\n\n

      …<\/p>\n\n\n\n

    fi<\/p>\n\n\n\n

\u591a\u5206\u652f<\/p>\n\n\n\n

    if CONDITION1; then<\/p>\n\n\n\n

      statement<\/p>\n\n\n\n

      …<\/p>\n\n\n\n

    elif CONDITION2; then<\/p>\n\n\n\n

      statement<\/p>\n\n\n\n

      …<\/p>\n\n\n\n

    esle<\/p>\n\n\n\n

      statement<\/p>\n\n\n\n

      …<\/p>\n\n\n\n

    fi<\/p>\n\n\n\n

2\u3001case\u8bed\u53e5\uff1a\u9009\u62e9\u7ed3\u6784<\/p>\n\n\n\n

    case SWITCH in <\/p>\n\n\n\n

    value1)<\/p>\n\n\n\n

      statement<\/p>\n\n\n\n

      …<\/p>\n\n\n\n

      ;;<\/p>\n\n\n\n

    value2)<\/p>\n\n\n\n

      statement<\/p>\n\n\n\n

      ..<\/p>\n\n\n\n

      ;;<\/p>\n\n\n\n

    *)<\/p>\n\n\n\n

      statement<\/p>\n\n\n\n

      …<\/p>\n\n\n\n

      ;;<\/p>\n\n\n\n

    esac<\/p>\n\n\n\n

\u4f8b1<\/p>\n\n\n\n

    a-z<\/p>\n\n\n\n

    A-Z<\/p>\n\n\n\n

    0-9<\/p>\n\n\n\n

    [abc]<\/p>\n\n\n\n

    \u8f93\u51fa\u4e0d\u540c\u7684\u5bf9\u5e94\u7ed3\u679c<\/p>\n\n\n\n

    #!\/bin\/bash<\/p>\n\n\n\n

    #<\/p>\n\n\n\n

    case $1 in<\/p>\n\n\n\n

    [A-Z])<\/p>\n\n\n\n

            echo “upper”;;<\/p>\n\n\n\n

    [a-z])<\/p>\n\n\n\n

            echo “lower”;;<\/p>\n\n\n\n

    [0-9])<\/p>\n\n\n\n

            echo “number”;;<\/p>\n\n\n\n

    *)<\/p>\n\n\n\n

            echo “wrong input”;;<\/p>\n\n\n\n

    esac<\/p>\n\n\n\n

\u4f8b2<\/p>\n\n\n\n

    \u53ea\u8bc6\u522b\u53c2\u6570start,stop,restart,status\u5176\u4e2d\u4e4b\u4e00<\/p>\n\n\n\n

    #!\/bin\/bash<\/p>\n\n\n\n

    #<\/p>\n\n\n\n

    case $1 in<\/p>\n\n\n\n

    start)<\/p>\n\n\n\n

       echo start;;<\/p>\n\n\n\n

    stop)<\/p>\n\n\n\n

       echo stop;;<\/p>\n\n\n\n

    restart)<\/p>\n\n\n\n

       echo restart;;<\/p>\n\n\n\n

    status)<\/p>\n\n\n\n

       echo status;;<\/p>\n\n\n\n

    *)<\/p>\n\n\n\n

       echo “The usage is `basename $0` {start|stop|restart|status}”;;<\/p>\n\n\n\n

    esac<\/p>\n\n\n\n

\u4f8b3<\/p>\n\n\n\n

\u5199\u4e00\u4e2a\u811a\u672c\uff0c\u53ef\u4ee5\u63a5\u53d7\u9009\u9879\u53ca\u53c2\u6570\uff0c\u800c\u540e\u80fd\u83b7\u53d6\u6bcf\u4e00\u4e2a\u53c2\u6570\uff0c\u53ca\u9009\u9879\u7684\u53c2\u6570\uff0c\u5e76\u80fd\u6839\u636e\u9009\u9879\u505a\u51fa\u7279\u5b9a\u7684\u64cd\u4f5c\uff0c\u6bd4\u5982<\/p>\n\n\n\n

adminusers.sh –add tom.jerry –del tom,jerry -v|–verbose -h|–help<\/p>\n\n\n\n

    #!\/bin\/bash<\/p>\n\n\n\n

    #<\/p>\n\n\n\n

    #\u8c03\u8bd5\u4fe1\u606f<\/p>\n\n\n\n

    DEBUG=0<\/p>\n\n\n\n

    ADD=0<\/p>\n\n\n\n

    DEL=0<\/p>\n\n\n\n

    for I in `seq 0 $#`; do<\/p>\n\n\n\n

      if [ $# -gt 0 ]; then<\/p>\n\n\n\n

          case $1 in<\/p>\n\n\n\n

          -v|–verbose)<\/p>\n\n\n\n

            DEBUG=1<\/p>\n\n\n\n

            shift ;;<\/p>\n\n\n\n

          -h|–help)<\/p>\n\n\n\n

            echo “Usage: `basename $0` –add USER_LIST –del USER_LIST -v|–verbose -h|–help”<\/p>\n\n\n\n

            exit 0<\/p>\n\n\n\n

            ;;<\/p>\n\n\n\n

          –add)<\/p>\n\n\n\n

            ADD=1<\/p>\n\n\n\n

            ADDUSERS=$2<\/p>\n\n\n\n

            shift 2<\/p>\n\n\n\n

            ;;<\/p>\n\n\n\n

          –del)<\/p>\n\n\n\n

            DEL=1<\/p>\n\n\n\n

            DELUSERS=$2<\/p>\n\n\n\n

            shift 2<\/p>\n\n\n\n

            ;;<\/p>\n\n\n\n

          *)<\/p>\n\n\n\n

            echo “Usage: `basename $0` –add USER_LIST –del USER_LIST -v|–verbose -h|–help”<\/p>\n\n\n\n

            exit 7<\/p>\n\n\n\n

            ;;<\/p>\n\n\n\n

        esac<\/p>\n\n\n\n

      fi<\/p>\n\n\n\n

    done<\/p>\n\n\n\n

    if [ $ADD -eq 1 ]; then<\/p>\n\n\n\n

      for USER in `echo $ADDUSERS | sed ‘s@,@ @g’`; do<\/p>\n\n\n\n

        if id $USER &> \/dev\/null; then<\/p>\n\n\n\n

          [ $DEBUG -eq 1 ] && echo “$USER exists.”<\/p>\n\n\n\n

        else<\/p>\n\n\n\n

          useradd $USER<\/p>\n\n\n\n

          [ $DEBUG -eq 1 ] && echo “Add user $USER finished.”<\/p>\n\n\n\n

        fi<\/p>\n\n\n\n

      done<\/p>\n\n\n\n

    fi<\/p>\n\n\n\n

    if [ $DEL -eq 1 ]; then<\/p>\n\n\n\n

      for USER in `echo $DELUSERS | sed ‘s@,@ @g’`; do<\/p>\n\n\n\n

        if id $USER &> \/dev\/null; then<\/p>\n\n\n\n

          userdel -r $USER<\/p>\n\n\n\n

         [ $DEBUG -eq 1 ] && echo “Delete $USER finished.”<\/p>\n\n\n\n

        else<\/p>\n\n\n\n

         [ $DEBUG -eq 1 ] && echo “$USER not exist.”<\/p>\n\n\n\n

        fi<\/p>\n\n\n\n

      done<\/p>\n\n\n\n

    fi<\/p>\n\n\n\n

\u4f8b4<\/p>\n\n\n\n

\u7ec3\u4e60\uff1a\u5199\u4e00\u4e2a\u811a\u672cshowlogged.sh\uff0c\u5176\u7528\u6cd5\u683c\u5f0f\u4e3a\uff1a<\/p>\n\n\n\n

showlogged.sh -v -c -h|–help<\/p>\n\n\n\n

\u5176\u4e2d\uff0c-h\u9009\u9879\u53ea\u80fd\u5355\u72ec\u4f7f\u7528\uff0c\u7528\u4e8e\u663e\u793a\u5e2e\u52a9\u4fe1\u606f\uff1b-c\u9009\u9879\u65f6\uff0c\u663e\u793a\u5f53\u524d\u7cfb\u7edf\u4e0a\u767b\u5f55\u7684\u6240\u6709\u7528\u6237\u6570\uff1b\u5982\u679c\u540c\u65f6\u4f7f\u7528\u4e86-v\u9009\u9879\uff0c\u5219\u65e2\u663e\u793a\u540c\u65f6\u767b\u5f55\u7684\u7528\u6237\u6570\uff0c\u53c8\u663e\u793a\u767b\u5f55\u7684\u7528\u6237\u7684\u76f8\u5173\u4fe1\u606f\uff1b\u5982<\/p>\n\n\n\n

Logged users: 4. <\/p>\n\n\n\n

They are:<\/p>\n\n\n\n

root     tty2         Feb 18 02:41<\/p>\n\n\n\n

root     pts\/1        Mar  8 08:36 (172.16.100.177)<\/p>\n\n\n\n

root     pts\/5        Mar  8 07:56 (172.16.100.177)<\/p>\n\n\n\n

hadoop   pts\/6        Mar  8 09:16 (172.16.100.177)<\/p>\n\n\n\n

    #!\/bin\/bash<\/p>\n\n\n\n

    #<\/p>\n\n\n\n

    declare -i SHOWNUM=0<\/p>\n\n\n\n

    declare -i SHOWUSERS=0<\/p>\n\n\n\n

    for I in `seq 1 $#`; do<\/p>\n\n\n\n

      if [ $# -gt 0 ]; then<\/p>\n\n\n\n

        case $1 in<\/p>\n\n\n\n

        -h|–help)<\/p>\n\n\n\n

          echo “Usage: `basename $0` -h|–help -c|–count -v|–verbose”<\/p>\n\n\n\n

          exit 0 ;;<\/p>\n\n\n\n

        -v|–verbose)<\/p>\n\n\n\n

          let SHOWUSERS=1<\/p>\n\n\n\n

          shift ;;<\/p>\n\n\n\n

        -c|–count)<\/p>\n\n\n\n

          let SHOWNUM=1<\/p>\n\n\n\n

          shift ;;<\/p>\n\n\n\n

        *)<\/p>\n\n\n\n

          echo “Usage: `basename $0` -h|–help -c|–count -v|–verbose”<\/p>\n\n\n\n

          exit 8 ;;<\/p>\n\n\n\n

        esac<\/p>\n\n\n\n

      fi<\/p>\n\n\n\n

    done<\/p>\n\n\n\n

    if [ $SHOWNUM -eq 1 ]; then<\/p>\n\n\n\n

      echo “Logged users: `who | wc -l`.”<\/p>\n\n\n\n

      if [ $SHOWUSERS -eq 1 ]; then<\/p>\n\n\n\n

        echo “They are:”<\/p>\n\n\n\n

        who<\/p>\n\n\n\n

      fi<\/p>\n\n\n\n

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

22.1 \u9009\u62e9\u7ed3\u6784\uff1a 1\u3001if\u8bed\u53e5 \u5355\u5206\u652f\u3001     if: […]<\/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-508","post","type-post","status-publish","format-standard","hentry","category-linux"],"aioseo_notices":[],"views":249,"_links":{"self":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts\/508","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=508"}],"version-history":[{"count":1,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts\/508\/revisions"}],"predecessor-version":[{"id":509,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts\/508\/revisions\/509"}],"wp:attachment":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=508"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=508"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=508"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}