{"id":1215,"date":"2019-04-29T09:53:45","date_gmt":"2019-04-29T01:53:45","guid":{"rendered":"https:\/\/blog.jsjs.org\/?p=1215"},"modified":"2019-04-29T09:53:45","modified_gmt":"2019-04-29T01:53:45","slug":"linux-bash-shell%e7%89%b9%e6%ae%8a%e5%8f%98%e9%87%8f%ef%bc%9ashell-0-%e5%92%8c%e5%91%bd%e4%bb%a4%e8%a1%8c%e5%8f%82%e6%95%b0","status":"publish","type":"post","link":"https:\/\/blog.jsjs.org\/?p=1215","title":{"rendered":"linux bash Shell\u7279\u6b8a\u53d8\u91cf\uff1aShell $0, $#, $*, $@, $?, $$\u548c\u547d\u4ee4\u884c\u53c2\u6570"},"content":{"rendered":"

\u5728linux\u4e0b\u914d\u7f6eshell\u53c2\u6570\u8bf4\u660e<\/p>\n

\u524d\u9762\u5df2\u7ecf\u8bb2\u5230\uff0c\u53d8\u91cf\u540d\u53ea\u80fd\u5305\u542b\u6570\u5b57\u3001\u5b57\u6bcd\u548c\u4e0b\u5212\u7ebf\uff0c\u56e0\u4e3a\u67d0\u4e9b\u5305\u542b\u5176\u4ed6\u5b57\u7b26\u7684\u53d8\u91cf\u6709\u7279\u6b8a\u542b\u4e49\uff0c\u8fd9\u6837\u7684\u53d8\u91cf\u88ab\u79f0\u4e3a\u7279\u6b8a\u53d8\u91cf\u3002
\n\u4f8b\u5982\uff0c$ \u8868\u793a\u5f53\u524dShell\u8fdb\u7a0b\u7684ID\uff0c\u5373pid\uff0c\u770b\u4e0b\u9762\u7684\u4ee3\u7801\uff1a<\/p>\n

    \n
  1. $echo $$<\/li>\n<\/ol>\n

    \u8fd0\u884c\u7ed3\u679c<\/p>\n

    29949<\/pre>\n
    \u7279\u6b8a\u53d8\u91cf\u5217\u8868<\/p>\n
    \u53d8\u91cf
    \n\u542b\u4e49<\/p>\n
    $0
    \n\u5f53\u524d\u811a\u672c\u7684\u6587\u4ef6\u540d<\/p>\n
    $n
    \n\u4f20\u9012\u7ed9\u811a\u672c\u6216\u51fd\u6570\u7684\u53c2\u6570\u3002n \u662f\u4e00\u4e2a\u6570\u5b57\uff0c\u8868\u793a\u7b2c\u51e0\u4e2a\u53c2\u6570\u3002\u4f8b\u5982\uff0c\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f$1\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f$2\u3002<\/p>\n
    $#
    \n\u4f20\u9012\u7ed9\u811a\u672c\u6216\u51fd\u6570\u7684\u53c2\u6570\u4e2a\u6570\u3002<\/p>\n
    $*
    \n\u4f20\u9012\u7ed9\u811a\u672c\u6216\u51fd\u6570\u7684\u6240\u6709\u53c2\u6570\u3002<\/p>\n
    $@
    \n\u4f20\u9012\u7ed9\u811a\u672c\u6216\u51fd\u6570\u7684\u6240\u6709\u53c2\u6570\u3002\u88ab\u53cc\u5f15\u53f7(” “)\u5305\u542b\u65f6\uff0c\u4e0e $* \u7a0d\u6709\u4e0d\u540c\uff0c\u4e0b\u9762\u5c06\u4f1a\u8bb2\u5230\u3002<\/p>\n
    $?
    \n\u4e0a\u4e2a\u547d\u4ee4\u7684\u9000\u51fa\u72b6\u6001\uff0c\u6216\u51fd\u6570\u7684\u8fd4\u56de\u503c\u3002<\/p>\n
    $$
    \n\u5f53\u524dShell\u8fdb\u7a0bID\u3002\u5bf9\u4e8e Shell \u811a\u672c\uff0c\u5c31\u662f\u8fd9\u4e9b\u811a\u672c\u6240\u5728\u7684\u8fdb\u7a0bID\u3002<\/p>\n
    \u547d\u4ee4\u884c\u53c2\u6570<\/h4>\n
    \u8fd0\u884c\u811a\u672c\u65f6\u4f20\u9012\u7ed9\u811a\u672c\u7684\u53c2\u6570\u79f0\u4e3a\u547d\u4ee4\u884c\u53c2\u6570\u3002\u547d\u4ee4\u884c\u53c2\u6570\u7528 $n \u8868\u793a\uff0c\u4f8b\u5982\uff0c$1 \u8868\u793a\u7b2c\u4e00\u4e2a\u53c2\u6570\uff0c$2 \u8868\u793a\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c\u4f9d\u6b21\u7c7b\u63a8\u3002
    \n\u8bf7\u770b\u4e0b\u9762\u7684\u811a\u672c\uff1a<\/p>\n
      \n
    1. #!\/bin\/bash<\/li>\n
    2. <\/li>\n
    3. echo “File Name: $0”<\/li>\n
    4. echo “First Parameter : $1”<\/li>\n
    5. echo “First Parameter : $2”<\/li>\n
    6. echo “Quoted Values: $@”<\/li>\n
    7. echo “Quoted Values: $*”<\/li>\n
    8. echo “Total Number of Parameters : $#”<\/li>\n<\/ol>\n
      \u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n
      $.\/test.sh Zara Ali\nFile Name : .\/test.sh\nFirst Parameter : Zara\nSecond Parameter : Ali\nQuoted Values: Zara Ali\nQuoted Values: Zara Ali\nTotal Number of Parameters : 2<\/pre>\n
      $* \u548c $@ \u7684\u533a\u522b<\/h4>\n
      $* \u548c $@ \u90fd\u8868\u793a\u4f20\u9012\u7ed9\u51fd\u6570\u6216\u811a\u672c\u7684\u6240\u6709\u53c2\u6570\uff0c\u4e0d\u88ab\u53cc\u5f15\u53f7(” “)\u5305\u542b\u65f6\uff0c\u90fd\u4ee5”$1” “$2” \u2026 “$n” \u7684\u5f62\u5f0f\u8f93\u51fa\u6240\u6709\u53c2\u6570\u3002
      \n\u4f46\u662f\u5f53\u5b83\u4eec\u88ab\u53cc\u5f15\u53f7(” “)\u5305\u542b\u65f6\uff0c”$*” \u4f1a\u5c06\u6240\u6709\u7684\u53c2\u6570\u4f5c\u4e3a\u4e00\u4e2a\u6574\u4f53\uff0c\u4ee5”$1 $2 \u2026 $n”\u7684\u5f62\u5f0f\u8f93\u51fa\u6240\u6709\u53c2\u6570\uff1b”$@” \u4f1a\u5c06\u5404\u4e2a\u53c2\u6570\u5206\u5f00\uff0c\u4ee5”$1″ “$2” \u2026 “$n” \u7684\u5f62\u5f0f\u8f93\u51fa\u6240\u6709\u53c2\u6570\u3002
      \n\u4e0b\u9762\u7684\u4f8b\u5b50\u53ef\u4ee5\u6e05\u695a\u7684\u770b\u5230 $* \u548c $@ \u7684\u533a\u522b\uff1a<\/p>\n
        \n
      1. #!\/bin\/bash<\/li>\n
      2. echo “\\$*=” $*<\/li>\n
      3. echo “\\”\\$*\\”=” “$*”<\/li>\n
      4. <\/li>\n
      5. echo “\\$@=” $@<\/li>\n
      6. echo “\\”\\$@\\”=” “$@”<\/li>\n
      7. <\/li>\n
      8. echo “print each param from \\$*”<\/li>\n
      9. for var in $*<\/li>\n
      10. do<\/li>\n
      11. echo “$var”<\/li>\n
      12. done<\/li>\n
      13. <\/li>\n
      14. echo “print each param from \\$@”<\/li>\n
      15. for var in $@<\/li>\n
      16. do<\/li>\n
      17. echo “$var”<\/li>\n
      18. done<\/li>\n
      19. <\/li>\n
      20. echo “print each param from \\”\\$*\\””<\/li>\n
      21. for var in “$*”<\/li>\n
      22. do<\/li>\n
      23. echo “$var”<\/li>\n
      24. done<\/li>\n
      25. <\/li>\n
      26. echo “print each param from \\”\\$@\\””<\/li>\n
      27. for var in “$@”<\/li>\n
      28. do<\/li>\n
      29. echo “$var”<\/li>\n
      30. done<\/li>\n<\/ol>\n
        \u6267\u884c .\/test.sh “a” “b” “c” “d”\uff0c\u770b\u5230\u4e0b\u9762\u7684\u7ed3\u679c\uff1a<\/p>\n
        $*=  a b c d\n\"$*\"= a b c d\n$@=  a b c d\n\"$@\"= a b c d\nprint each param from $*\na\nb\nc\nd\nprint each param from $@\na\nb\nc\nd\nprint each param from \"$*\"\na b c d\nprint each param from \"$@\"\na\nb\nc\nd<\/pre>\n
        \u9000\u51fa\u72b6\u6001<\/h4>\n
        $? \u53ef\u4ee5\u83b7\u53d6\u4e0a\u4e00\u4e2a\u547d\u4ee4\u7684\u9000\u51fa\u72b6\u6001\u3002\u6240\u8c13\u9000\u51fa\u72b6\u6001\uff0c\u5c31\u662f\u4e0a\u4e00\u4e2a\u547d\u4ee4\u6267\u884c\u540e\u7684\u8fd4\u56de\u7ed3\u679c\u3002
        \n\u9000\u51fa\u72b6\u6001\u662f\u4e00\u4e2a\u6570\u5b57\uff0c\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u5927\u90e8\u5206\u547d\u4ee4\u6267\u884c\u6210\u529f\u4f1a\u8fd4\u56de 0\uff0c\u5931\u8d25\u8fd4\u56de 1\u3002
        \n\u4e0d\u8fc7\uff0c\u4e5f\u6709\u4e00\u4e9b\u547d\u4ee4\u8fd4\u56de\u5176\u4ed6\u503c\uff0c\u8868\u793a\u4e0d\u540c\u7c7b\u578b\u7684\u9519\u8bef\u3002
        \n\u4e0b\u9762\u4f8b\u5b50\u4e2d\uff0c\u547d\u4ee4\u6210\u529f\u6267\u884c\uff1a<\/p>\n
        $.\/test.sh Zara Ali\nFile Name : .\/test.sh\nFirst Parameter : Zara\nSecond Parameter : Ali\nQuoted Values: Zara Ali\nQuoted Values: Zara Ali\nTotal Number of Parameters : 2\n$echo $?\n0\n$<\/pre>\n
        $? \u4e5f\u53ef\u4ee5\u8868\u793a\u51fd\u6570\u7684\u8fd4\u56de\u503c\uff0c\u540e\u7eed\u5c06\u4f1a\u8bb2\u89e3<\/p>\n","protected":false},"excerpt":{"rendered":"
        \u5728linux\u4e0b\u914d\u7f6eshell\u53c2\u6570\u8bf4\u660e \u524d\u9762\u5df2\u7ecf\u8bb2\u5230\uff0c\u53d8\u91cf\u540d\u53ea\u80fd\u5305\u542b\u6570\u5b57\u3001\u5b57\u6bcd\u548c\u4e0b\u5212\u7ebf\uff0c\u56e0\u4e3a\u67d0\u4e9b\u5305\u542b\u5176\u4ed6\u5b57\u7b26\u7684\u53d8\u91cf\u6709\u7279\u6b8a\u542b\u4e49\uff0c\u8fd9\u6837\u7684\u53d8\u91cf\u88ab\u79f0\u4e3a\u7279\u6b8a\u53d8\u91cf\u3002 \u4f8b\u5982\uff0c$ \u8868\u793a\u5f53\u524dShell\u8fdb\u7a0b\u7684ID\uff0c\u5373pid\uff0c\u770b\u4e0b\u9762\u7684\u4ee3\u7801\uff1a $echo $$ \u8fd0\u884c\u7ed3\u679c 29949 \u7279\u6b8a\u53d8\u91cf\u5217\u8868 \u53d8\u91cf \u542b\u4e49 $0 \u5f53\u524d\u811a\u672c\u7684\u6587\u4ef6\u540d $n \u4f20\u9012\u7ed9\u811a\u672c\u6216\u51fd\u6570\u7684\u53c2\u6570\u3002n \u662f\u4e00\u4e2a\u6570\u5b57\uff0c\u8868\u793a\u7b2c\u51e0\u4e2a\u53c2\u6570\u3002\u4f8b\u5982\uff0c\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f$1\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f$2\u3002 $# \u4f20\u9012\u7ed9\u811a\u672c\u6216\u51fd\u6570\u7684\u53c2\u6570\u4e2a\u6570\u3002 $* \u4f20\u9012\u7ed9\u811a\u672c\u6216\u51fd\u6570\u7684\u6240\u6709\u53c2\u6570\u3002 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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