{"id":1252,"date":"2020-04-18T16:08:47","date_gmt":"2020-04-18T08:08:47","guid":{"rendered":"http:\/\/blog.ywdevops.cn\/?p=1252"},"modified":"2026-01-09T18:05:24","modified_gmt":"2026-01-09T10:05:24","slug":"env","status":"publish","type":"post","link":"https:\/\/blog.ywdevops.cn\/index.php\/2020\/04\/18\/env\/","title":{"rendered":"shell\u53d8\u91cf"},"content":{"rendered":"\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>\u53d8\u91cf\u66ff\u6362\u548c\u8d4b\u503c<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53d8\u91cf\u8d4b\u503c\u6709\u4e24\u79cd\u683c\u5f0f\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>variable=value<\/li>\n\n\n\n<li>${ variable=value }<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u53d8\u91cf\u8d4b\u503c\uff0c\u8bf4\u660e\u5982\u4e0b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u7b49\u53f7\u4e24\u8fb9\u53ef\u4ee5\u4e0d\u80fd\u6709\u7a7a\u683c\uff0c\u8fd9\u4f1a\u5f71\u54cd\u8d4b\u503c\u64cd\u4f5c\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u503c\u4e2d\u5305\u542b\u7a7a\u683c\uff0c\u90a3\u4e48\u9700\u8981\u7528\u53cc\u5f15\u53f7\u5f15\u8d77\u6765\u3002<\/li>\n\n\n\n<li>\u53d8\u91cf\u540d\u53ef\u4ee5\u5305\u542b\u5927\u5c0f\u5199\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u4e0b\u5212\u7ebf\u7b49\uff0c\u4e0d\u80fd\u4ee5\u6570\u5b57\u5f00\u5934\u3002<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\uff1a\u8fdb\u884c\u53d8\u91cf\u7684\u8d4b\u503c\u548c\u66ff\u6362\uff0c\u6ce8\u610f<strong>${variable}<\/strong>\u4e2d\u4e0d\u80fd\u6709\u7a7a\u683c\uff0c\u5426\u5219\u62a5\u9519\uff0c\u6267\u884c\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"609\" height=\"230\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/3-3.png\" alt=\"\" class=\"wp-image-1253\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/3-3.png 609w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/3-3-300x113.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/3-3-600x227.png 600w\" sizes=\"auto, (max-width: 609px) 100vw, 609px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u503c\u4e2d\u5305\u542b\u7a7a\u683c\uff0c\u6b64\u65f6\u9700\u8981\u4f7f\u7528\u53cc\u5f15\u53f7\u5f15\u8d77\u6765\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"597\" height=\"223\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/4-3.png\" alt=\"\" class=\"wp-image-1254\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/4-3.png 597w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/4-3-300x112.png 300w\" sizes=\"auto, (max-width: 597px) 100vw, 597px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528<strong>unset<\/strong>\u53ef\u4ee5\u6e05\u9664\u53d8\u91cf\u7684\u503c\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"598\" height=\"207\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/5-3.png\" alt=\"\" class=\"wp-image-1255\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/5-3.png 598w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/5-3-300x104.png 300w\" sizes=\"auto, (max-width: 598px) 100vw, 598px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><strong>\u53d8\u91cf\u8d4b\u503c\u7684\u6a21\u5f0f\u53ca\u5176\u542b\u4e49\u5982\u4e0b<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">\u6a21\u5f0f<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u542b\u4e49<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">variable=value<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5c06value\u7684\u503c\u8d4b\u503c\u7ed9variable<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">variable+value<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5bf9\u5df2\u8d4b\u503c\u7684variable\uff0c\u91cd\u8bbe\u5176\u503c<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">variable?value\u6216variable:?value<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5bf9\u672a\u8d4b\u503c\u7684variable\uff0c\u663e\u793a\u9519\u8bef\u4fe1\u606f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">variable:=value<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5bf9\u672a\u8d4b\u503c\u7684variable\uff0c\u5c06value\u503c\u8d4b\u7ed9\u5b83<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"> variable:-value <\/td><td class=\"has-text-align-center\" data-align=\"center\"> \u5bf9\u672a\u8d4b\u503c\u7684variable\uff0c\u5c06value\u503c\u8d4b\u7ed9\u5b83 \uff0c\u4f46\u662fvalue\u7684\u503c\u4e0d\u5b58\u50a8\u5230variable\u5bf9\u5e94\u7684\u5730\u5740\u7a7a\u95f4<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\uff1a\u5c06\u53d8\u91cfvar\u8d4b\u503c\u4e3ahello \uff0c\u7136\u540e\u6267\u884c\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"598\" height=\"229\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/6-3.png\" alt=\"\" class=\"wp-image-1257\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/6-3.png 598w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/6-3-300x115.png 300w\" sizes=\"auto, (max-width: 598px) 100vw, 598px\" \/><\/figure>\n\n\n\n<p class=\"has-pale-cyan-blue-background-color has-background wp-block-paragraph\">\u4ece\u4e0a\u56fe\u4e2d\u53ef\u4ee5\u770b\u5230\uff0cvar\u5df2\u7ecf\u8d4b\u503c\uff0c\u56e0\u6b64\u540e\u6765\u7684:=\u4ee5\u53ca:-\u547d\u4ee4\u90fd\u4e0d\u4f1a\u5bf9\u5b83\u91cd\u65b0\u8d4b\u503c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u9762\u4f7f\u7528unset\u547d\u4ee4\u5c06var\u7684\u503c\u6e05\u9664\uff0c\u7136\u540e\u518d\u6b21\u4f7f\u7528:=\u4ee5\u53ca:-\u547d\u4ee4\uff0c\u5982\u56fe:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"274\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/7-1.png\" alt=\"\" class=\"wp-image-1258\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/7-1.png 600w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/7-1-300x137.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure>\n\n\n\n<p class=\"has-pale-cyan-blue-background-color has-background wp-block-paragraph\">\u4ece\u4e0a\u56fe\u4e2d\u53ef\u4ee5\u770b\u51fa\uff0c\u6e05\u9664var\u7684\u503c\u540e\uff0c\u4f7f\u7528:-\u53ef\u4ee5\u91cd\u65b0\u5bf9var\u8fdb\u884c\u8d4b\u503c\uff0c\u4f46\u662f\u5e76\u6ca1\u6709\u5c06\u503c\u5199\u5165\u5730\u5740\u7a7a\u95f4\uff0c\u56e0\u6b64echo $var\u7684\u503c\u4e3a\u7a7a\uff0c\u800c\u4f7f\u7528:=\u8d4b\u503c\u540e\uff0c\u518d\u6b21\u6267\u884c$var\u770b\u5230\u53ef\u4ee5\u6253\u5370\u503c\uff0c\u503c\u5df2\u7ecf\u5199\u5165\u5730\u5740\u7a7a\u95f4\uff0c\u6b64\u4e3a:=\u4e0e:-\u7684\u533a\u522b<\/p>\n\n\n\n<p class=\"has-pale-pink-background-color has-background wp-block-paragraph\">\u6ce8\u610f\uff1a\u5728\u4f7f\u7528:=\u4e0e:-\u7684\u65f6\u5019\uff0c\u9700\u8981\u7528\u82b1\u62ec\u53f7\u62ec\u8d77\u6765\uff0c\u5426\u5219shell\u5c06\u4f1a\u628avar:=world\u5f53\u4f5c\u53d8\u91cf\u540d\u5904\u7406<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c06\u53d8\u91cf\u8bbe\u7f6e\u4e3a\u53ea\u8bfb\u540e\uff0c\u5982\u679c\u518d\u6b21\u5bf9\u53d8\u91cf\u8fdb\u884c\u8d4b\u503c\uff0c\u5c06\u63d0\u793a\u9519\u8bef\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"593\" height=\"205\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/8-3.png\" alt=\"\" class=\"wp-image-1261\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/8-3.png 593w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/8-3-300x104.png 300w\" sizes=\"auto, (max-width: 593px) 100vw, 593px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u6267\u884c\u547d\u4ee4readonly\u53ef\u4ee5\u67e5\u770b\u7cfb\u7edf\u4e2d\u6240\u6709\u7684\u53ea\u8bfb\u53d8\u91cf\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"601\" height=\"302\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/9-5.png\" alt=\"\" class=\"wp-image-1262\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/9-5.png 601w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/9-5-300x151.png 300w\" sizes=\"auto, (max-width: 601px) 100vw, 601px\" \/><\/figure>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>\u73af\u5883\u53d8\u91cf\uff1a<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9a\u4e49\u73af\u5883\u53d8\u91cf\u4e0e\u58f0\u660e\u73af\u5883\u53d8\u91cf\uff0c\u6267\u884c\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">varr=\/usr\/local\/abc     #\u5b9a\u4e49\u73af\u5883\u53d8\u91cf<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">export varr                   #\u58f0\u660e\u73af\u5883\u53d8\u91cf<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">unset   varr                   #\u6e05\u9664\u73af\u5883\u53d8\u91cf<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6253\u5370PATH\u53d8\u91cf\u7684\u503c\uff0c\u6267\u884c\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"652\" height=\"202\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/10-3.png\" alt=\"\" class=\"wp-image-1263\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/10-3.png 652w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/10-3-300x93.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/10-3-600x186.png 600w\" sizes=\"auto, (max-width: 652px) 100vw, 652px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u8981\u5728PATH\u4e2d\u6dfb\u52a0\u65b0\u7684\u76ee\u5f55\uff0c\u53ef\u4ee5\u6267\u884c\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"838\" height=\"190\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/11-7.png\" alt=\"\" class=\"wp-image-1264\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/11-7.png 838w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/11-7-300x68.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/11-7-768x174.png 768w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/11-7-600x136.png 600w\" sizes=\"auto, (max-width: 838px) 100vw, 838px\" \/><\/figure>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>\u4f4d\u7f6e\u53c2\u6570\uff1a<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f4d\u7f6e\u53c2\u6570\u662f\u4e00\u79cd\u7279\u6b8a\u7684shell\u53d8\u91cf\uff0c\u7528\u4e8e\u50cfshell\u811a\u672c\u4f20\u9012\u53c2\u6570\uff0c\u5176\u4e2d$1\u8868\u793a\u7b2c\u4e00\u4e2a\u53c2\u6570\u3001$2\u8868\u793a\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c\u4ee5\u6b64\u7c7b\u63a8\uff0c$0\u8868\u793a\u811a\u672c\u540d\u79f0\uff0c\u4ece$10\u5f00\u59cb\u9700\u8981\u4f7f\u7528\u82b1\u62ec\u53f7\u62ec\u8d77\u6765\uff0c\u5982${10}\u3001${11}&#8230;&#8230;.., $*\u548c$@\u4e00\u6837\uff0c\u8868\u793a\u4ece$1\u5f00\u59cb\u7684\u5168\u90e8\u53c2\u6570<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\uff0c\u6709\u4e00\u4e2a\u811a\u672c\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"595\" height=\"289\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/12-6.png\" alt=\"\" class=\"wp-image-1265\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/12-6.png 595w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/12-6-300x146.png 300w\" sizes=\"auto, (max-width: 595px) 100vw, 595px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"601\" height=\"329\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/13-5.png\" alt=\"\" class=\"wp-image-1266\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/13-5.png 601w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/13-5-300x164.png 300w\" sizes=\"auto, (max-width: 601px) 100vw, 601px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><strong>shell\u7279\u6b8a\u4f4d\u7f6e\u53c2\u6570\u53ca\u5176\u542b\u4e49<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">\u7279\u6b8a\u4f4d\u7f6e\u53c2\u6570<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u542b\u4e49<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">$#<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u4f20\u9012\u5230\u811a\u672c\u7684\u53c2\u6570\u6570\u91cf<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">$@<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u4e0e$*\u533a\u522b\u5728\u4e8e\u662f\u5426\u88ab\u5b57\u7b26\u4e32\u5305\u88f9<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">$*<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u4e0e$@\u533a\u522b\u5728\u4e8e\u662f\u5426\u88ab\u5b57\u7b26\u4e32\u5305\u88f9<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">$0<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u811a\u672c\u540d<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">$$<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u811a\u672c\u8fd0\u884c\u7684\u8fdb\u7a0b\u53f7<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">$?<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u9000\u51fa\u72b6\u6001\uff0c0\u8868\u793a\u9000\u51fa\u6b63\u5e38\uff0c\u975e0\u8868\u793a\u9519\u8bef<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">$1-$9<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u7b2c1-9\u4e2a\u53c2\u6570<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">1\u3001\u6253\u5370\u4f20\u9012\u7ed9\u811a\u672c\u7684\u53c2\u6570\u6570\u91cf($#)\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"643\" height=\"111\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/14.png\" alt=\"\" class=\"wp-image-19474\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/14.png 643w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/14-300x52.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/14-600x104.png 600w\" sizes=\"auto, (max-width: 643px) 100vw, 643px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"644\" height=\"82\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/1-1.png\" alt=\"\" class=\"wp-image-19476\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/1-1.png 644w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/1-1-300x38.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/1-1-600x76.png 600w\" sizes=\"auto, (max-width: 644px) 100vw, 644px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">2\u3001\u811a\u672c\u4e2d\u7684$@\u6ca1\u6709\u88ab\u5b57\u7b26\u4e32\u5305\u88f9\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"641\" height=\"150\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/2-1.png\" alt=\"\" class=\"wp-image-19478\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/2-1.png 641w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/2-1-300x70.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/2-1-600x140.png 600w\" sizes=\"auto, (max-width: 641px) 100vw, 641px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"634\" height=\"163\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/4-1.png\" alt=\"\" class=\"wp-image-19482\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/4-1.png 634w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/4-1-300x77.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/4-1-600x154.png 600w\" sizes=\"auto, (max-width: 634px) 100vw, 634px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u811a\u672c\u4e2d\u7684$* \u6ca1\u6709\u88ab\u5b57\u7b26\u4e32\u5305\u88f9\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"642\" height=\"164\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/6-1.png\" alt=\"\" class=\"wp-image-19484\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/6-1.png 642w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/6-1-300x77.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/6-1-600x153.png 600w\" sizes=\"auto, (max-width: 642px) 100vw, 642px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"647\" height=\"174\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/7-1.png\" alt=\"\" class=\"wp-image-19485\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/7-1.png 647w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/7-1-300x81.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/7-1-600x161.png 600w\" sizes=\"auto, (max-width: 647px) 100vw, 647px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\uff1a\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c\u5f53$@\u548c$*\u90fd\u6ca1\u6709\u88ab\u5b57\u7b26\u4e32\u5305\u62ec\u7684\u65f6\u5019\uff0c\u7ed3\u679c\u6ca1\u533a\u522b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3\u3001\u811a\u672c\u4e2d\u7684$@\u88ab\u5b57\u7b26\u4e32\u5305\u88f9\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"643\" height=\"181\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/8-1.png\" alt=\"\" class=\"wp-image-19488\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/8-1.png 643w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/8-1-300x84.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/8-1-600x169.png 600w\" sizes=\"auto, (max-width: 643px) 100vw, 643px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ed3\u679c\u662f\u4fdd\u6301\u539f\u53c2\u6570\u6837\u5b50\uff0c\u6bcf\u4e2a\u53c2\u6570\u4f9d\u65e7\u662f\u72ec\u7acb\u5b57\u7b26\u4e32\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"643\" height=\"167\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/9-1.png\" alt=\"\" class=\"wp-image-19490\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/9-1.png 643w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/9-1-300x78.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/9-1-600x156.png 600w\" sizes=\"auto, (max-width: 643px) 100vw, 643px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u811a\u672c\u4e2d\u7684$* 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class=\"wp-image-19493\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/11-1.png 649w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/11-1-300x43.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2026\/01\/11-1-600x86.png 600w\" sizes=\"auto, (max-width: 649px) 100vw, 649px\" \/><\/figure>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>\u5f15\u7528\uff1a<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><strong>\u5f15\u7528\u7b26\u53f7\u540d\u79f0\u53ca\u5176\u610f\u4e49\u5982\u4e0b<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">\u7b26\u53f7<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u540d\u79f0<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u542b\u4e49<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">&#8221; &#8220;<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u53cc\u5f15\u53f7<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5f15\u7528\u9664\u7f8e\u5143\u7b26\u53f7$\u3001\u53cd\u5f15\u53f7&#8220;\u548c\u53cd\u659c\u7ebf\u4e4b\u5916\u7684\u6240\u6709\u5b57\u7b26<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">&#8216; &#8216;<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5355\u5f15\u53f7<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5f15\u7528\u6240\u6709\u5b57\u7b26<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">&#8220;<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u53cd\u5f15\u53f7<\/td><td class=\"has-text-align-center\" data-align=\"center\">shell\u5c06\u53cd\u5f15\u53f7\u4e2d\u7684\u5185\u5bb9\u89e3\u91ca\u4e3a\u7cfb\u7edf\u547d\u4ee4<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\\<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u53cd\u659c\u7ebf<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u8f6c\u4e49\u7b26\uff0c\u5c4f\u853d\u4e0b\u4e00\u5b57\u7b26\u7684\u7279\u6b8a\u542b\u4e49<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5168\u5f15\u7528\u548c\u90e8\u5206\u5f15\u7528<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53cc\u5f15\u53f7\u5f15\u7528\u9664\u7f8e\u5143\u7b26\u53f7$\u3001\u53cd\u5f15\u53f7<code>\u548c\u53cd\u659c\u7ebf\u4e4b\u5916\u7684\u6240\u6709\u5b57\u7b26\uff0c\u5373($)\u3001\uff08<\/code>&#8220;\uff09\u3001(\\)\u5728\u53cc\u5f15\u53f7\u4e2d\u4efb\u88ab\u89e3\u91ca\u6210\u7279\u6b8a\u542b\u4e49\uff0c\u53cc\u5f15\u53f7\u4e2d$\u7b26\u53f7\u53ef\u4ee5\u5f15\u7528\u53d8\u91cf\uff0c\u5229\u7528\u53cc\u5f15\u53f7\u53ef\u4ee5\u9632\u6b62\u5b57\u7b26\u4e32\u5206\u5272\uff0c\u4fdd\u7559\u53d8\u91cf\u7a7a\u683c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\uff0c\u73b0\u6709\u4ee5\u811a\u672c\u6587\u4ef6test.sh\uff0c\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"597\" height=\"205\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/16-5.png\" alt=\"\" class=\"wp-image-1270\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/16-5.png 597w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/16-5-300x103.png 300w\" sizes=\"auto, (max-width: 597px) 100vw, 597px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u811a\u672c\u6267\u884c\u540e\u7684\u8f93\u51fa\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"594\" height=\"190\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/17-4.png\" alt=\"\" class=\"wp-image-1271\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/17-4.png 594w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/17-4-300x96.png 300w\" sizes=\"auto, (max-width: 594px) 100vw, 594px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u7531\u4e0a\u56fe\u4e2d\u53ef\u4ee5\u770b\u5230\uff0c\u7b2c\u4e00\u4e2a\u53d8\u91cfvar\u7684\u503c\u901a\u8fc7&#8221;$var&#8221;\u6216\u8005$var\u6253\u5370\u51fa\u6765\u7684\u5185\u5bb9\u76f8\u540c\uff0c\u7b2c\u4e8c\u4e2a\u53d8\u91cf\u4e3a\u5b57\u7b26\u4e32\uff0c\u5176\u4e2dhello\u4e0eworld\u4e4b\u95f4\u5b58\u5728\u4e09\u4e2a\u7a7a\u683c\uff0c\u5728\u6253\u5370\u65f6\uff0c&#8221;$varr&#8221;\u4fdd\u7559\u4e86\u539f\u7a7a\u683c\u4fe1\u606f\uff0c\u800c$var\u5219\u53ea\u662f\u6709\u4e00\u4e2a\u7a7a\u683c\uff0c\u5bfc\u81f4\u5b57\u7b26\u4e32\u88ab\u5206\u5272\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5355\u5f15\u53f7\u4e2d\u7684\u5b57\u7b26\u9664\u4e86\u5355\u5f15\u53f7\u672c\u8eab\u5916\uff0c\u5176\u4f59\u90fd\u88ab\u89e3\u91ca\u6210\u666e\u901a\u5b57\u7b26\uff0c\u5355\u5f15\u53f7\u4e0d\u5728\u5177\u5907\u5f15\u7528\u53d8\u91cf\u7684\u529f\u80fd\uff0c\u56e0\u6b64\u5355\u5f15\u53f7\u4e3a\u5168\u5f15\u7528\uff0c\u53cc\u5f15\u53f7\u4e3a\u90e8\u5206\u5f15\u7528\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\uff1a\u73b0\u5b9a\u4e49\u53d8\u91cfvarr\u7684\u503c\u4e3ahello ,\u901a\u8fc7\u5355\u5f15\u53f7\u4ee5\u53ca\u53cc\u5f15\u53f7\u5206\u522b\u6253\u5370\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"596\" height=\"197\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/18-7.png\" alt=\"\" class=\"wp-image-1272\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/18-7.png 596w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/18-7-300x99.png 300w\" sizes=\"auto, (max-width: 596px) 100vw, 596px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u547d\u4ee4\u66ff\u6362<\/strong>\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u547d\u4ee4\u66ff\u6362\u662f\u6307\u5c06\u547d\u4ee4\u7684\u6807\u51c6\u8f93\u51fa\u4f5c\u4e3a\u503c\u8d4b\u503c\u67d0\u4e2a\u53d8\u91cf\uff0c\u6709\u4e24\u79cd\u65b9\u5f0f\u8fdb\u884c\u547d\u4ee4\u66ff\u6362\uff0c\u4e00\u79cd\u662f\u4f7f\u7528\u53cd\u5f15\u53f7\uff0c\u4e00\u79cd\u662f\u901a\u8fc7$()\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"207\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/19-6.png\" alt=\"\" class=\"wp-image-1273\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/19-6.png 600w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2020\/04\/19-6-300x104.png 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