{"id":15756,"date":"2022-10-12T21:56:02","date_gmt":"2022-10-12T16:26:02","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-shell-script-adding-memory-functionality\/"},"modified":"2022-10-12T21:56:02","modified_gmt":"2022-10-12T16:26:02","slug":"solved-shell-script-adding-memory-functionality","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-shell-script-adding-memory-functionality\/","title":{"rendered":"[Solved] Shell Script – Adding memory functionality"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

\n
\n
<\/div>\n
\n
\n

You should store the result in a variable like this:<\/p>\n

result=$((operand1+operand2))\n<\/code><\/pre>\n
Then your first if<\/code> statement can check if this variable has a value, and if it does, skip the read<\/code> and use it instead.<\/p>\n
if [[ $result == \"\" ]]; then\n    echo Enter operand1 value:\n    read operand1\nelse\n    operand1=$result\n    echo \"Operand 1 is: $result\"\n    echo \"\"\nfi\n...\n<\/code><\/pre>\n
Here is the working version of your code:<\/p>\n
#!\/bin\/bash\n\nwhile true\ndo\n     if [[ $# -eq 0 ]] ; then\n        if [[ $result == \"\" ]]; then # check if $result is empty\n            echo Enter operand1 value: \n            read operand1\n        else\n            operand1=$result # if not empty then assign its value to $operand1\n            echo \"Operand 1 is: $result\"\n            echo \"\"\n        fi\n \n         # Offer choices\n         echo 1. Addition\n         echo 2. Subtraction\n         echo 3. Multiplication\n         echo 4. Division\n         echo 5. Exit\n \n         echo Enter your choice:\n         read choice\n\n         if [[ $choice != 1 && $choice != 2 && $choice != 3 && $choice != 4 && $choice != 5 ]] ; then\n             echo Sorry $choice is not a valid operator - please try again \n             echo Enter your choice:\n             read choice\n         fi\n \n         echo Enter operand2 value:\n         read operand2\n \n         # get operands and start computing based on the user's choice\n         if [[ $choice -eq 1 ]] ; then\n             result=$((operand1+operand2)) # store result\n             echo ----------------------------------------\n             echo Addition of $operand1 and $operand2 is $((operand1+operand2))\n             echo ----------------------------------------\n             echo\n         elif [[ $choice -eq 2 ]] ; then\n             result=$((operand1-operand2)) # store result\n             echo ----------------------------------------\n             echo Subtraction of $operand1 and $operand2 is $((operand1-operand2))\n             echo ----------------------------------------\n             echo\n         elif [[ $choice -eq 3 ]] ; then\n             result=$((operand1*operand2)) # store result\n             echo ----------------------------------------\n             echo Multiplication of $operand1 and $operand2 is $((operand1*operand2))\n             echo ----------------------------------------\n             echo\n         elif [[ $choice -eq 4 && operand2 -eq 0 ]] ; then\n             echo Can not divide by 0 please try again \n             echo Please enter operand2\n             read operand2\n             echo ----------------------------------------\n             echo Division of $operand1 and $operand2 is $((operand1\/operand2))\n             echo ----------------------------------------\n             echo    \n             result=$((operand1\/operand2)) # store result\n          elif [[ $choice -eq 4 && operand2 -ne 0 ]] ; then\n             result=$((operand1\/operand2)) # store result\n             echo ----------------------------------------\n             echo Division of $operand1 and $operand2 is $((operand1\/operand2))\n             echo ----------------------------------------\n             echo    \n         elif [[ $choice -eq 5 ]] ; then\n             exit    \n         else\n             echo ----------------------------------------\n             echo Invalid choice.. Please try again\n             echo ----------------------------------------\n             echo\n         fi        \n   else\n             echo ----------------------------------------\n             echo You either passed too many parameters or too less\n             echo than the optimum requirement.\n             echo\n             echo This program accepts a maximum of 2 arguments or no\n             echo argument at all in order to run successfully.\n             echo ----------------------------------------\n   fi\ndone\n<\/code><\/pre>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            3<\/span> <\/p><\/div>\n<\/div>\n
[ad_2]<\/p>\n
solved Shell Script – Adding memory functionality <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] You should store the result in a variable like this: result=$((operand1+operand2)) Then your first if statement can check if this variable has a value, and if it does, skip the read and use it instead. if [[ $result == “” ]]; then echo Enter operand1 value: read operand1 else operand1=$result echo “Operand 1 is: … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[1042,1043,443],"class_list":["post-15756","post","type-post","status-publish","format-standard","hentry","category-solved","tag-bash","tag-shell","tag-unix"],"yoast_head":"\n[Solved] Shell Script - Adding memory functionality - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-shell-script-adding-memory-functionality\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Shell Script - Adding memory functionality - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You should store the result in a variable like this: result=$((operand1+operand2)) Then your first if statement can check if this variable has a value, and if it does, skip the read and use it instead. if [[ $result == "" ]]; then echo Enter operand1 value: read operand1 else operand1=$result echo "Operand 1 is: ... Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jassweb.com\/solved\/solved-shell-script-adding-memory-functionality\/\" \/>\n<meta property=\"og:site_name\" content=\"JassWeb\" \/>\n<meta property=\"article:published_time\" content=\"2022-10-12T16:26:02+00:00\" \/>\n<meta name=\"author\" content=\"Kirat\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kirat\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/solved-shell-script-adding-memory-functionality\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/solved-shell-script-adding-memory-functionality\\\/\"},\"author\":{\"name\":\"Kirat\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#\\\/schema\\\/person\\\/65c9c7b7958150c0dc8371fa35dd7c31\"},\"headline\":\"[Solved] Shell Script – Adding memory functionality\",\"datePublished\":\"2022-10-12T16:26:02+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/solved-shell-script-adding-memory-functionality\\\/\"},\"wordCount\":56,\"publisher\":{\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#organization\"},\"keywords\":[\"bash\",\"shell\",\"unix\"],\"articleSection\":[\"Solved\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/solved-shell-script-adding-memory-functionality\\\/\",\"url\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/solved-shell-script-adding-memory-functionality\\\/\",\"name\":\"[Solved] Shell Script - Adding memory functionality - JassWeb\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#website\"},\"datePublished\":\"2022-10-12T16:26:02+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/solved-shell-script-adding-memory-functionality\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/jassweb.com\\\/solved\\\/solved-shell-script-adding-memory-functionality\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/solved-shell-script-adding-memory-functionality\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"[Solved] Shell Script – Adding memory functionality\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#website\",\"url\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/\",\"name\":\"JassWeb\",\"description\":\"Build High-quality Websites\",\"publisher\":{\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#organization\",\"name\":\"Jass Web\",\"url\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/jassweb.com\\\/wp-content\\\/uploads\\\/2021\\\/02\\\/jass-website-logo-1.png\",\"contentUrl\":\"https:\\\/\\\/jassweb.com\\\/wp-content\\\/uploads\\\/2021\\\/02\\\/jass-website-logo-1.png\",\"width\":693,\"height\":132,\"caption\":\"Jass Web\"},\"image\":{\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#\\\/schema\\\/person\\\/65c9c7b7958150c0dc8371fa35dd7c31\",\"name\":\"Kirat\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/wp-content\\\/litespeed\\\/avatar\\\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1778218008\",\"url\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/wp-content\\\/litespeed\\\/avatar\\\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1778218008\",\"contentUrl\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/wp-content\\\/litespeed\\\/avatar\\\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1778218008\",\"caption\":\"Kirat\"},\"sameAs\":[\"http:\\\/\\\/jassweb.com\"],\"url\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/author\\\/jaspritsinghghumangmail-com\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"[Solved] Shell Script - Adding memory functionality - JassWeb","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/jassweb.com\/solved\/solved-shell-script-adding-memory-functionality\/","og_locale":"en_US","og_type":"article","og_title":"[Solved] Shell Script - Adding memory functionality - JassWeb","og_description":"[ad_1] You should store the result in a variable like this: result=$((operand1+operand2)) Then your first if statement can check if this variable has a value, and if it does, skip the read and use it instead. if [[ $result == \"\" ]]; then echo Enter operand1 value: read operand1 else operand1=$result echo \"Operand 1 is: ... Read more","og_url":"https:\/\/jassweb.com\/solved\/solved-shell-script-adding-memory-functionality\/","og_site_name":"JassWeb","article_published_time":"2022-10-12T16:26:02+00:00","author":"Kirat","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Kirat","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/jassweb.com\/solved\/solved-shell-script-adding-memory-functionality\/#article","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/solved-shell-script-adding-memory-functionality\/"},"author":{"name":"Kirat","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31"},"headline":"[Solved] Shell Script – Adding memory functionality","datePublished":"2022-10-12T16:26:02+00:00","mainEntityOfPage":{"@id":"https:\/\/jassweb.com\/solved\/solved-shell-script-adding-memory-functionality\/"},"wordCount":56,"publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"keywords":["bash","shell","unix"],"articleSection":["Solved"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/jassweb.com\/solved\/solved-shell-script-adding-memory-functionality\/","url":"https:\/\/jassweb.com\/solved\/solved-shell-script-adding-memory-functionality\/","name":"[Solved] Shell Script - Adding memory functionality - JassWeb","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/#website"},"datePublished":"2022-10-12T16:26:02+00:00","breadcrumb":{"@id":"https:\/\/jassweb.com\/solved\/solved-shell-script-adding-memory-functionality\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/jassweb.com\/solved\/solved-shell-script-adding-memory-functionality\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/jassweb.com\/solved\/solved-shell-script-adding-memory-functionality\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/jassweb.com\/solved\/"},{"@type":"ListItem","position":2,"name":"[Solved] Shell Script – Adding memory functionality"}]},{"@type":"WebSite","@id":"https:\/\/jassweb.com\/solved\/#website","url":"https:\/\/jassweb.com\/solved\/","name":"JassWeb","description":"Build High-quality Websites","publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/jassweb.com\/solved\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/jassweb.com\/solved\/#organization","name":"Jass Web","url":"https:\/\/jassweb.com\/solved\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/","url":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","contentUrl":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","width":693,"height":132,"caption":"Jass Web"},"image":{"@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31","name":"Kirat","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1778218008","url":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1778218008","contentUrl":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1778218008","caption":"Kirat"},"sameAs":["http:\/\/jassweb.com"],"url":"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/"}]}},"_links":{"self":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/15756","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/comments?post=15756"}],"version-history":[{"count":0,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/15756\/revisions"}],"wp:attachment":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/media?parent=15756"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/categories?post=15756"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/tags?post=15756"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}