{"id":181966,"date":"2025-01-12T18:27:08","date_gmt":"2025-01-12T18:27:08","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=181966"},"modified":"2025-01-12T18:27:13","modified_gmt":"2025-01-12T18:27:13","slug":"st-semester-2021-troduction-to-unix-all-sections-depending-on-the-following-snapshot-of-a-bash-terminal","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/01\/12\/st-semester-2021-troduction-to-unix-all-sections-depending-on-the-following-snapshot-of-a-bash-terminal\/","title":{"rendered":"st Semester 2021 TRODUCTION TO UNIX (All Sections ) Depending on the following Snapshot of a bash terminal"},"content":{"rendered":"\n<p>st Semester 2021 TRODUCTION TO UNIX (All Sections ) Depending on the following Snapshot of a bash terminal, What is the output of the last co ranas-mbp:- rana$ cat|wc &amp; (1) 1080 ranas-mbp:- ranas psf UID PID PPIDC STIMETTY TIME CMD 228 1072 1073 02:58PM Hys00:00.04 -bash 228 1079 1072 0 3:09PM Itys000 0:00.01 cat 228 1080 1072 0 3:09PM tys000 0.0001 WC ranas-mbpranas echo SS 1072 228 1073 1080 ere to search<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\">The correct answer and explanation is:<\/mark><\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Output of the Last Command:<\/h3>\n\n\n\n<p>The output of the last command <code>cat | wc &amp;<\/code> would not be visible directly to the terminal because the command is run in the background due to the <code>&amp;<\/code> symbol. However, we can analyze what happens when this command is executed:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><code>cat<\/code> without any arguments reads from standard input (stdin).<\/li>\n\n\n\n<li>The pipe (<code>|<\/code>) redirects the output of <code>cat<\/code> to <code>wc<\/code>.<\/li>\n\n\n\n<li><code>wc<\/code> is the &#8220;word count&#8221; utility, which reads input and counts lines, words, and characters.<\/li>\n<\/ol>\n\n\n\n<p>Since no input is provided to <code>cat<\/code>, it will wait for input indefinitely unless interrupted.<\/p>\n\n\n\n<p>When executed in the background using <code>&amp;<\/code>, the command does not display its output directly to the terminal but instead creates background processes for <code>cat<\/code> and <code>wc<\/code>.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Observations from the Process Table (<code>ps<\/code>):<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <code>ps<\/code> command shows processes and their details.<\/li>\n\n\n\n<li>PID <code>1079<\/code>: A background process for <code>cat<\/code> is running.<\/li>\n\n\n\n<li>PID <code>1080<\/code>: A background process for <code>wc<\/code> is also running.<\/li>\n\n\n\n<li>Both processes are waiting for input.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Command Breakdown<\/strong>:\n<ul class=\"wp-block-list\">\n<li><code>cat | wc &amp;<\/code>: Runs <code>cat<\/code> and <code>wc<\/code> in a pipeline but in the background.<\/li>\n\n\n\n<li>Both <code>cat<\/code> and <code>wc<\/code> wait for input because the <code>cat<\/code> command is not provided with input, and <code>wc<\/code> depends on <code>cat<\/code>.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Process States<\/strong>:\n<ul class=\"wp-block-list\">\n<li>The <code>ps<\/code> output shows that <code>cat<\/code> and <code>wc<\/code> are running on <code>tty000<\/code> with minimal CPU time. They are idle, waiting for input.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Why No Visible Output<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Because the command is executed in the background, its output (if any) is not immediately visible in the terminal.<\/li>\n\n\n\n<li>To see the output, you would need to bring the processes to the foreground or provide input explicitly (e.g., via file redirection).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Practical Outcome<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Without input, the commands will remain active until killed or input is provided.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Final Answer:<\/h3>\n\n\n\n<p>The output of the last command is not directly visible because it runs in the background, awaiting input. If terminated without input, there is no meaningful output.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>st Semester 2021 TRODUCTION TO UNIX (All Sections ) Depending on the following Snapshot of a bash terminal, What is the output of the last co ranas-mbp:- rana$ cat|wc &amp; (1) 1080 ranas-mbp:- ranas psf UID PID PPIDC STIMETTY TIME CMD 228 1072 1073 02:58PM Hys00:00.04 -bash 228 1079 1072 0 3:09PM Itys000 0:00.01 cat [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","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":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-181966","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/181966","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=181966"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/181966\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=181966"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=181966"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=181966"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}