diff options
| author | johannst <johannst@users.noreply.github.com> | 2020-04-28 09:11:18 +0000 |
|---|---|---|
| committer | johannst <johannst@users.noreply.github.com> | 2020-04-28 09:11:18 +0000 |
| commit | 15230bbb9b1f69def9b0e1b41a097638c0fda734 (patch) | |
| tree | 2b490b2f0b8d6f3eab0af91c7ba5cc557b540af6 /misc/bash.html | |
| parent | ce1a0eaa58f7ad07c5389996a90c4b02bdf573fc (diff) | |
| download | notes-15230bbb9b1f69def9b0e1b41a097638c0fda734.tar.gz notes-15230bbb9b1f69def9b0e1b41a097638c0fda734.zip | |
deploy: fef4d6ff2ad9f48e6dccde0f061453e6a3ac624e
Diffstat (limited to 'misc/bash.html')
| -rw-r--r-- | misc/bash.html | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/misc/bash.html b/misc/bash.html new file mode 100644 index 0000000..6845b68 --- /dev/null +++ b/misc/bash.html @@ -0,0 +1,360 @@ +<!DOCTYPE HTML> +<html lang="en" class="sidebar-visible no-js light"> + <head> + <!-- Book generated using mdBook --> + <meta charset="UTF-8"> + <title>bash - Notes</title> + + + <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> + <meta name="description" content=""> + <meta name="viewport" content="width=device-width, initial-scale=1"> + <meta name="theme-color" content="#ffffff" /> + + <link rel="shortcut icon" href="../favicon.png"> + <link rel="stylesheet" href="../css/variables.css"> + <link rel="stylesheet" href="../css/general.css"> + <link rel="stylesheet" href="../css/chrome.css"> + <link rel="stylesheet" href="../css/print.css" media="print"> + + <!-- Fonts --> + <link rel="stylesheet" href="../FontAwesome/css/font-awesome.css"> + <link href="https://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800" rel="stylesheet" type="text/css"> + <link href="https://fonts.googleapis.com/css?family=Source+Code+Pro:500" rel="stylesheet" type="text/css"> + + <!-- Highlight.js Stylesheets --> + <link rel="stylesheet" href="../highlight.css"> + <link rel="stylesheet" href="../tomorrow-night.css"> + <link rel="stylesheet" href="../ayu-highlight.css"> + + <!-- Custom theme stylesheets --> + + + + </head> + <body> + <!-- Provide site root to javascript --> + <script type="text/javascript"> + var path_to_root = "../"; + var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "light" : "light"; + </script> + + <!-- Work around some values being stored in localStorage wrapped in quotes --> + <script type="text/javascript"> + try { + var theme = localStorage.getItem('mdbook-theme'); + var sidebar = localStorage.getItem('mdbook-sidebar'); + + if (theme.startsWith('"') && theme.endsWith('"')) { + localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1)); + } + + if (sidebar.startsWith('"') && sidebar.endsWith('"')) { + localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1)); + } + } catch (e) { } + </script> + + <!-- Set the theme before any content is loaded, prevents flash --> + <script type="text/javascript"> + var theme; + try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { } + if (theme === null || theme === undefined) { theme = default_theme; } + var html = document.querySelector('html'); + html.classList.remove('no-js') + html.classList.remove('light') + html.classList.add(theme); + html.classList.add('js'); + </script> + + <!-- Hide / unhide sidebar before it is displayed --> + <script type="text/javascript"> + var html = document.querySelector('html'); + var sidebar = 'hidden'; + if (document.body.clientWidth >= 1080) { + try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { } + sidebar = sidebar || 'visible'; + } + html.classList.remove('sidebar-visible'); + html.classList.add("sidebar-" + sidebar); + </script> + + <nav id="sidebar" class="sidebar" aria-label="Table of contents"> + <div id="sidebar-scrollbox" class="sidebar-scrollbox"> + <ol class="chapter"><li class="expanded "><a href="../misc/index.html"><strong aria-hidden="true">1.</strong> Misc</a></li><li><ol class="section"><li class="expanded "><a href="../misc/zsh.html"><strong aria-hidden="true">1.1.</strong> zsh</a></li><li class="expanded "><a href="../misc/bash.html" class="active"><strong aria-hidden="true">1.2.</strong> bash</a></li><li class="expanded "><a href="../misc/fish.html"><strong aria-hidden="true">1.3.</strong> fish</a></li><li class="expanded "><a href="../misc/tmux.html"><strong aria-hidden="true">1.4.</strong> tmux</a></li><li class="expanded "><a href="../misc/git.html"><strong aria-hidden="true">1.5.</strong> git</a></li><li class="expanded "><a href="../misc/awk.html"><strong aria-hidden="true">1.6.</strong> awk</a></li><li class="expanded "><a href="../misc/emacs.html"><strong aria-hidden="true">1.7.</strong> emacs</a></li><li class="expanded "><a href="../misc/gdb.html"><strong aria-hidden="true">1.8.</strong> gdb</a></li><li class="expanded "><a href="../misc/radare2.html"><strong aria-hidden="true">1.9.</strong> radare2</a></li></ol></li><li class="expanded "><a href="../monitor/index.html"><strong aria-hidden="true">2.</strong> Resource analysis & monitor</a></li><li><ol class="section"><li class="expanded "><a href="../monitor/lsof.html"><strong aria-hidden="true">2.1.</strong> lsof</a></li><li class="expanded "><a href="../monitor/pidstat.html"><strong aria-hidden="true">2.2.</strong> pidstat</a></li><li class="expanded "><a href="../monitor/pgrep.html"><strong aria-hidden="true">2.3.</strong> pgrep</a></li><li class="expanded "><a href="../monitor/pmap.html"><strong aria-hidden="true">2.4.</strong> pmap</a></li><li class="expanded "><a href="../monitor/pstack.html"><strong aria-hidden="true">2.5.</strong> pstack</a></li></ol></li><li class="expanded "><a href="../trace_profile/index.html"><strong aria-hidden="true">3.</strong> Trace and Profile</a></li><li><ol class="section"><li class="expanded "><a href="../trace_profile/strace.html"><strong aria-hidden="true">3.1.</strong> strace</a></li><li class="expanded "><a href="../trace_profile/ltrace.html"><strong aria-hidden="true">3.2.</strong> ltrace</a></li><li class="expanded "><a href="../trace_profile/perf.html"><strong aria-hidden="true">3.3.</strong> perf</a></li><li class="expanded "><a href="../trace_profile/oprofile.html"><strong aria-hidden="true">3.4.</strong> OProfile</a></li><li class="expanded "><a href="../trace_profile/time.html"><strong aria-hidden="true">3.5.</strong> time</a></li></ol></li><li class="expanded "><a href="../binary/index.html"><strong aria-hidden="true">4.</strong> Binary</a></li><li><ol class="section"><li class="expanded "><a href="../binary/od.html"><strong aria-hidden="true">4.1.</strong> od</a></li><li class="expanded "><a href="../binary/xxd.html"><strong aria-hidden="true">4.2.</strong> xxd</a></li><li class="expanded "><a href="../binary/readelf.html"><strong aria-hidden="true">4.3.</strong> readelf</a></li><li class="expanded "><a href="../binary/objdump.html"><strong aria-hidden="true">4.4.</strong> objdump</a></li><li class="expanded "><a href="../binary/nm.html"><strong aria-hidden="true">4.5.</strong> nm</a></li></ol></li><li class="expanded "><a href="../development/index.html"><strong aria-hidden="true">5.</strong> Development</a></li><li><ol class="section"><li class="expanded "><a href="../development/c++filt.html"><strong aria-hidden="true">5.1.</strong> c++filt</a></li><li class="expanded "><a href="../development/c++.html"><strong aria-hidden="true">5.2.</strong> c++</a></li><li class="expanded "><a href="../development/glibc.html"><strong aria-hidden="true">5.3.</strong> glibc</a></li><li class="expanded "><a href="../development/gcc.html"><strong aria-hidden="true">5.4.</strong> gcc</a></li><li class="expanded "><a href="../development/ld.so.html"><strong aria-hidden="true">5.5.</strong> ld.so</a></li></ol></li></ol> + </div> + <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div> + </nav> + + <div id="page-wrapper" class="page-wrapper"> + + <div class="page"> + + <div id="menu-bar" class="menu-bar"> + <div id="menu-bar-sticky-container"> + <div class="left-buttons"> + <button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar"> + <i class="fa fa-bars"></i> + </button> + <button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list"> + <i class="fa fa-paint-brush"></i> + </button> + <ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu"> + <li role="none"><button role="menuitem" class="theme" id="light">Light (default)</button></li> + <li role="none"><button role="menuitem" class="theme" id="rust">Rust</button></li> + <li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li> + <li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li> + <li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li> + </ul> + + <button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar"> + <i class="fa fa-search"></i> + </button> + + </div> + + <h1 class="menu-title">Notes</h1> + + <div class="right-buttons"> + <a href="../print.html" title="Print this book" aria-label="Print this book"> + <i id="print-button" class="fa fa-print"></i> + </a> + + </div> + </div> + </div> + + + <div id="search-wrapper" class="hidden"> + <form id="searchbar-outer" class="searchbar-outer"> + <input type="search" name="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header"> + </form> + <div id="searchresults-outer" class="searchresults-outer hidden"> + <div id="searchresults-header" class="searchresults-header"></div> + <ul id="searchresults"> + </ul> + </div> + </div> + + + <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM --> + <script type="text/javascript"> + document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible'); + document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible'); + Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) { + link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1); + }); + </script> + + <div id="content" class="content"> + <main> + <h1><a class="header" href="#bash1" id="bash1">bash(1)</a></h1> +<h2><a class="header" href="#expansion" id="expansion">Expansion</a></h2> +<h3><a class="header" href="#generator" id="generator">Generator</a></h3> +<pre><code class="language-bash"># generate sequence from n to m +{n..m} +# generate sequence from n to m step by s +{n..m..s} + +# expand cartesian product +{a,b}{c,d} +</code></pre> +<h3><a class="header" href="#parameter" id="parameter">Parameter</a></h3> +<pre><code class="language-bash"># default param +bar=${foo:-some_val} # if $foo set, then bar=$foo else bar=some_val + +# check param set +bar=${foo:?msg} # if $foo set, then bar=$foo else exit and print msg + +# indirect +FOO=foo +BAR=FOO +bar=${!BAR} # deref value of BAR -> bar=$FOO + +# prefix +${foo#prefix} # remove prefix when expanding $foo +# suffix +${foo%suffix} # remove suffix when expanding $foo + +# substitute +${foo/pattern/string} # replace pattern with string when expanding foo +# pattern starts with +# '/' replace all occurences of pattern +# '#' pattern match at beginning +# '%' pattern match at end +</code></pre> +<blockquote> +<p>Note: <code>prefix</code>/<code>suffix</code>/<code>pattern</code> are expanded as <a href="#pathname">pathnames</a>.</p> +</blockquote> +<h3><a class="header" href="#pathname" id="pathname">Pathname</a></h3> +<pre><code class="language-bash">* match any string +? match any single char +\\ match backslash +[abc] match any char of 'a' 'b' 'c' +[a-z] match any char between 'a' - 'z' +[^ab] negate, match all not 'a' 'b' +[:class:] match any char in class, available: + alnum,alpha,ascii,blank,cntrl,digit,graph,lower, + print,punct,space,upper,word,xdigit +</code></pre> +<p>Wit <code>extglob</code> shell option enabled it is possible to have more powerful +patterns. In the following <code>pattern-list</code> is one ore more patterns separated +by <code>|</code> char.</p> +<pre><code class="language-bash">?(pattern-list) matches zero or one occurrence of the given patterns +*(pattern-list) matches zero or more occurrences of the given patterns ++(pattern-list) matches one or more occurrences of the given patterns +@(pattern-list) matches one of the given patterns +!(pattern-list) matches anything except one of the given patterns +</code></pre> +<blockquote> +<p>Note: <code>shopt -s extglob</code>/<code>shopt -u extglob</code> to enable/disable <code>extglob</code> +option.</p> +</blockquote> +<h2><a class="header" href="#io-redirection" id="io-redirection">I/O redirection</a></h2> +<blockquote> +<p>Note: The trick with bash I/O redirection is to interpret from left-to-right.</p> +</blockquote> +<pre><code class="language-bash"># stdout & stderr to file +command >file 2>&1 +# equivalent +command &>file + +# stderr to stdout & stdout to file +command 2>&1 >file +</code></pre> +<h3><a class="header" href="#explanation" id="explanation">Explanation</a></h3> +<pre><code class="language-bash">j>&i +</code></pre> +<p>Duplicate <code>fd i</code> to <code>fd j</code>, making <code>j</code> a copy of <code>i</code>. See <a href="http://man7.org/linux/man-pages/man2/dup.2.html">dup2(2)</a>.</p> +<p>Example:</p> +<pre><code class="language-bash">command 2>&1 >file +</code></pre> +<ol> +<li>duplicate <code>fd 1</code> to <code>fd 2</code>, effectively redirecting <code>stderr</code> to <code>stdout</code></li> +<li>redirect <code>stdout</code> to <code>file</code></li> +</ol> +<h2><a class="header" href="#completion" id="completion">Completion</a></h2> +<p>The <code>complete</code> builtin is used to interact with the completion system.</p> +<pre><code class="language-bash">complete # print currently installed completion handler +complete -F <func> <cmd> # install <func> as completion handler for <cmd> +complete -r <cmd> # uninstall completion handler for <cmd> +</code></pre> +<p>Variables available in completion functions:</p> +<pre><code class="language-bash"># in +$1 # <cmd> +$2 # current word +$3 # privous word + +COMP_WORDS # array with current command line words +COMP_CWORD # index into COMP_WORDS with current cursor position + +# out +COMPREPLY # array with possible completions +</code></pre> +<p>The <code>compgen</code> builtin is used to generate possible matches by comparing <code>word</code> +against words generated by <code>option</code>.</p> +<pre><code class="language-bash">compgen [option] [word] + +# usefule options: +# -W <list> specify list of possible completions +# -d generate list with dirs +# -f generate list with files +# -u generate list with users +# -e generate list with exported variables + +# compare "f" against words "foo" "foobar" "bar" and generate matches +compgen -W "foo foobar bar" "f" + +# compare "hom" against file/dir names and generate matches +compgen -d -f "hom" +</code></pre> +<h3><a class="header" href="#example" id="example">Example</a></h3> +<p>Skeleton to copy/paste for writing simple completions.</p> +<p>Assume a program <code>foo</code> with the following interface:</p> +<pre><code class="language-bash">foo -c green|red|blue -s low|high -f <file> -h +</code></pre> +<p>The completion handler could be implemented as follows:</p> +<pre><code class="language-bash">function _foo() { + local curr=$2 + local prev=$3 + + local opts="-c -s -f -h" + case $prev in + -c) COMPREPLY=( $(compgen -W "green red blue" -- $curr) );; + -s) COMPREPLY=( $(compgen -W "low high" -- $curr) );; + -f) COMPREPLY=( $(compgen -f -- $curr) );; + *) COMPREPLY=( $(compgen -W "$opts" -- $curr) );; + esac +} + +complete -F _foo foo +</code></pre> + + </main> + + <nav class="nav-wrapper" aria-label="Page navigation"> + <!-- Mobile navigation buttons --> + + <a rel="prev" href="../misc/zsh.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> + <i class="fa fa-angle-left"></i> + </a> + + + + <a rel="next" href="../misc/fish.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> + <i class="fa fa-angle-right"></i> + </a> + + + <div style="clear: both"></div> + </nav> + </div> + </div> + + <nav class="nav-wide-wrapper" aria-label="Page navigation"> + + <a href="../misc/zsh.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> + <i class="fa fa-angle-left"></i> + </a> + + + + <a href="../misc/fish.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> + <i class="fa fa-angle-right"></i> + </a> + + </nav> + + </div> + + + + + + + + + <script type="text/javascript"> + window.playpen_copyable = true; + </script> + + + + + + <script src="../elasticlunr.min.js" type="text/javascript" charset="utf-8"></script> + <script src="../mark.min.js" type="text/javascript" charset="utf-8"></script> + <script src="../searcher.js" type="text/javascript" charset="utf-8"></script> + + + <script src="../clipboard.min.js" type="text/javascript" charset="utf-8"></script> + <script src="../highlight.js" type="text/javascript" charset="utf-8"></script> + <script src="../book.js" type="text/javascript" charset="utf-8"></script> + + <!-- Custom JS scripts --> + + + + + </body> +</html> |