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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><link href=https://flokoe.github.io/bash-hackers-wiki/snipplets/prargs/ rel=canonical><link href=../pause_command/ rel=prev><link href=../print_horizontal_line/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.5.44"><title>Print argument list for testing - The Bash Hackers Wiki</title><link rel=stylesheet href=../../assets/stylesheets/main.0253249f.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.06af60db.min.css><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback"><style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#print-argument-list-for-testing class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="The Bash Hackers Wiki" class="md-header__button md-logo" aria-label="The Bash Hackers Wiki" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> The Bash Hackers Wiki </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Print argument list for testing </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media data-md-color-scheme=slate data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palet
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</code></pre></div> <p>It uses the <a href=../../commands/builtin/printf/ >printf command</a> to generate a list of arguments, even with escape sequences interpreted. This list is shown formatted by the nl(1) utility.</p> <p>Another alternative with colorized output. If run in Bash, it temporarily disables all debug output for itself, including the test that determines whether to hide debug output. In ksh, tracing would have to be enabled on the function to show debug output, so it works out to being equivalent.</p> <div class=highlight><pre><span></span><code><a id=__codelineno-0-1 name=__codelineno-0-1 href=#__codelineno-0-1></a><span class=c1># Bash or ksh93 debugging function for colored display of argv.</span>
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<a id=__codelineno-0-2 name=__codelineno-0-2 href=#__codelineno-0-2></a><span class=c1># Optionally set OFD to the desired output file descriptor.</span>
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<a id=__codelineno-0-3 name=__codelineno-0-3 href=#__codelineno-0-3></a><span class=k>function</span><span class=w> </span>args<span class=w> </span><span class=o>{</span>
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<a id=__codelineno-0-4 name=__codelineno-0-4 href=#__codelineno-0-4></a><span class=w> </span><span class=o>{</span><span class=w> </span><span class=nv>BASH_XTRACEFD</span><span class=o>=</span><span class=m>3</span><span class=w> </span><span class=nb>command</span><span class=w> </span><span class=nb>eval</span><span class=w> </span><span class=si>${</span><span class=nv>BASH_VERSION</span><span class=p>+</span><span class=s2>"</span><span class=k>$(</span></dev/fd/0<span class=k>)</span><span class=s2>"</span><span class=si>}</span><span class=p>;</span><span class=w> </span><span class=o>}</span><span class=w> </span><span class=s><<-'EOF' 3>/dev/null</span>
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<a id=__codelineno-0-5 name=__codelineno-0-5 href=#__codelineno-0-5></a><span class=s> case $- in *x*)</span>
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<a id=__codelineno-0-6 name=__codelineno-0-6 href=#__codelineno-0-6></a><span class=s> set +x</span>
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<a id=__codelineno-0-7 name=__codelineno-0-7 href=#__codelineno-0-7></a><span class=s> trap 'trap RETURN; set -x' RETURN</span>
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<a id=__codelineno-0-8 name=__codelineno-0-8 href=#__codelineno-0-8></a><span class=s> esac</span>
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<a id=__codelineno-0-9 name=__codelineno-0-9 href=#__codelineno-0-9></a><span class=s>EOF</span>
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<a id=__codelineno-0-10 name=__codelineno-0-10 href=#__codelineno-0-10></a>
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<a id=__codelineno-0-11 name=__codelineno-0-11 href=#__codelineno-0-11></a><span class=w> </span><span class=o>[[</span><span class=w> </span><span class=si>${</span><span class=nv>OFD</span><span class=p>-1</span><span class=si>}</span><span class=w> </span><span class=o>==</span><span class=w> </span>+<span class=o>([</span><span class=m>0</span>-9<span class=o>])</span><span class=w> </span><span class=o>]]</span><span class=w> </span><span class=o>||</span><span class=w> </span><span class=k>return</span>
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<a id=__codelineno-0-12 name=__codelineno-0-12 href=#__codelineno-0-12></a>
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<a id=__codelineno-0-13 name=__codelineno-0-13 href=#__codelineno-0-13></a><span class=w> </span><span class=k>if</span><span class=w> </span><span class=o>[[</span><span class=w> </span>-t<span class=w> </span><span class=si>${</span><span class=nv>OFD</span><span class=k>:-</span><span class=nv>2</span><span class=si>}</span><span class=w> </span><span class=o>]]</span><span class=p>;</span><span class=w> </span><span class=k>then</span>
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<a id=__codelineno-0-14 name=__codelineno-0-14 href=#__codelineno-0-14></a><span class=w> </span><span class=nb>typeset</span><span class=w> </span>-A<span class=w> </span><span class=nv>clr</span><span class=o>=([</span>green<span class=o>]=</span><span class=k>$(</span>tput<span class=w> </span>setaf<span class=w> </span><span class=m>2</span><span class=k>)</span><span class=w> </span><span class=o>[</span>sgr0<span class=o>]=</span><span class=k>$(</span>tput<span class=w> </span>sgr0<span class=k>)</span><span class=o>)</span>
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<a id=__codelineno-0-15 name=__codelineno-0-15 href=#__codelineno-0-15></a><span class=w> </span><span class=k>else</span>
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<a id=__codelineno-0-16 name=__codelineno-0-16 href=#__codelineno-0-16></a><span class=w> </span><span class=nb>typeset</span><span class=w> </span>clr
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<a id=__codelineno-0-17 name=__codelineno-0-17 href=#__codelineno-0-17></a><span class=w> </span><span class=k>fi</span>
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<a id=__codelineno-0-18 name=__codelineno-0-18 href=#__codelineno-0-18></a>
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<a id=__codelineno-0-19 name=__codelineno-0-19 href=#__codelineno-0-19></a><span class=w> </span><span class=k>if</span><span class=w> </span>!<span class=w> </span><span class=si>${</span><span class=nv>1</span><span class=p>+false</span><span class=si>}</span><span class=p>;</span><span class=w> </span><span class=k>then</span>
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<a id=__codelineno-0-20 name=__codelineno-0-20 href=#__codelineno-0-20></a><span class=w> </span><span class=nb>printf</span><span class=w> </span>--<span class=w> </span><span class=s2>"</span><span class=si>${</span><span class=nv>clr</span><span class=p>[green]</span><span class=si>}</span><span class=s2><</span><span class=si>${</span><span class=nv>clr</span><span class=p>[sgr0]</span><span class=si>}</span><span class=s2>%s</span><span class=si>${</span><span class=nv>clr</span><span class=p>[green]</span><span class=si>}</span><span class=s2>></span><span class=si>${</span><span class=nv>clr</span><span class=p>[sgr0]</span><span class=si>}</span><span class=s2> "</span><span class=w> </span><span class=s2>"</span><span class=nv>$@</span><span class=s2>"</span>
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<a id=__codelineno-0-21 name=__codelineno-0-21 href=#__codelineno-0-21></a><span class=w> </span><span class=nb>echo</span>
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<a id=__codelineno-0-22 name=__codelineno-0-22 href=#__codelineno-0-22></a><span class=w> </span><span class=k>else</span>
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<a id=__codelineno-0-23 name=__codelineno-0-23 href=#__codelineno-0-23></a><span class=w> </span><span class=nb>echo</span><span class=w> </span><span class=s1>'no args.'</span>
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<a id=__codelineno-0-24 name=__codelineno-0-24 href=#__codelineno-0-24></a><span class=w> </span><span class=k>fi</span><span class=w> </span>><span class=p>&</span><span class=s2>"</span><span class=si>${</span><span class=nv>OFD</span><span class=k>:-</span><span class=nv>2</span><span class=si>}</span><span class=s2>"</span>
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<a id=__codelineno-0-25 name=__codelineno-0-25 href=#__codelineno-0-25></a><span class=o>}</span>
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