diff options
Diffstat (limited to 'gemfeed/2022-01-01-bash-golf-part-2.html')
| -rw-r--r-- | gemfeed/2022-01-01-bash-golf-part-2.html | 59 |
1 files changed, 39 insertions, 20 deletions
diff --git a/gemfeed/2022-01-01-bash-golf-part-2.html b/gemfeed/2022-01-01-bash-golf-part-2.html index 4106611c..b8d4f5b7 100644 --- a/gemfeed/2022-01-01-bash-golf-part-2.html +++ b/gemfeed/2022-01-01-bash-golf-part-2.html @@ -8,10 +8,19 @@ <link rel="stylesheet" href="style-override.css" /> </head> <body> -<h1 style='display: inline'>Bash Golf Part 2</h1><br /> +<p class="header"> +<a href="https://foo.zone">Home</a> | <a href="https://codeberg.org/snonux/foo.zone/src/branch/content-md/gemfeed/2022-01-01-bash-golf-part-2.md">Markdown</a> | <a href="gemini://foo.zone/gemfeed/2022-01-01-bash-golf-part-2.gmi">Gemini</a> +</p> +<h1 style='display: inline' id='bash-golf-part-2'>Bash Golf Part 2</h1><br /> <br /> <span class='quote'>Published at 2022-01-01T23:36:15+00:00; Updated at 2022-01-05</span><br /> <br /> +<span>This is the second blog post about my Bash Golf series. This series is random Bash tips, tricks and weirdnesses I came across. It's a collection of smaller articles I wrote in an older (in German language) blog, which I translated and refreshed with some new content.</span><br /> +<br /> +<a class='textlink' href='./2021-11-29-bash-golf-part-1.html'>2021-11-29 Bash Golf Part 1</a><br /> +<a class='textlink' href='./2022-01-01-bash-golf-part-2.html'>2022-01-01 Bash Golf Part 2 (You are currently reading this)</a><br /> +<a class='textlink' href='./2023-12-10-bash-golf-part-3.html'>2023-12-10 Bash Golf Part 3</a><br /> +<br /> <pre> '\ '\ . . |>18>> \ \ . ' . | @@ -23,12 +32,19 @@ jgs^^^^^^^`^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Art by Joan Stark, mod. by Paul Buetow </pre> <br /> -<span>This is the second blog post about my Bash Golf series. This series is random Bash tips, tricks and weirdnesses I came across. It's a collection of smaller articles I wrote in an older (in German language) blog, which I translated and refreshed with some new content.</span><br /> -<br /> -<a class='textlink' href='./2021-11-29-bash-golf-part-1.html'>2021-11-29 Bash Golf Part 1</a><br /> -<a class='textlink' href='./2022-01-01-bash-golf-part-2.html'>2022-01-01 Bash Golf Part 2 (You are currently reading this)</a><br /> +<h2 style='display: inline' id='table-of-contents'>Table of Contents</h2><br /> <br /> -<h2 style='display: inline'>Redirection</h2><br /> +<ul> +<li><a href='#bash-golf-part-2'>Bash Golf Part 2</a></li> +<li>⇢ <a href='#redirection'>Redirection</a></li> +<li>⇢ <a href='#here'>HERE</a></li> +<li>⇢ <a href='#random'>RANDOM</a></li> +<li>⇢ <a href='#set--x-and-set--e-and-pipefile'>set -x and set -e and pipefile</a></li> +<li>⇢ ⇢ <a href='#-x'>-x</a></li> +<li>⇢ ⇢ <a href='#-e'>-e</a></li> +<li>⇢ ⇢ <a href='#pipefail'>pipefail</a></li> +</ul><br /> +<h2 style='display: inline' id='redirection'>Redirection</h2><br /> <br /> <span>Let's have a closer look at Bash redirection. As you might already know that there are 3 standard file descriptors:</span><br /> <br /> @@ -57,6 +73,8 @@ Foo Foo </pre> <br /> +<span class='quote'>Update: A reader pointed out, that the redirection should actually go to <span class='inlinecode'>/proc/self/fd/1</span> and not <span class='inlinecode'>0</span>. But apparently, either way works for this particular example. Do you know why? </span><br /> +<br /> <span>Other useful redirections are:</span><br /> <br /> <ul> @@ -158,7 +176,7 @@ First line: Learn You a Haskell Second line: for Great Good </pre> <br /> -<h2 style='display: inline'>HERE</h2><br /> +<h2 style='display: inline' id='here'>HERE</h2><br /> <br /> <span>I have mentioned HERE-documents and HERE-strings already in this post. Let's do some more examples. The following "cat" receives a multi line string from stdin. In this case, the input multi line string is a HERE-document. As you can see, it also interpolates variables (in this case the output of "date" running in a subshell).</span><br /> <br /> @@ -241,7 +259,7 @@ Learn you a Golang for Great Good I like Perl too </pre> <br /> -<h2 style='display: inline'>RANDOM</h2><br /> +<h2 style='display: inline' id='random'>RANDOM</h2><br /> <br /> <span>Random is a special built-in variable containing a different pseudo random number each time it's used.</span><br /> <br /> @@ -286,11 +304,11 @@ Delaying script execution for 42 seconds... Continuing script execution... </pre> <br /> -<h2 style='display: inline'>set -x and set -e and pipefile</h2><br /> +<h2 style='display: inline' id='set--x-and-set--e-and-pipefile'>set -x and set -e and pipefile</h2><br /> <br /> <span>In my opinion, -x and -e and pipefile are the most useful Bash options. Let's have a look at them one after another.</span><br /> <br /> -<h3 style='display: inline'>-x</h3><br /> +<h3 style='display: inline' id='-x'>-x</h3><br /> <br /> <span>-x prints commands and their arguments as they are executed. This helps to develop and debug your Bash code:</span><br /> <br /> @@ -332,7 +350,7 @@ Second line: for Great Good ❯ </pre> <br /> -<h3 style='display: inline'>-e</h3><br /> +<h3 style='display: inline' id='-e'>-e</h3><br /> <br /> <span>This is a very important option you want to use when you are paranoid. This means, you should always "set -e" in your scripts when you need to make absolutely sure that your script runs successfully (with that I mean that no command should exit with an unexpected status code).</span><br /> <br /> @@ -451,7 +469,7 @@ Hello You! <br /> <a class='textlink' href='./2021-05-16-personal-bash-coding-style-guide.html'>./2021-05-16-personal-bash-coding-style-guide.html</a><br /> <br /> -<h3 style='display: inline'>pipefail</h3><br /> +<h3 style='display: inline' id='pipefail'>pipefail</h3><br /> <br /> <span>The pipefail option makes it so that not only the exit code of the last command of the pipe counts regards its exit code but any command of the pipe:</span><br /> <br /> @@ -491,20 +509,21 @@ PAUL:X:1000:1000:PAUL BUETOW:/HOME/PAUL:/BIN/BASH 1 </pre> <br /> +<span>E-Mail your comments to <span class='inlinecode'>paul@nospam.buetow.org</span> :-)</span><br /> +<br /> <span>Other related posts are:</span><br /> <br /> -<a class='textlink' href='./2021-05-16-personal-bash-coding-style-guide.html'>2021-05-16 Personal Bash coding style guide</a><br /> -<a class='textlink' href='./2021-06-05-gemtexter-one-bash-script-to-rule-it-all.html'>2021-06-05 Gemtexter - One Bash script to rule it all</a><br /> -<a class='textlink' href='./2021-11-29-bash-golf-part-1.html'>2021-11-29 Bash Golf Part 1</a><br /> +<a class='textlink' href='./2023-12-10-bash-golf-part-3.html'>2023-12-10 Bash Golf Part 3</a><br /> <a class='textlink' href='./2022-01-01-bash-golf-part-2.html'>2022-01-01 Bash Golf Part 2 (You are currently reading this)</a><br /> -<br /> -<span>E-Mail your comments to <span class='inlinecode'>paul@nospam.buetow.org</span> :-)</span><br /> +<a class='textlink' href='./2021-11-29-bash-golf-part-1.html'>2021-11-29 Bash Golf Part 1</a><br /> +<a class='textlink' href='./2021-06-05-gemtexter-one-bash-script-to-rule-it-all.html'>2021-06-05 Gemtexter - One Bash script to rule it all</a><br /> +<a class='textlink' href='./2021-05-16-personal-bash-coding-style-guide.html'>2021-05-16 Personal Bash coding style guide</a><br /> <br /> <a class='textlink' href='../'>Back to the main site</a><br /> <p class="footer"> -Generated by <a href="https://codeberg.org/snonux/gemtexter">Gemtexter 2.1.0-release</a> | -served by <a href="https://www.OpenBSD.org">OpenBSD</a>/<a href="https://man.openbsd.org/httpd.8">httpd(8)</a> | -<a href="https://www.foo.zone/site-mirrors.html">Site Mirrors</a> +Generated with <a href="https://codeberg.org/snonux/gemtexter">Gemtexter 3.0.1-develop</a> | +served by <a href="https://www.OpenBSD.org">OpenBSD</a>/<a href="https://man.openbsd.org/relayd.8">relayd(8)</a>+<a href="https://man.openbsd.org/httpd.8">httpd(8)</a> | +<a href="https://foo.zone/site-mirrors.html">Site Mirrors</a> </p> </body> </html> |