sebastiano.tronto.net

commit 9097eb1a23bda68260a4e8a4649db2573189dfd6
parent 901d19dd4f38c1865fc952a84f52f1c2bec14169
Author: Sebastiano Tronto <sebastiano@tronto.net>
Date:   Wed, 27 Mar 2024 07:52:35 +0100

Added blog post

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src/blog/2024-02-20-head-and-tail/head-and-tail.md
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2
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src/blog/2024-03-27-rev/rev.md
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2 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/src/blog/2024-02-20-head-and-tail/head-and-tail.md b/src/blog/2024-02-20-head-and-tail/head-and-tail.md
@@ -95,3 +95,5 @@ anymore, but it was mentioning.
 
 These two utilities don't do much, but can accomplish a lot when combined
 with I/O redirection and other text filters.
+
+*Next in the series: [rev](../2024-03-27-rev)*
diff --git a/src/blog/2024-03-27-rev/rev.md b/src/blog/2024-03-27-rev/rev.md
@@ -0,0 +1,20 @@
+# UNIX text filters, part 2.3 of 3: rev
+
+*This post is part of a [series](../../series)*
+
+Of all the simple programs I am dedicating a post to in this series,
+`rev` is probably the simplest of them all.  So simple that it is
+easy to forget about: `rev` prints each line of standard input to
+standard output, reversing the order of the characters. For example:
+
+```
+$ printf 'This is\na very short post' | rev
+si sihT
+tsop trohs yrev a
+```
+
+Since [text is complicated](https://www.youtube.com/watch?v=gd5uJ7Nlvvo),
+`rev` will read the environment variable `LC_CTYPE` to determine what
+constitutes a character.
+
+And that's it. See you soon for another (longer) post in this series.