From 10d1d2a6124935e5ec9d76e50f67df8f582e112f Mon Sep 17 00:00:00 2001
From: Johannes Stoelp <johannes.stoelp@gmail.com>
Date: Wed, 1 May 2024 15:40:47 +0200
Subject: tr: add notes

---
 src/cli/README.md |  1 +
 src/cli/tr.md     | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100644 src/cli/tr.md

(limited to 'src/cli')

diff --git a/src/cli/README.md b/src/cli/README.md
index 53c64b7..2625899 100644
--- a/src/cli/README.md
+++ b/src/cli/README.md
@@ -4,3 +4,4 @@
 - [sed](./sed.md)
 - [column](./column.md)
 - [sort](./sort.md)
+- [tr](./tr.md)
diff --git a/src/cli/tr.md b/src/cli/tr.md
new file mode 100644
index 0000000..a878924
--- /dev/null
+++ b/src/cli/tr.md
@@ -0,0 +1,39 @@
+# tr(1)
+
+```
+tr [opt] str1 [str2]
+    -d      delete characters in str1
+    -s      squeeze repeating sequence of characters in str1
+```
+
+## Examples
+
+### To lower
+```sh
+echo MoOsE | tr '[:upper:]' '[:lower:]'
+# output: moose
+```
+
+### Replace characters
+```sh
+echo moose | tr 'o' '-'
+# output: m--se
+
+echo moose | tr 'os' '-'
+# output: m---e
+```
+
+### Remove specific characters
+```sh
+echo moose | tr -d 'o'
+# output: mse
+
+echo moose | tr -d 'os'
+# output: me
+```
+
+### Squeeze character sequences
+```sh
+echo moooooossse | tr -s 'os'
+# output: mose
+```
-- 
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