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docs/Linux-Commands/.recycle/119-the-tr-command.md

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+# The `tr` command
+
+The tr command in UNIX is a command line utility for translating or deleting characters.
+It supports a range of transformations including uppercase to lowercase, squeezing repeating characters, deleting specific characters and basic find and replace.
+It can be used with UNIX pipes to support more complex translation. tr stands for translate.
+
+### Examples:
+
+1. Convert all lowercase letters in file1 to uppercase.
+
+```
+$ cat file1
+foo
+bar
+baz
+tr a-z A-Z < file1
+FOO
+BAR
+BAZ
+```
+
+2. Make consecutive line breaks into one.
+
+```
+$ cat file1
+foo
+
+
+bar
+
+
+baz
+$ tr -s "\n" < file1
+foo
+bar
+baz
+```
+
+3. Remove the newline code.
+
+```
+$ cat file1
+foo
+bar
+baz
+$ tr -d "\n" < file1
+foobarbaz%
+```
+
+### Syntax:
+
+The general syntax for the tr command is as follows:
+
+```
+tr [options] string1 [string2]
+```
+
+### Additional Flags and their Functionalities:
+
+| **Short Flag** | **Long Flag** | **Description**                                                                                               |
+| :------------- | :------------ | :------------------------------------------------------------------------------------------------------------ |
+| `-C`           |               | Complement the set of characters in string1, that is `-C ab` includes every character except for `a` and `b`. |
+| `-c`           |               | Same as -C.                                                                                                   |
+| `-d`           |               | Delete characters in string1 from the input.                                                                  |
+| `-s`           |               | If there is a sequence of characters in string1, combine them into one.                                       |