Bash - String Manipulation

Bash String Manipulation Code

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Overview

Bash scripting provides several ways to manipulate strings. Here are some common techniques:

1. Substring Extraction: You can extract a substring from a string using the syntax ${string:start:length}. For example, if str="Hello, World!", then ${str:7:5} will return World.

2. String Length: You can get the length of a string using the syntax ${#string}. For example, if str="Hello, World!", then ${#str} will return 13.

3. String Replacement: You can replace the first occurrence of a substring in a string using the syntax ${string/substring/replacement}. If you want to replace all occurrences, use ${string//substring/replacement}. For example, if str="Hello, World!", then ${str/o/0} will return Hell0, World! and ${str//o/0} will return Hell0, W0rld!.

4. Substring Removal: You can remove the shortest/longest part of a string matching a pattern from the beginning/end of the string. For example, ${string#substring} removes the shortest match from the beginning, ${string##substring} removes the longest match from the beginning, ${string%substring} removes the shortest match from the end, and ${string%%substring} removes the longest match from the end.

5. String Concatenation: You can concatenate strings simply by writing them one after another. For example, str1="Hello, "; str2="World!"; str3=$str1$str2 will make str3 contain Hello, World!.

6. String Comparison: You can compare strings using comparison operators. For example, if [ "$str1" == "$str2" ] checks if str1 and str2 are equal.

7. String to Lowercase/ Uppercase: You can convert a string to lowercase or uppercase using ${string,,} and ${string^^} respectively. For example, if str="Hello, World!", then ${str,,} will return hello, world! and ${str^^} will return HELLO, WORLD!.

Remember, string manipulation in Bash is quite different from other programming languages, so it’s important to understand these techniques and how to use them effectively.

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See Also

• Bash Code Snippets
• Linux, Ubuntu, Kali Linux
• Zsh
• Development Map of Content
• Windows Sub-System for Linux (WSL)

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Appendix

Note created on 2024-05-17 and last modified on 2024-05-17.

See Also

Backlinks

LIST FROM [[Bash - String Manipulation]] AND -"CHANGELOG" AND -"04-RESOURCES/Code/Bash/Bash - String Manipulation"

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