https://github.com/codenameyau/intro-to-bash

Intro to bash with real-world examples and command-line tips
https://github.com/codenameyau/intro-to-bash

bash ci linux

Last synced: 30 days ago
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Intro to bash with real-world examples and command-line tips

• Host: GitHub
• URL: https://github.com/codenameyau/intro-to-bash
• Owner: codenameyau
• License: gpl-3.0
• Created: 2019-08-06T20:32:08.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2019-10-15T13:22:38.000Z (about 5 years ago)
• Last Synced: 2024-08-04T01:10:16.151Z (3 months ago)
• Topics: bash, ci, linux
• Size: 41 KB
• Stars: 9
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# intro-to-bash

Recommended Resources

- Official GNU reference: https://www.gnu.org/software/bash/manual/html_node/index.html

- Bash Guide for Beginners: https://www.tldp.org/LDP/Bash-Beginners-Guide/html/

## Hot Tips

### How to use variables correctly

Spacing is critical in bash since commands are separated by spaces.

Assignments, for example, should be done without spaces.

```sh

# Bad. Interprets line as 3 separate commands.

var = 'lol'

# Good. Will assign 'lol' to var.

var='lol'

```

Always use `lower_case` for local variables and `UPPER_CASE` for environment variables.

```sh

# local variable.

my_local_variable='lol'

# environment variable.

export MY_ENV_VARIABLE='lol'

```

Always use **single quotes for string literals** and **double quotes for interpolated strings**.

```sh

cat='sunny'

lol='hello $cat'

echo "$lol"

# prints

# hello $cat

```

```sh

cat='sunny'

lol="hello $cat"

echo "$lol"

# prints

# hello sunny

```

Always double quote variables unless you know what you're doing. The only exceptions

are for loops and the test expression syntax with double brackets, e.g. `[[ $name = 'cat' ]]`.

```sh

words="good boy does fine"

# Bad. Executes 4 separate commands with 1 word arg.

ls $words

# Good. Executes a single command with 4 args.

ls "$words"

```