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Merge pull request #1220 from mtking2/bash-cheatsheet 

Update bash.md
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Rico Sta. Cruz 2019-10-15 20:30:10 +11:00 committed by GitHub
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@ -3,7 +3,7 @@ title: Bash scripting
category: CLI category: CLI
layout: 2017/sheet layout: 2017/sheet
tags: [Featured] tags: [Featured]
updated: 2019-03-23 updated: 2019-10-02
keywords: keywords:
- Variables - Variables
- Functions - Functions
@ -393,7 +393,7 @@ Note that `[[` is actually a command/program that returns either `0` (true) or `
if ping -c 1 google.com; then if ping -c 1 google.com; then
echo "It appears you have a working internet connection" echo "It appears you have a working internet connection"
fi fi
```` ```
```bash ```bash
if grep -q 'foo' ~/.bash_history; then if grep -q 'foo' ~/.bash_history; then
@ -735,6 +735,7 @@ read -n 1 ans # Just one character
| `$?` | Exit status of last task | | `$?` | Exit status of last task |
| `$!` | PID of last background task | | `$!` | PID of last background task |
| `$$` | PID of shell | | `$$` | PID of shell |
| `$0` | Filename of the shell script |
See [Special parameters](http://wiki.bash-hackers.org/syntax/shellvars#special_parameters_and_shell_variables). See [Special parameters](http://wiki.bash-hackers.org/syntax/shellvars#special_parameters_and_shell_variables).