bash-linux

Original：🇺🇸 English

Translated

Bash/Linux terminal patterns. Critical commands, piping, error handling, scripting. Use when working on macOS or Linux systems.

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Sourcedavila7/claude-code-templates

Added on2026-02-04

NPX Install

npx skill4agent add davila7/claude-code-templates bash-linux

SKILL.md Content

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Bash Linux Patterns

Essential patterns for Bash on Linux/macOS.

1. Operator Syntax

Chaining Commands

Operator	Meaning	Example
`;`	Run sequentially	`cmd1; cmd2`
`&&`	Run if previous succeeded	`npm install && npm run dev`
`\|\|`	Run if previous failed	`npm test \|\| echo "Tests failed"`
`\|`	Pipe output	`ls \| grep ".js"`

2. File Operations

Essential Commands

Task	Command
List all	`ls -la`
Find files	`find . -name "*.js" -type f`
File content	`cat file.txt`
First N lines	`head -n 20 file.txt`
Last N lines	`tail -n 20 file.txt`
Follow log	`tail -f log.txt`
Search in files	`grep -r "pattern" --include="*.js"`
File size	`du -sh *`
Disk usage	`df -h`

3. Process Management

Task	Command
List processes	`ps aux`
Find by name	`ps aux \| grep node`
Kill by PID	`kill -9 <PID>`
Find port user	`lsof -i :3000`
Kill port	`kill -9 $(lsof -t -i :3000)`
Background	`npm run dev &`
Jobs	`jobs -l`
Bring to front	`fg %1`

4. Text Processing

Core Tools

Tool	Purpose	Example
`grep`	Search	`grep -rn "TODO" src/`
`sed`	Replace	`sed -i 's/old/new/g' file.txt`
`awk`	Extract columns	`awk '{print $1}' file.txt`
`cut`	Cut fields	`cut -d',' -f1 data.csv`
`sort`	Sort lines	`sort -u file.txt`
`uniq`	Unique lines	`sort file.txt \| uniq -c`
`wc`	Count	`wc -l file.txt`

5. Environment Variables

Task	Command
View all	`env` or `printenv`
View one	`echo $PATH`
Set temporary	`export VAR="value"`
Set in script	`VAR="value" command`
Add to PATH	`export PATH="$PATH:/new/path"`

6. Network

Task	Command
Download	`curl -O https://example.com/file`
API request	`curl -X GET https://api.example.com`
POST JSON	`curl -X POST -H "Content-Type: application/json" -d '{"key":"value"}' URL`
Check port	`nc -zv localhost 3000`
Network info	`ifconfig` or `ip addr`

7. Script Template

bash

#!/bin/bash
set -euo pipefail  # Exit on error, undefined var, pipe fail

# Colors (optional)
RED='\033[0;31m'
GREEN='\033[0;32m'
NC='\033[0m'

# Script directory
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

# Functions
log_info() { echo -e "${GREEN}[INFO]${NC} $1"; }
log_error() { echo -e "${RED}[ERROR]${NC} $1" >&2; }

# Main
main() {
    log_info "Starting..."
    # Your logic here
    log_info "Done!"
}

main "$@"

8. Common Patterns

Check if command exists

bash

if command -v node &> /dev/null; then
    echo "Node is installed"
fi

Default variable value

bash

NAME=${1:-"default_value"}

Read file line by line

bash

while IFS= read -r line; do
    echo "$line"
done < file.txt

Loop over files

bash

for file in *.js; do
    echo "Processing $file"
done

9. Differences from PowerShell

Task	PowerShell	Bash
List files	`Get-ChildItem`	`ls -la`
Find files	`Get-ChildItem -Recurse`	`find . -type f`
Environment	`$env:VAR`	`$VAR`
String concat	`"$a$b"`	`"$a$b"` (same)
Null check	`if ($x)`	`if [ -n "$x" ]`
Pipeline	Object-based	Text-based

10. Error Handling

Set options

bash

set -e          # Exit on error
set -u          # Exit on undefined variable
set -o pipefail # Exit on pipe failure
set -x          # Debug: print commands

Trap for cleanup

bash

cleanup() {
    echo "Cleaning up..."
    rm -f /tmp/tempfile
}
trap cleanup EXIT

Remember: Bash is text-based. Use
&&
for success chains,
set -e
for safety, and quote your variables!

bash-linux

NPX Install

Tags

SKILL.md Content

Bash Linux Patterns

1. Operator Syntax

Chaining Commands

2. File Operations

Essential Commands

3. Process Management

4. Text Processing

Core Tools

5. Environment Variables

6. Network

7. Script Template

8. Common Patterns

Check if command exists

Default variable value

Read file line by line

Loop over files

9. Differences from PowerShell

10. Error Handling

Set options

Trap for cleanup