shell

Introduction

This is the training ground for shell.

Example

Move file to a not exist dir

# `mkdir --parents` equal to `mkdir -p`
# $_ expands to the last argument passed to the previous shell command, ie: the newly created directory.
mkdir --parents ./some/path; mv youfile.txt $_

Replace all string in certain dir

sed -i "s/Before_str/After_str/g" `grep Before_str -rl ./some/path`

Wget dowload continue

# -c,  --continue                  resume getting a partially-downloaded file
wget -c <download_url>

Debug bash scripts

bash -x xxx.sh

ShellCheck

ShellCheck is a GPLv3 tool that gives warnings and suggestions for bash/sh shell scripts.

Installation

sudo apt install shellcheck

Reference Links

• https://github.com/koalaman/shellcheck
• https://github.com/koalaman/shellcheck/wiki
• https://www.shellcheck.net/