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string shell script

[Shell script] Execute and understand; obtain error output from execution results.

created-2026/03/14 updated-2026/03/20

Introduction

This repository retrieves logs that are output when an error occurs in a command while executing a shell script.

Commands that need to be installed

  1. git

Quick Start

If you have already installed the above command, run the following command to download from the repository, then change directory and run the shell script to display the errors output by the command.

Ubuntu

git clone https://github.com/trygfmi/shellscript_get-error-log
cd shellscript_get-error-log
cat ./start_shellscript_get-error-log.sh
chmod 744 ./start_shellscript_get-error-log.sh
./start_shellscript_get-error-log.sh
cat log/command.log
cat error_log/command_error.log
Output results
hello shellscript

ls: unrecognized option `--false'
Try 'ls --help' for more information

Macos

MacPorts

source ~/bashrc_folder/macports_alias
git clone https://github.com/trygfmi/shellscript_get-error-log
cd shellscript_get-error-log
cat ./start_shellscript_get-error-log.sh
chmod 744 ./start_shellscript_get-error-log.sh
./start_shellscript_get-error-log.sh
cat log/command.log
cat error_log/command_error.log
Output results
hello shellscript

ls: unrecognized option `--false'
usage: ls [-@ABCFGHILOPRSTUWabcdefghiklmnopqrstuvwxy1%,] [--color=when] [-D format] [file ...]

Windows

WSL2

git clone https://github.com/trygfmi/shellscript_get-error-log
cd shellscript_get-error-log
cat ./start_shellscript_get-error-log.sh
chmod 744 ./start_shellscript_get-error-log.sh
./start_shellscript_get-error-log.sh
cat log/command.log
cat error_log/command_error.log
Output results
hello shellscript

ls: unrecognized option `--false'
Try 'ls --help' for more information

MSYS2 MINGW64

git clone https://github.com/trygfmi/shellscript_get-error-log
cd shellscript_get-error-log
cat ./start_shellscript_get-error-log.sh
chmod 744 ./start_shellscript_get-error-log.sh
./start_shellscript_get-error-log.sh
cat log/command.log
cat error_log/command_error.log
Output results
hello shellscript

ls: unknown option `--false'
Try 'ls --help' for more information

Execution steps

Ubuntu

Click to open details

Prior confirmation

Enter the following command into your terminal. If you don’t get a “command not found” message, then it’s OK.

git --version

preinstall

If the command you see as “command not found” in your terminal, please install it using the following command.

sudo apt install git

command

Running the following command in your terminal should output a string similar to the details shown.

git clone https://github.com/trygfmi/shellscript_get-error-log
cd shellscript_get-error-log
cat ./start_shellscript_get-error-log.sh
chmod 744 ./start_shellscript_get-error-log.sh
./start_shellscript_get-error-log.sh
cat log/command.log
cat error_log/command_error.log
Detail
hello shellscript

ls: unrecognized option `--false'
Try 'ls --help' for more information

Macos

Click to open details

Prior confirmation

If you enter the following command into the terminal and you don’t get a “command not found” message, then it’s OK.

source ~/bashrc_folder/macports_alias
git --version

*macOS uses the MacPorts package manager to manage commands. If you haven’t installed it yet, please see the MacPorts installation instructions at the link below. Also, you can set aliases for commands so that they can be called without conflicting with your existing environment. If this is your first time using this blog, please refer to the following two articles to set up your environment.

preinstall

If you encounter a “command not found” error in the terminal, install the command using the following command and then set up an alias for it.

sudo port install git
echo 'alias git="/opt/local/bin/git"' >> ~/bashrc_folder/macports_alias

command

Running the following command in the terminal should output a string similar to the details shown.

source ~/bashrc_folder/macports_alias
git clone https://github.com/trygfmi/shellscript_get-error-log
cd shellscript_get-error-log
cat ./start_shellscript_get-error-log.sh
chmod 744 ./start_shellscript_get-error-log.sh
./start_shellscript_get-error-log.sh
cat log/command.log
cat error_log/command_error.log
Detail
hello shellscript

ls: unrecognized option `--false'
usage: ls [-@ABCFGHILOPRSTUWabcdefghiklmnopqrstuvwxy1%,] [--color=when] [-D format] [file ...]

Windows

Click to open details

Prior confirmation

If you enter the following command into the prompt and you don’t get a “command not found” message, then it’s OK.

WSL2
git --version
MSYS2 MINGW64
git --version

*This has been tested on Windows using WSL2 and MSYS2 MINGW64. Please install WSL2 if possible. If you are unable to set it up, you can install MSYS2, but some commands may only work with WSL2. Please refer to the article below for instructions on how to install WSL2 and MSYS2.

preinstall

If you see a “command not found” error in the prompt, please install the command using the following command.

WSL2
sudo apt install git
MSYS2 MINGW64
pacman --sync git

command

Executing the following command at the prompt should output a string similar to the details shown.

WSL2
git clone https://github.com/trygfmi/shellscript_get-error-log
cd shellscript_get-error-log
cat ./start_shellscript_get-error-log.sh
chmod 744 ./start_shellscript_get-error-log.sh
./start_shellscript_get-error-log.sh
cat log/command.log
cat error_log/command_error.log
Detail
hello shellscript

ls: unrecognized option `--false'
Try 'ls --help' for more information
MSYS2 MINGW64
git clone https://github.com/trygfmi/shellscript_get-error-log
cd shellscript_get-error-log
cat ./start_shellscript_get-error-log.sh
chmod 744 ./start_shellscript_get-error-log.sh
./start_shellscript_get-error-log.sh
cat log/command.log
cat error_log/command_error.log
Detail
hello shellscript

ls: unknown option `--false'
Try 'ls --help' for more information

Afterword

By writing `>>` and `2>>` after a command, you can separate standard output and error output. The `2` in `2>>` is a file descriptor; when an error occurs, a string is output, so using `2>>` allows you to append the error output to the file specified in the subsequent argument.

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