Update modification time of photo/video according to EXIF data using command line.

Find images with specific dimension using Linux command line.

Copy files to Android smart phone without losing timestamps.

Build an offline copy of a website made by Pelican static site generator.

Use regular expresion groups to replace texts in Vim.

Pass command-line arguments to make and then pass then arguments to Go program in Makefile.

Upgrade from Ubuntu Linux 17.10 to 18.04 and disk space runs out quickly. And how I fix this issue.

List .go source files excluding _test.go files via find and grep command in bash.

List folder size in descending and ascending order via du and sort command in bash.

Check if a program (or command), such as wget or ffmpeg, is available in Go.

Use ffmpeg to merge Instagram video and audio of live replay shared to stories.

Check if Makefile runs on Travis CI or not.

Example of Makefile rules for Go linters.

Create gh-pages branch and publish your static website to GitHub Pages in Makefile.

Replace specific pattern of strings in HTML files under directory via sed.

Replace specific pattern of strings in HTML files under directory via sed.

Get prefix or suffix of a string in Makefile.

Concatenate and minify JavaScript files via Makefile, curl, and online Google Closure Compiler.

Concatenate and minify JavaScript files via Bash script, curl, and online Google Closure Compiler.

Publish your static website to GitHub project pages via ghp-import in Makefile.

Given an installed package name on Ubuntu Linux, find its version in Makefile.

Copy large number of files efficiently via Bash script on Linux.

Find redundant files saved by Chrome browser via Bash script.

Use find command to find all files with specific name and delete them in one line of command.

Use find command to find all HTML files in a directory, but exclude the HTML files in some sub-directory.

Run wkhtmltopdf on Travis CI, which convert HTML files with chinese characters to PDF.

Convert HTML files in directory to PDF recursively via wkhtmltopdf and Bash script.

Remove execute(x) permission of files in directory recursively via chmod command and Bash script.

Example of copy local files to remote machine which allows only SSH key login via rsync command.

Upgrade from AWS EC2 t1.micro running Ubuntu 12.04 LTS with Apache-2.2 to t2.nano running Ubuntu 14.04 LTS with Apache-2.4.

Create or migrate user account with SSH login only (no password login) on AWS EC2 t2.nano with Ubuntu 14.04 LTS.

Move large number of files via tar command under Bash. This is much quicker than mv command if there are a lot of small files.

Convert the format (Big5 encoding to UTF-8, remove DOS newline in file, replace string big5 with UTF-8, and append UNIX newline to end of file) of HTML files in directory via Bash script.

Convert the name of files in directory to lowercase via Bash script.

Convert encoding of file from Big5 to UTF-8, remove DOS newline in file, replace string big5 with UTF-8, and append UNIX newline to end of file.

Example for how to replace a string in a variable in Makefile.

Make reStructuredText links of the same name anonymous via regular expression by sed stream editor.

Replace footnote in reStructuredText format via regular expression by sed stream editor.

Replace footnote in reStructuredText format via regular expression in Vim editor.

Makefile's notdir = Python basename / Go path.Base.

Insert a line after first pattern match via sed stream editor.

Convert all files in a directory recursively (i.e., including subdirectories of the directory) from Big5 encoding to UTF-8 via iconv command.

Append text at the beginning of each line via sed stream editor.

Convert Traditional Chinese PO file to Simplified Chinese via OpenCC and sed in Makefile.

Concatenate and Minify CSS via sed and tr command in Makefile.

Makefile - Create symbolic link if it does not exist. Otherwise do nothing.

Write a bash script to convert wav to mp3 via ffmpeg on Ubuntu Linux 15.10.

mkdir -p command in Go

mkdir -p command in Python

echo colorful output in Makefile.

Makefile - Create a directory if it does not exist. Otherwise do nothing.

Write a bash script to use wget to fetch webpages.

List all files in a directory recursively (i.e., including subdirectories of the directory), and use sed to rename the files.