The s Permission Bit in chmod
An explanation of the setuid and setgid permission bits, their numeric forms, and their effects on files and directories.
Tag: linux
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LINUX Common Ubuntu Problems and Operations
A troubleshooting notebook for Ubuntu issues involving NVIDIA drivers, missing GPG keys, and PPA management.
Installing Common Software on Ubuntu
Installation notes for GCC 5 and Fcitx on Ubuntu, including compiler symlinks and language-support configuration.
Basic Linux User, System, and Package Commands
A compact command reference for Linux users, permissions, system information, package management, and Vim.
Calculating Response-Time Statistics with awk
A one-pass shell and awk workflow for calculating minimum, maximum, and average response times across Nginx logs.
Joining Two Files Line by Line with awk
An awk associative-array technique for matching the first field and joining corresponding records from two files.
Fixing Missing Audio When Using HDMI on Ubuntu
Steps for restoring Ubuntu audio by switching output from HDMI to the computer's analog sound device.
A Collection of Useful Linux Commands
A collection of Linux commands for files, processes, text search, IPC, and remote work.