Learn the most efficient methods to check if a string contains a substring in Bash. Compare built-in operators, case statements, grep, and regex approaches with performance benchmarks and best practices.
Learn how to properly delete exported environment variables in Unix/Linux systems using the unset command and shell configuration files. Complete guide with troubleshooting tips.
Master recursive file searching with wildcard patterns on Linux, macOS, and Windows. Includes find command, PowerShell, and cross-platform solutions with practical examples.
Learn multiple methods to concatenate string variables in Bash including simple juxtaposition, += operator, printf command, and command substitution. Complete guide with practical examples for PHP developers transitioning to Bash.
Learn how to count lines in text files using Linux terminal commands without opening them. Discover the wc -l command and alternative methods for efficient file analysis in Linux.
Learn the most efficient ways to recursively search for text patterns across all directories and subdirectories. Discover multiple grep methods, performance optimizations, and cross-platform solutions for your file searching needs.
Learn how to check if a directory exists in Bash scripts using the test command with -d operator. Complete guide with examples, error handling, and best practices for directory verification.
Learn how to reliably detect a Bash script's directory path using dirname, readlink, and realpath. Complete guide with examples for symlink resolution and directory changing.