Unix Tools

Implementations of common Unix command-line utilities written in C.

• cat — print and concatenate files.
• echo — print arguments.
• pwd — print the working directory.
• mkdir — create directories.
• touch — create files or update timestamps.
• wc — count lines, words, and bytes.
• head — print the first N lines of a file.
• tail — print the last N lines of a file.
• cp — copy files.
• grep — search text for patterns.
• ls — list directory contents.
• date — display the date and time.