Text and editors

Articles

• vim — editing files in the terminal — The bare minimum for editing configs; Esc always returns to Normal mode, where letters are commands, not text.
• nano — a simple console editor — A friendly console editor — save, quit, search, for editing config files.
• Basic file commands — Navigation and files — ls, cd, cp, mv, rm, cat, less, head, tail, terminal copy-paste.
• cat — print a whole file — The cat command prints a file's contents to the terminal and joins several files into one stream.
• head — the first lines of a file — The head command prints the beginning of a file or of command output — 10 lines by default, -n sets how many.
• tail — the last lines and following a log — The tail command prints the end of a file, and with -f it keeps showing new lines as they are appended to a log.
• grep — searching text — The grep command finds lines matching a pattern in files and command output: regex, recursion, context.
• Regular expressions — patterns for grep, sed and awk — A pattern that many strings match: characters, classes like [0-9], repeats * and +, anchors ^ and $. grep searches lines by it, sed replaces text, awk selects lines.