Posts on X2Q tagged command-line. Updated as new posts are published.
xmllint (part of libxml2, already on most systems) reformats ugly, minified, or single-line XML into something readable. Pipe an API response straight through it, control the indent width, and validate while you're at it.
Windows uses CRLF line endings, Unix uses LF — and the mismatch breaks shell scripts, configs, and diffs. dos2unix converts them in place; on Debian/Ubuntu it's now its own package (no more tofrodos). Includes a recursive batch and a sed fallback.
find -printf with sort gives you a newest-last list of every file in a tree; -mmin/-mtime filter by age. macOS's BSD find lacks -printf, so this covers the portable variants too. Handy for 'what just changed on this server?'
iconv converts a text file from one character encoding to another. Detect what you have with file -i, convert with iconv -f FROM -t TO, and use //TRANSLIT or //IGNORE for characters the target charset can't represent. Includes a recursive batch one-liner.