Developer tools

Check an IBAN against its ISO 7064 mod-97 checksum and split out the country and bank parts

Compare two semantic versions and say which is newer and why, following the SemVer 2.0 precedence rules

Work out the permissions new files and directories get under a given umask

Generate the current RFC 6238 time-based one-time password from a base32 secret, and show how many seconds it has left

Read a user agent string and report the browser, rendering engine, operating system and device type

Look up what a TCP or UDP port is normally used for, by number or by service name

Convert Unix file permissions between octal, symbolic rwx notation and a plain-English description

Generate an htpasswd line using the SHA-1 {SHA} scheme, for tools that still need that older format rather than bcrypt

Expand a bash brace pattern such as file{1..3}{a,b}.txt into the full list of results, with a count and a warning if the list is very large

Build a sed substitute command from a find string, a replace string and checkboxes for global, case insensitive, in place and a line range, with each flag explained

Collapse runs of spaces, trim line ends, convert tabs to spaces or back, strip zero width characters and normalise line endings, each as a separate option

Encode text to Ascii85 or decode it back, in either the Adobe variant wrapped in <~ ~> or the plain, undelimited btoa variant