GNU textutils documents the GNU text utilities, including: * Output of entire files -- cat, tac, nl, od * Formatting file contents -- fmt, pr, fold * Output of parts of files -- head, tail, split, csplit * Summarizing files -- wc, sum, cksum, md5sum * Operating on sorted files -- sort, uniq, comm * Operating on fields within a line -- cut, paste, join * Operating on characters -- tr, expand, unexpand The GNU text utilities are mostly compatible with the POSIX.2 standard. This book is a printed version of the GNU texinfo documentation, available online from the Free Software Foundation.