makeindexCaptures a complete directory tree in a single HTML file. Useful to create browsable indices of your documents. trashAn alternative to the "rm" command, allowing some rough undelete functionality. rgrepThe recursive grep you have ever dreamed of. optimize_pathRemoves double entries from your ever-growing $PATH. dec2binDecimal to binary number converter. dec2hexDecimal to hexadecimal number converter. hex2decHexadecimal to decimal number converter.