Util-linux is a suite of essential utilities for any Linux system. Its primary audience is system integrators and DIY Linux hackers. Util-linux is attempting to be portable, but the only platform it has been tested much on is Linux i386. It contains the following programs: agetty arch blockdev cal cfdisk chfn chkdupexe chsh clear col colcrt colrm column ctrlaltdel cytune ddate dmesg elvtune fastboot fasthalt fdformat fdisk fsck.cramfs fsck.minix getopt halt hexdump hwclock initctl ipcrm ipcs isosize kill last line logger login look mcookie mesg mkfs mkfs.bfs mkfs.cramfs mkfs.minix mkswap more mount namei need passwd pg pivot_root ramsize raw rdev readprofile reboot rename renice rescuept reset rev rootflags script setfdprm setsid setterm sfdisk shutdown simpleinit sln swapoff swapon tunelp ul umount vidmode vipw wall whereis write.
The Schily Tool Box is a set of tools including programs like: cdrecord, cdda2wav, readcd, mkisofs, smake, bsh, btcflash, calc, calltree, change, compare, count, devdump, hdump, isodebug, isodump, isoinfo, isovfy, label, mt, od, p, patch, sccs, scgcheck, scpio, sdd, sfind, sformat, smake, sh, star, star_sym, suntar, gnutar, tartest, termcap, and ved.
BusyBox combines tiny versions of many common UNIX utilities into a single small executable. It provides replacements for most of the utilities you usually find in GNU fileutils, shellutils, etc. The utilities in BusyBox generally have fewer options than their full-featured GNU cousins; however, the options that are included provide the expected functionality and behave very much like their GNU counterparts. BusyBox provides a fairly complete environment for any small or embedded system.
GNU grep is based on a fast lazy-state deterministic matcher (about twice as fast as stock Unix egrep) hybridized with a Boyer-Moore-Gosper search for a fixed string that eliminates impossible text from being considered by the full regexp matcher without necessarily having to look at every character. The result is typically many times faster than Unix grep or egrep.
The logrotate utility is designed to simplify the administration of log files on a system which generates a lot of log files. Logrotate allows for the automatic rotation compression, removal and mailing of log files. Logrotate can be set to handle a log file daily, weekly, monthly or when the log file gets to a certain size.