This book is a compendium of the realization of practices in the module of Operating Systems Single-user. It is focused on the basic realization of knowledge practices on content and the acquisition of skills, to be able to join a job, based on the professional family. Different operating systems are discussed in Linux: Fedora, Slackware, Debian, Ubuntu, Lubuntu, some variant and Android. Commands that are used: fdisk, gdisk, mount, umount, fsck, bklib, tune2fs, uuidgen, edquota, quota, quotacheck, quotaon, quotaoff, repquota, warnquota, touch, nano, pico, echo, umask, cat, less, more , rm, mv, chmod, chown, less, pg, wc, head, tail, cut, locate, ls, slocate, whereis, whatis, find, grep, ln, egrep, mount, umount, lsusb, eject, fuser, sort , comm, diff, gzip, gunzip, zcat, zmore, zcmp, zdiff, symlink, cal, ncal, tar, calendar, date, uptime, lwclock, watch, set, env, alias, unalias, uniq, sum, lsof, paste , lshal, biosdecode, lsattr, chattr, dmidecode.