~ /home/ya pwd show path uname -a print system info `uname -a` in bash excute it and replace with command output chmod change permission: chmod X@Y file1 file2 ... where: X is any combination of the letters `u' (for owner), `g' (for group), `o' (for others), `a' (for all; that is, for `ugo'); @ is either `+' to add permissions, `-' to remove permissions, or `=' to assign permissions absolutely; and Y is any combination of `r', `w', `x' read write execute touch create file internet ifconfig internet config programming ls -al show dir content ls -al show dir content ls -al show dir content ls -al show dir content user management passwd userName set password to user su userName change user exit log out userdel userName -r delete user. -r with user dir. system sudo shutdown -r 0 reboot через 0 секунд ctrl+alt+F1-9 run console in full screen mode clear clear terminal Symbolic Notation N...