File/Directory permissions penguin@bioinfc01:~> ls -l drwxr-xr-x 2 penguin users … scripts drwxr-xr-x -Directory (yes/no) -right for user, group and others -read, write and execute/open directory Access flags owner groupfile/directory name user group other
Usefull linux commands commanddescription pwdPrint the name of the current directory lsshow the files in a directory manOpen the manual page for a certain command cdChange directory fileExamine a file morePrint the contents of a text file (try also ‘less’) perlRun a perl script psList the running processes topList the active processes, updating killTerminate a process, try also 'pkill' and 'kill -9'
and more... commanddescription exitClose the current shell (also ctrl+d) sshOpen a connection to a remote computer cpCopy a file to a new location mvMove a file to a new location (or rename a file) rmRemove/delete a file mkdirCreate a new directory rmdirRemove a directory echoPrint a text findFind a file grepFind a text in one or more files
and even more... commanddescription screenstart a virtual terminal, if you want to switch off PC scpsecure network copy catprint the contents of a file to the terminal watchmonitor the output of a shell command tailprint the last lines of a text file, continuously headprint the first lines of a text file tarcreate of read a tarball archive gzipzip a file, use gunzip to unzip dateprint current date/time lncreate a (soft) link to a file, like a shortcut
... commanddescription suswitch to another user, default is 'root' sudoact as another user, password required zypperinstall new software, other flavours: apt-get, yum rebootreboot Linux shutdownshutdown the Linux environment printenvprint the environment variables setenvset the environment variables, depends on shell passwdchange your password