Unary Operators are File Test operators to Test file characteristics. Example file existence, file permissions and file types can be verified using this operators. -b file is a block device file. -c file is a character device file. -d file is a directory. -e file exists. -f file is a regular file. -g file has its setgid bit set. -G file's group ID is the same as the effective group ID -h file is a symbolic link. -k file has its sticky bit set. -L file is a symbolic link. -O file is owned by the shell's effective user ID. -p file is a pipe or named pipe -r file is readable. -s file is not empty. -S file is a socket. -u file has its set UID bit set. -w file is writable. -x file is executable Youtube PlayLists RHCE: https://goo.gl/LGTmDK Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Github: https://github.com/techtutorials Telegram Group: https://goo.gl/KPvMda | https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark | https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark | https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit | https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark | https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark | https://goo.gl/79zwX9 Whatsapp Group: http://bit.ly/wappg Telegram Group: http://bit.ly/linux-telegram AWS Free Tier Account: http://bit.ly/aws-free-tier-account