Useful unix commands (practical quick examples)

useful-unix-commands.md

Find

find files using name in the current directory

find . -name filename.txt

find files ignoring case

find / -type d -name filename

find all rb file with name

find . -type f -name *.rb

find all file with/without 777 permissions

find . -type f -perm 0777 -print

find / -type f ! -perm 777

fnd all executable files

find / -perm /a=x

Find Files with 777 Permissions and Chmod to 644

find / -type f -perm 0777 -print -exec chmod 644 {} \;

find and remove a single file

find . -type f -name "filename.txt" -exec rm -f {} \;

find and remove multiple files

find . -type f -name "*.txt" -exec rm -f {} \;

OR

find . -type f -name "*.mp3" -exec rm -f {} \;

find all empty directories

find /tmp -type d -empty

find all hidden files

find /tmp -type f -name ".*"

Netstat

list all the listening ports of tcp and udp

netstat -a | more

list all tcp/udp port connections

netstat -at

netstat -au

list all listening ports

netstat -l

list all unix listening ports

netstat -lx

display service name with PID

netstat -tp

find listening programs running on a port

netstat -ap | grep http