# Command Line Fundamentals print working directory ; where am I ? ``` pwd ``` which user i am currently logged in with ``` whoami ``` change directory ``` cd ``` go up one directory / go back one directory ``` cd .. ``` jump to home dir ``` cd ~ ``` go to last directory ``` cd - ``` \[ concept of absolute path and relative path ] ``` ls ls /etc/ ls kali/shark ``` security ``` mkdir ``` security ``` rmdir ``` to delete recursively ``` rm -r shark ``` ``` ls -la ``` create a file named as hi.txt and put contents inside quotes inside it ``` echo "hello" > hi.txt ``` ``` cp srcfile dstfile ``` ``` mv src dst ``` mv used to rename files as well ``` mv ``` is c opy paste ``` cp ``` is cut paste ``` mv ``` shark.txt looks / search eerywhere for specific file name ``` locate ``` ``` updatedb ``` to change password by default of logged in users ``` passwd ``` passwd shark tochange passwrd of shark nameduser account to read file contents ; cat means to concat ``` cat file1.txt ``` ## Linux file permissions ``` rwx rwx rwx ``` r ->4 w-> 2 x->1 ``` chmod +r file1.txt ``` ``` chmod 777 file1.txt ``` to add new user named shark ``` adduser shark ``` Import files : does not stores password ; only stores users n account information ``` /etc/passwd ``` stores password in hasehd format look into details of both files ``` /etc/shadow ```