Useful linux/unix commands

SCP (Secure Copy)

Command

$ scp source_file_path destination_file_path

The file path should include the full host address, port number, username and password

Copy a directory

$ scp -v -r ~/Downloads root@192.168.1.1:/root/Downloads

Transfer multiple files

$ scp foo.txt bar.txt username@remotehost:/path/directory/

or

$ scp username@remotehost:/path/directory/\{foo.txt,bar.txt\} .

$ scp root@192.168.1.3:~/\{abc.log,cde.txt\} .

Copy files across 2 remote hosts

$ scp user1@remotehost1:/some/remote/dir/foobar.txt user2@remotehost2:/some/remote/dir/

Speed up the transfer with compression

scp -vrC ~/Downloads root@192.168.1.3:/root/Downloads

CP (Copy)

MV (Move)

Find

Search for all files in a specific directory

$ find /path/to/file/

or search files in the current directory

$ find .

To search for a file named e.g “softwares” under current directory

$ find . -iname filename

Search using a wildcard

$ find /path/to/file/ -iname filename*

Search based on date and time

mtime (Modification time): when the file’s content was modified last time. atime (Access time): when the file was accessed last time. ctime (Change time): when the file attributes were modified last time.

Search for files in a current directory that were modified less than 2 days ago

$ find . -mtime -2

Search for files that were accessed less than 2 days ago

$ find . –atime -2

Search for files that were changed less than 2 days ago

$ find . –ctime -2

Search based on file size

Search file whose size is larger than 5MB size

$ find . –size +5M\

Search based on file permissions

Find files with specific permission

$ find . –type f –perm 644