Useful Linux/Unix commands

How do I find all files containing specific text?

Shell

grep -rnw '/path/to/somewhere/' -e 'pattern'

1

grep -rnw '/path/to/somewhere/' -e 'pattern'
How i change the default file permissions (mask that controls file permissions)

umask

1

umask
Untar (unzip) file

tar -zxvf archive.tar.gz

1

tar -zxvf archive.tar.gz
Copy files via rsync from one host to another

rsync -av [USER@]HOST[:PORT]/SOURCE [USER@]HOST[:PORT]/DEST

1

rsync -av [USER@]HOST[:PORT]/SOURCE [USER@]HOST[:PORT]/DEST