unix_corner

unix_corner.md

Unix corner

Disk usage

df

Human readable file/folder size

du -hs /path/to/folder

-s: summary
-h: humanreadable

Recursive copy

cp -r source_DIR dest_DIR

Tar and untar

tar -zcvf prog-1-jan-2005.tar.gz /home/jerry/prog 

tar -zxvf prog-1-jan-2005.tar.gz or tar -zxvf prog-1-jan-2005.tar.gz -C /tmp

-z: Compress archive using gzip program
-c: Create archive
-v: Verbose i.e display progress while creating archive
-x: Extract files
-f: Archive File name

Change owner

chown username somefile 
chown username:usergroup somefile
chown -R username somedir

Symlink

ln -nfs [SOURCE] [DEST]

Crontab

crontab -l      View crontab file, if any
crontab -r      Remove crontab file, if any
crontab -e      Edit (or create) user's crontab file (starts the editor automatically)
crontab file    Replace existing crontab file (if any) with file

Find out where app or something is installed

locate java
which java

Simple SCP Command run from local linux

scp [email protected]:file_dump.sql /home/username/local/folder/