linux

Shell

History

• Ctrl-R to initiate a reverse search
• history -c linux to clear all commands
• history -w linux to write history on file usually ~/.bash_history

Changing permissions

First specify which permission set you want to change (user, group, or other), then use a + to add a permission or a - to remove it.

• u (user/owner)
• g (group)
• o (others)
• a (all: user, group, and others)

Add (+) the execute (x) permission for the user (u) on a file (myfile):

chmod u+x myfile

Remove a permission, use the - operator.