Useful commands
This is a small list of commands to learn to start getting functional at the command line in Linux. To say that these are the barest minimum to learn is a remarkable understatement. Work through the exercise at the end of basic everyday commands before continuing through the rest of this page. There is an LIN:exercise at the bottom of this page as well as some on the pages for grep, sed, awk and others.
Page view
- 1. Dangerous Commands or procedures
- 2. basic everyday commands
- 3. ssh, scp and rsync
- 4. grep
- 5. sed
- 6. awk
- 7. lsof
- 8. netstat
- 9. screen
- 10. chkconfig
- 11. mount
- 12. help
- 13. diff and patch
Command view
Dangerous Commands or procedures
basic everyday commands
ssh and scp
ssh is the Secure SHell used to connect to every remote machine. It provides a fully encrypted connection between system that can then be used for command line operation or even for tunneling insecure application through the secure ssh tunnel.grep
grep is used for finding strings within files or groups of files.sed
sed is a stream editor.awk
awk is a filter and output writer.lsof
lsof will list open files, ports and sockets. A file is open if it is in use by some process.netstat
Netstat will print connection information. It is often a first tool in play for a network failure.screen
screen is a window manager for the console.
Long running process should be run within screen so a lost connection will not stop the process.chkconfig
chkconfig is the command line tool to setup init scripts for different runlevels.mount
mount is used to attach a device to the filesystem for use.help
Online, built-in help is available for (nearly) every command in /sbin, /bin, /usr/bin and /usr/sbindiff and patch
find changed files and perform merges.
Useful commands exercise
 | Use scp to get the file useful_commands.tar.gz from /tmp on the host svn The instruction are in the README file |