![apt - get update](https://openlab.citytech.cuny.edu/malvarez/files/2014/11/apt-get-update.png)
apt-get update is a command used to update the system packages from the repository.
![ping](https://openlab.citytech.cuny.edu/malvarez/files/2014/11/ping.png)
Ping is a command use to determine if a remote location is reachable
![netstat](https://openlab.citytech.cuny.edu/malvarez/files/2014/11/netstat.png)
netstat is a command use to print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships.
![wget](https://openlab.citytech.cuny.edu/malvarez/files/2014/11/wget1.png)
wget stands for “web get”. It is a command-line utility which downloads files over a network.
![locate](https://openlab.citytech.cuny.edu/malvarez/files/2014/11/locate.png)
locate command finds files by name
![gzip](https://openlab.citytech.cuny.edu/malvarez/files/2014/11/gzip.png)
gzip is a command used to compress one or more files. Here I compressed cat.txt
![gunzip](https://openlab.citytech.cuny.edu/malvarez/files/2014/11/gunzip.png)
gunzip is a command that decompress files. So what we did for gzip it added cat.txt.gz, so we use gunzip to decompress it and back to cat.txt
![tar](https://openlab.citytech.cuny.edu/malvarez/files/2014/11/tar.png)
tar is a command use to archivie files. So I created cat.txt.tar
![zip & unzip](https://openlab.citytech.cuny.edu/malvarez/files/2014/11/zip-unzip.png)
zip program is used to package and compress files. And unzip command lists, extracts, and tests compressed files in a ZIP archive.