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• Search for a pattern string in a directory

grep -rnw /path/to/dir -e 'pattern_string_to_match'

• Let the Terminal speak

say -v ?

to list the voice options.

say -v Alex --r=150 hello sir

• Ping a remote host

ping www.HOSTNAME.COM

• How long is the HOST up

uptime

Sample Output of uptime:

11:50 up 6 days, 21:41, 4 users, load averages: 3.20 15.22 11.69

• Check disk usage of a directory

du -sh /path/to/directory

Sample output of du: 678M /Users/HOSTNAME/Documents/

This means that my documents folder has occupied 678 MB of space on disk

• Check the weather in any city

curl http://wttr.in/LOCATION

Enter your city name in LOCATION

• Download a file from the internet

We can use wget for this. Do a brew install wget on macOS or apt-get install wget on Linux

wget -O windows-security.pdf https://d1.awsstatic.com/whitepapers/aws-microsoft-platform-security.pdf

The command above downloads the pdf file at the URL resource, renames it and saves it in the current directory.

Sample Output:

Resolving d1.awsstatic.com (d1.awsstatic.com)... 13.225.6.181 Connecting to d1.awsstatic.com (d1.awsstatic.com)|13.225.6.181|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 1221064 (1.2M) [application/pdf] Saving to: ‘windows-security.pdf’

windows-security.pdf 100%[======================================================================================>] 1.16M 885KB/s in 1.3s

2019-10-07 12:10:42 (885 KB/s) - ‘windows-security.pdf’ saved [1221064/1221064]