Commands by alikhalil (10)

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Replace multiple spaces with semicolon

take a look to command before action
add |sh when you agree the list, I often use that method to prevent typos in dangerous or long operations

Scan Subnet for IP and MAC addresses

Leap year calculation

Don't save commands in bash history (only for current session)
Unsetting HISTFILE avoid getting current session history list saved.

Compare copies of a file with md5

Generate QR code for a WiFi hotspot
Prompts for network name (SSID) and password, and generates (as qr-wifi.png) a WiFi QR code (e.g. "WIFI:S:mynet;T:WPA;P:mypass;;" for mynet/mypass). Dependencies [sudo apt-get install]: qrencode zenity

Recursive find and replace file extension / suffix (mass rename files)
Find recursively all files in ~/Notes with the extension '.md' and pipe that via xargs to rename command, which will replace every '.md' to '.txt' in this example (existing files will not be overwritten).

check open ports without netstat or lsof

Burn CD/DVD from an iso, eject disc when finished.
cdrecord -scanbus will tell you the (x,y,z) value of your cdr (for example, mine is 3,0,0)


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