Commands by metropolis (5)

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Trim png files in a folder
That should be a short as it can get.

combining streams
2>&1 permit to combinate stdout and stderr. grep will catch stderr and stdout instead of stdout only.

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Count items in JSON array
Pipe any JSON to jq, then count with the appropiate expression and use the | length on the array

get function's source
no need to reinvent the wheel. Thanks to the OP for the "obsolete" hint. 'declare' may come in pretty handy on systems paranoid about "up-to-dateness"

list block devices
Shows all block devices in a tree with descruptions of what they are.

Selecting a random file/folder of a folder
Also looks in subfolders

Display / view the contents of the manifest within a Java jar file
Displays the manifest within a jar file. Can use it to confirm version number, etc.

check open ports without netstat or lsof

tar directory and compress it with showing progress and Disk IO limits
tar directory and compress it with showing progress and Disk IO limits. Pipe Viewer can be used to view the progress of the task, Besides, he can limit the disk IO, especially useful for running Servers.


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