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list files recursively by size

move a lot of files over ssh
copy files to a ssh server with gzip compression

List contents of tar archive within a compressed 7zip archive
Sometimes it is handy to be able to list contents of a tar file within a compressed archive, such as 7Zip in this instance, without having to extract the archive first. This is especially helpful when dealing with larger sized files.

Make directories for and mount all iso files in a folder

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

Sort netflow packet capture
Sort netflow packet capture by unique connections excluding source port.

extract column from csv file
extracts the 5th column using the delimiter ','

Remove lines that contain a specific pattern($1) from file($2).
The -i option in sed allows in-place editing of the input file. Replace myexpression with any regular expression. /expr/d syntax means if the expression matches then delete the line. You can reverse the functionality to keep matching lines only by using: $ sed -i -n '/myexpression/p' /path/to/file.txt

files and directories in the last 1 hour
added alias in ~/.bashrc alias lf='find ./* -ctime -1 | xargs ls -ltr --color'

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)
Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.


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