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Merge several pdf files into a single file
merge a.pdf b.pdf and c.pdf and create ./out.pdf

Run a command for blocks of output of another command
The given example collects output of the tail command: Whenever a line is emitted, further lines are collected, until no more output comes for one second. This group of lines is then sent as notification to the user. You can test the example with $ logger "First group"; sleep 1; logger "Second"; logger "group"

Connect to FreeWifi hotspot (France) and keep the connection active
(In French) Connection aux hotspots FreeWifi, et maintien de la connection active

Find Files That Exceed a Specified Size Limit

See the top 10 IP addresses in a web access log

Watch how fast the files in a drive are being deleted
This can be useful when a large remove operation is taking place.

Get current Xorg resolution via xrandr
Not sure if it works the same on any shell.

duration of the DNS-query

c_rehash replacement
When you don't have c_rehash handy. Really simple - if you have a .pem file that doesn't really contain a x509 cert (let's say, newreq.pem), it will create a link, simply called '.0', pointing to that file.

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.


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