Commands by dinomite (6)

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separate (emphasize) digital strings from other text

Every Nth line position # (AWK)
A better way to show the file lines 3n + 1

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

Stoppable sleep
A nice way to interrupt a sleep with a signal.

Find the package that installed a command

watch process stack, sampled at 1s intervals
This command repeatedly gets the specified process' stack using pstack (which is an insanely clever and tiny wrapper for gdb) and displays it fullscreen. Since it updates every second, you rapidly get an idea of where your program is stuck or spending time. The 'tac' is used to make the output grow down, which makes it less jumpy. If the output is too big for your screen, you can always leave the 'tac' off to see the inner calls. (Or, better yet--get a bigger screen.) Caveats: Won't work with stripped binaries and probably not well with threads, but you don't want to strip your binaries or use threads anyway.

rename files according to file with colums of corresponding names
Maybe simpler, but again, don't know how it will work with space in filename.

remove recursively all txt files with number of lines less than 10

Put public IP address in a variable

Download SSL server certificate with opsnessl
Useful when we need to create new certificate for site when current one is near expiry. This downloaded cert can be used to provide organisational data directly to new cert. using below command. e.g. openssl x509 -x509toreq -in /tmp/example.com.cert -out example.com.csr -signkey example.com-key.pem


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