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tree command limit depth for recusive directory list
sometimes I need list from path with max limit for recursive depth directory listing

Calculate sum of N numbers (Thanks to flatcap)
replaces "\n" with "+"

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.

What is my public IP-address?
alternative to $curl ifconfig.me for those that don't have curl

Show exit status of all portions of a piped command eg. ls |this_doesn't_exist |wc

Extracting a range of pages from a PDF, using GhostScript
In this example we extract pages 14-17

chroot, bind mount without root privilege/setup
PRoot is a user-space implementation of chroot, mount --bind, and binfmt_misc. This means that users don't need any privileges or setup to do things like using an arbitrary directory as the new root filesystem, making files accessible somewhere else in the filesystem hierarchy, or executing programs built for another CPU architecture transparently through QEMU user-mode. Also, developers can use PRoot as a generic Linux process instrumentation engine thanks to its extension mechanism, see CARE for an example. Technically PRoot relies on ptrace, an unprivileged system-call available in every Linux kernel. https://github.com/cedric-vincent/PRoot

Connect via SSH to VirtualBox guest VM without knowing IP address
Booting the VM headless via VBoxHeadless requires knowledge of the VM's network in order to connect. Using VBoxManage in this way and you can SSH to the VM without first looking up the current IP, which changes depending on how you have your VM configured.

Show File System Hierarchy
Curious about differences between /bin, /usr/bin, and /usr/local/bin? What should be in the /sbin dir? Try this command to find out. Tested against Red Hat & OS X

shuffle lines via perl
Same, without modules... Probably smarter option: just use the shuf command or even sort -R.


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