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Record active input of soundcard to file.wav
You'll need sox package in Debian/Ubuntu.

cp the file
Copy the file with the given .extension at the source file's location. Eliminates the typing of long paths again and again.

List all active access_logs for currently running Apache or Lighttpd process
Ever logged into a *nix box and needed to know which webserver is running and where all the current access_log files are? Run this one liner to find out. Works for Apache or Lighttpd as long as CustomLog name is somewhat standard. HINT: works great as input into for loop, like this: $ for i in `lsof -p $(netstat -ltpn|awk '$4 ~ /:80$/ {print substr($7,1,index($7,"/")-1)}')| awk '$9 ~ /access.log$/ {print $9| "sort -u"}'` ; do echo $i; done Very useful for triage on unfamiliar servers!

connect via ssh using mac address
Instead of looking for the right ip address, just pick whatever address you like and set a static ip mapping.

Discovering all open files/dirs underneath a directory
It may be helpful in case you need to umount a directory and some process is preventing you to do so keeping the folder busy. The lsof may process the +D option slowly and may require a significant amount of memory because it will descend the full dir tree. On the other hand it will neither follow symlinks nor other file systems.

Simulate typing

Advanced python tracing
Trace python statement execution and syscalls invoked during that simultaneously

sort monthwise
sort command can sort month-wise (first three letters of each month). See the sample output for clarification. Sorting Stable ? NO. Take note if that matters to you. Sample output suggests that sort performs unstable sorting (see the relative order of two 'feb' entries).

Lists all clients of a Squid proxy
Generates the list of clients (IPs addresses) that have used the Squid webproxy according to the most recent log. Every IP appears only once in the list.

Advanced python tracing
Trace python statement execution and syscalls invoked during that simultaneously


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