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Find files and calculate size of result in shell
Find files and calculate size with stat of result in shell

count files by type
displays a list of all file extensions in current directory and how many files there are of each type of extension in ascending order (case insensitive)

replace a character/word/string in a file using vim
Replace all ocurrences in the file. The g option is to replace more than one occurrence in the same line. Whitout the g option, it only replace the first occurrence in the line.

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.

Save a copy of all debian packages in the form in which they are installed and configured on your system
A copy of all installed debian packages on your system will be put back together, with all changes in configuration files you made and placed in the current directory. Make sure you have enough disk space (say 2-3 GB). Break any time with Ctrl+C.

Console clock
A console clock with the current time.

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

Using mplayer to play the audio only but suppress the video

open two files on top of each other in vim (one window, two panes)


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