Create a 7zip archive named "some_directory.7z" and adds to it the directory "some_directory". The `-mhe=on` is for header encryption, basically it mangles the file names so no one knows whats inside the 7z. If -mhe=on wasn't included, then a person without the password would still be able to view the file names inside the 7z. Having this option ensures confidentiality. To ensure the result is small use lzma2, level 9 compression. Lzma2 fast bytes range from 5 to 272, the higher the number the more aggressive it is at finding repetitive bytes that can be added to the dictionary. Here the fast bytes are set to 64 bytes and the dictionary is 32 MB. Depending on your purposes (the directory size and desired file size), you can be more aggressive with these values. Lastly, `-ms=on` just says concatenate all the individual files and treat them as a singular file when compressing. This leads to a higher compression ratio generally.

rename a pattern matched files by stripping off the extension

depends on libjpeg-progs But how to display path to found comments? Show Sample Output

You can flexibly change file pattern(*.tar.gz) and uncompress command to other job! Example, remove all files : for i in *.tar.gz; do rm $i; done (Just for example, because if you really want to remove file, simply use wildcard like this rm *.tar.gz)

say you want to edit your PATH variable using bash/zsh commandline editing, this will put something like this in history so you can edit it: PATH=/bin:/usr/bin:/usr/sbin to make this a shell function such that: eev HOME will put /home/dave in the last history event: eev() { print -s "$1='$(eval echo \$$1)'" }

Filters out all non-insert SQL operations (we couldn't filter out only lines starting with "INSERT" because inserts can span multiple lines), quotes table names with backticks, saves dump to a file and pipes it straight to mysql. This transfers only data--it expects your schema is already in place. In Ruby on Rails, you can easily recreate the schema in MySQL with "rake db:schema:load RAILS_ENV=production".

a simple command in order to make iptables rules permanent, run @ sudo!

Nice command for when you don't have scp available for whatever reason. Works with binaries.

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Replace "4158575309@txt.att.net" with your carrier's SMS gateway identifier. The one in the sample is for AT&T. More here https://en.wikipedia.org/wiki/List_of_SMS_gateways. Helpful for getting notifications about long running commands. ";" executes regardless of exit status of last command. && will only notify you if the command succeeds.

Starts a detached screen with the given screen-name. Can be useful for automatic started scripts and init.d-scripts.

This command will install phpmyadmin, set apache2 server and restart apache2. After running this command you can open phpmyadmin on http://yoursite.com/phpmyadmin

schema & tables To export into another backends style, just change backend to one of: access, sybase, oracle, postgres, mysql and sqlite Show Sample Output

Remove duplicate line in a text file.

Requires jhead. See http://www.sentex.net/~mwandel/jhead/

wait nginx processes. Show Sample Output

This is a alternate command I like to use instead of TOP or HTOP to see what are the processes which are taking up the most memory on a system. It shows the username, process ID, CPU usage, Memory usage, thread ID, Number of threads associated with parent process, Resident Set Size, Virtual Memory Size, start time of the process, and command arguments. Then it's sorted by memory and showing the top 10 with head. This of course can be changed to suit you needs. I have a small system which is why Firefox is taking so much resources. Show Sample Output

Requires Powershell Core on Linux or on Windows Powershell 3.0 Gets the direct url for the most recent version of Java JRE. The package is for 64-bit RPM-based systems. Show Sample Output

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yt2mp3(){ for j in `seq 1 301`;do i=`curl -s gdata.youtube.com/feeds/api/users/$1/uploads\?start-index=$j\&max-results=1|grep -o "watch[^&]*"`;ffmpeg -i `wget youtube.com/$i -qO-|grep -o 'url_map"[^,]*'|sed -n '1{s_.*|__;s_\\\__g;p}'` -vn -ab 128k "`youtube-dl -e ${i#*=}`.mp3";done;} squeezed the monster (and nifty ☺) command from 7776 from 531 characters to 284 characters, but I don't see a way to get it down to 255. This is definitely a kludge!

find the PIDs for all the process which include myprog.

Make sure the file you use in your test is > 50mb to get good results. Dependancies: sudo apt-get install lftp iperf Show Sample Output