Christophe Demarey

Top 10 process using the most memory

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top 10 process using the most memory:

(:source lang=bash :) ps aux --sort=-%mem | awk 'NR<=10{print $0}'

It will list files having a size > 4000k in /.

List installed packages

(:source lang=bash :) dpkg -l | grep '^ii' (:sourceend:)

It will give the top ten of big folders sorted by size (in Mb) descending.

Find big files

(:source lang=bash :) find /-size +4000k -exec ls -lia {} \; (:sourceend:) It will list files having a size > 4000k in /.

Find big folders in a file system

(:source lang=bash :) du -hms /* | sort -nr | head (:sourceend:) It will give the top ten of big folders sorted by size (in Mb) descending.

It will forward all incoming data from localhost:13306 to server.org:3306.

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List open ports

(:source lang=bash :) netstat -lnptu

(:source lang=bash :) find . -name Makefile | xargs grep pattern (:sourceend:)

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How to search a pattern in a set of files

The best option is to use find to construct the set of files and then use grep.

  find . -name Makefile | xargs grep pattern

ssh -L 13306:localhost:3306 user@server.org

Some web servers are only available through a gateway. To access it from your computer, you can also use a SSH tunnel: (:source lang=bash :) ssh -L 8080:webserver:80 gw (:sourceend:)

How to set up an SSH tunnel?

(:source lang=bash :) ssh -L [tunnel-in-port]:[client-host]:[tunnel-out-port] [user@host-to-reach] (:sourceend:) Example: (:source lang=bash :) ssh -L 2080:localhost:80 user@webserver.org (:sourceend:) It will forward all incoming data from localhost:2080 to webserver.org:80.