Commands by k00pa (1)

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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Convert all MySQL tables and fields to UTF8
This loops through all tables and changes their collations to UTF8. You should backup beforehand though in case some data is lost in the process.

list ips with high number of connections

Get your mac to talk to you
Very entertaining when run on someone elses machine remotely ;)

Read a tcpdump file and count SYN packets to port 80, Order column by destination.

Run a command when a file is changed

Lists architecture of installed RPMs
Lists all installed RPM packages with name and architecture, which is useful to check for compability packages (+ required i386 packages) on a 64bit system.

Convert epoch date to human readable date format in a log file.

Convert PDF to JPEG using Ghostscript
Converting your PDF file to JPEG images. You can set resolution by -r option (default: 72dpi).

Realtime lines per second in a log file
Using tail to follow and standard perl to count and print the lps when lines are written to the logfile.


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