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check open ports without netstat or lsof

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

backup a directory in a timestamped tar.gz
creates a tar.gz with a name like: backup20090410_173053.tar.gz of a given directory. this file was made 10 April 2009 at 5:30:53pm see date's man page to customize the timestamp format

Runs previous command but replacing
Replaces the first instance of 'foo' with 'bar'. To replace all instances of 'foo' with 'bar': !!:gs/foo/bar/

live ssh network throughput test
connects to host via ssh and displays the live transfer speed, directing all transferred data to /dev/null needs pv installed Debian: 'apt-get install pv' Fedora: 'yum install pv' (may need the 'extras' repository enabled)

exit without saving history
this exits bash without saving the history. unlike explicitly disabling the history in some way, this works anywhere, and it works if you decide *after* issuing the command you don't want logged, that you don't want it logged ... $$ ( or ${$} ) is the pid of the current bash instance this also works perfectly in shells that don't have $$ if you do something like $ kill -9 `readlink /proc/self`

determine if tcp port is open
Requires netcat.

Re-use the previous command output
The $(!!) will expand to the previous command output (by re-running the command), which becomes the parameter of the new command newcommand.

Share your terminal session real-time
One person does `mkfifo foo; script -f foo' and another can supervise real-time what is being done using `cat foo'.

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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