Commands tagged bash tricks (25)

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Show your current network interface in use

Using scapy to get the IP of the iface used to contact local gw (i.e. supposed host IP)
You need python-scapy package

histogram of file size

kill all processes using a directory/file/etc
This command will kill all processes using a directory. It's quick and dirty. One may also use a -9 with kill in case regular kill doesn't work. This is useful if one needs to umount a directory.

continuously check size of files or directories

Kill processes that have been running for more than a week

find out which directories in /home have the most files currently open

check open ports
Tested in Linux and OSX

Sort contents of a directory with human readable output
Show sizes of all files and directories in a directory in size order. $du -hs * | sort -hr for reverse order. Taken from http://serverfault.com/questions/62411/how-can-i-sort-du-h-output-by-size

get a mysqldump with a timestamp in the filename and gzip it all in one go
Performs a mysqldump and gzip-compresses the output file with a timestamp in the resulting dump file. Inspect the file for integrity or fun with this command afterward, if you desire: $ zcat mysqldump-2009-06-12-07.41.01.tgz | less


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