Commands by Itsdani (0)

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Find 'foo' string inside files

Show LAN IP with ip(8)
$ ip address show | grep eth0 | sed '1d' | awk '{print $2}' does the same, but shows network-prefix.

Right-align text in console using pipe like ( command | right )

Remove specific versions of old kernels (Ubuntu/Debian)
If, for example, you want to remove all kernels and headers but the last three versions, you can't use one of that magic all-in-one "remove old stuff" commands. With this simple but elegant command you can remove a range of versions, or a list of versions with e.g. {14,16,20}.

cd into another dir to run a one-liner, but implicitly drop back to your $OLD_PWD after
Obviously the example given is necessarily simple, but this command not only saves time on the command line (saves you using "cd -" or, worse, having to type a fully qualified path if your command cd's more than once), but is vital in scripts, where I've found the behaviour of "cd -" to be a little broken at times.

Mount file system using back-up superblock
Found on http://www.cyberciti.biz/faq/linux-find-alternative-superblocks/

Run command in an ftp session
By putting ! in front of a command, we are able to run it from an ftp session.

save date and time for each command in history
Date-time format: YYYY-MM-DD HH:MM:SS

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

extracts 64 bytes of random digits from random lines out of /dev/random sent to stdio
Use this the next time you need to come up with a reasonably random bitstring, like for a WPA/WPA2 PSK or something. Takes a continuous stream of bytes coming from /dev/urandom, runs it through od(1), picking a random field ($0 and $1 excluded) from a random line and then prints it.

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