All commands

EDIT: command updated to support accented characters!

Works in any of 58 google supported languages (some sound like crap, english is the best IMO).

You get a mp3 file containing your query in spoken language. There is a limit of 100 characters for the "q" parameter, so be careful. The "tl" parameter contains target language.

This is how I typically grep. -R recurse into subdirectories, -n show line numbers of matches, -i ignore case, -s suppress "doesn't exist" and "can't read" messages, -I ignore binary files (technically, process them as having no matches, important for showing inverted results with -v)

I have grep aliased to "grep --color=auto" as well, but that's a matter of formatting not function.

youtube-dl has this functionality built in. If you're running an older version of youtube-dl, you can update it using `youtube-dl -U` (although if you have an older version, it probably doesn't download youtube videos anyway.)

youtube-dl --help will show you other options that may come in useful.

Ever ask yourself "How much data would be lost if I pressed the reset button?"

Scary, isn't it?

Negative shell globs already come with bash. Make sure to turn on extended pattern matching with 'shopt -e extglob'.

show only the name of the apps that are using internet

This uses Bash's "process substitution" feature to compare (using diff) the output of two different process pipelines.

Get your colorized grep output in less(1). This involves two things: forcing grep to output colors even though it's not going to a terminal and telling less to handle those properly.

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

If you spend most of your time in front of the terminal, leave is a useful reminder. Leave can have absolute form: leave 1555 reminds you to leave at 3:55PM

remotely connects to an https site, fetches the ssl certificate and displays the valid dates for the cert

Print all columns except the 1st and 3rd.

SSH can be controlled trough an ~ escape sequence. Example, to terminate the current ssh connection, type a newline, then the ~ character, and last a . character.

This is useful eg when an ssh connection hangs after you reboot a machine and the connection hangs.

Even faster without the need for cut... :)

~$ tar --version

tar (GNU tar) 1.20

Find files in a specific date range - in this case, the first half of last year.

-newermt = modification time of the file is more recent than this date

GNU find allows any date specfication that GNU date would accept, e.g.

or

just make some data scrolling off the terminal. wow.

Much simpler method. More portable version: ssh host -l user "`cat cmd.txt`"

If you want to be notified when a long-running command is finished, but you have already started it:

CTRL+Z

I use a script to post a tweet, which sends me a txt:

CCZE is a robust and modular log coloriser, with plugins for apm, exim, fetchmail, httpd, postfix, procmail, squid, syslog, ulogd, vsftpd, xferlog and more.

Examples:

tail -f /var/log/messages | ccze -A

tail -f /var/log/exim4/mainlog | ccze -A

If you're a moron like me, sometimes your fingers get away from you and you, for example, enter your password when you're already authenticated to ssh-agent, sudo, etc., and your password ends up in shell history. Here's how to get it out.