say "some text"
Famously used for getting people back into their apartments,
say takes your arguments and reads them aloud through the audio output device.
pbcopy to interact with the pasteboard (aka clipboard).
# copies the directory listing ls -l | pbcopy # get pasteboard lines containing foo and save them in a_file pbpaste | grep foo > a_file
I think they default to using the macroman encoding, so if you want UTF-8 (which you do) you should check out these links:
Lets you monitor file system activity. Handy if you want to see what files some app creates. See http://rentzsch.com/macosx/fs_usageIntro for more explanation.
From the command line, I like having the ability to:
Create and burn a "universal" CD/DVD:
$ mkisofs -allow-multidot -allow-leading-dots -d -hide-rr-moved \ -l -joliet-long -R -T -v \ -V VOLUME_NAME -o output.iso root-cd-dir/ $ hdiutil burn -noverifyburn output.iso
Create an ISO image from a CD/DVD:
$ diskutil unmountDisk /dev/disk2s0 $ dd if=/dev/disk2s0 of=cdname.iso bs=32m
Being able to forget the otool command when I'm seeking ldd:
$ alias ldd='printf "Sending command to \'\''otool -L\'\'' --\n" && otool -L'
Mount a disk image from the command line:
$ hdid diskimage.dmg (or .iso)
Use preview to access a man page:
$ man -t rsync | open -f -a /Applications/Preview.app
The 'airport' CLI utility is my favorite. See http://osxdaily.com/2007/01/18/airport-the-little-known-command-line-wireless-utility/. It will show you details like the signal level, noise level, and the BSSID of the AP you're associated to.
It can't be said enough, "open" is great. You can open documents in their GUI program and you can select the GUI program with -a as well. For example,
open -a vlc movie.avi
will open VLC and tell it to load movie.avi in your current dir.
would open it with whatever program is the default. If you just want to open a program, you can do that too:
open -a system\ preferences
will run System Preferences. You can open Urls too:
will open Screen Sharing and connect to myserver.
to see all flags you can use.
sudo changeip -checkhostname
Checks that forward and reverse DNS resolution are healthy, and often shows you the command you can use to fix the problem. If it says "the names match, there is nothing to change" you're in good shape. Vital if you ever change your server's network configuration. Also important to use this before you promote your server to an Open Directory Master.
shows who has logged into a system, how long they used it, and when the system has been restarted.
Here is a sample of the output:
clinton ttys000 Thu May 28 22:33 still logged in clinton console Thu May 28 08:05 still logged in reboot ~ Thu May 28 08:05 shutdown ~ Wed May 27 20:15 clinton console Wed May 27 17:33 - 20:15 (02:42) ... wtmp begins Thu May 14 09:26
list open files
Handy when you want to eject your USB drive and are told that it is in use and to please quit all applications and try again.
$ sudo lsof /Volumes/CLINTON COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME bash 55966 clinton cwd DIR 14,12 16384 2 /Volumes/CLINTON lsof 56042 root cwd DIR 14,12 16384 2 /Volumes/CLINTON lsof 56043 root cwd DIR 14,12 16384 2 /Volumes/CLINTON
In this instance, I had
cded onto the drive and so bash was accessing the volume.
Note that if you see 'mds' entries, it means that spotlight is indexing the drive.
While not specifically a Mac resource, it is using the icon for the Terminal, and most of the list of really useful commands will work.
osascript -e 'tell application "AppName" to quit'
Lets you quit an application from the shell.
osascript -e 'tell application "Finder" to sleep'
Useful last line of a long shell script, puts Mac to sleep when script is done. I have it aliased to iSleep.
pbpaste | script.sh |pbcopy
takes contents of pasteboard (edit->copy) and pipes it to script.sh. The results are put onto the pasteboard for you to edit->paste into a document.
this will let you see what sort of MCX (Managed Client) settings are being applied to a client machine.
[The GUI equivalent is to go to System Profiler, and, under the Software section, click on "Managed Client".]
It is useful to determine if a machine is managed and to see if it is getting the settings you expect.
Give you the same results as you get when you choose About This Mac -> More Info, only on the command line.
or looking at the man page will give you tips on how to use it.
A couple of examples:
system_profiler -xml > MySystem.spx # and later, open MySystem.spx # or just double click on it in the Finder
this will dump the system profile to a file which can be looked at later on a different machine.
Tells you about all your USB devices (including their Vendor and Product IDs, which can aid in tracking down drivers).
system_profiler SPUSBDataType | grep "Product ID" -c
will tell you how many USB devices are plugged in (including internal USB devices), which is useful to see if the computer sees a device (or, if, say, Parallel's grabbed it or it is dead.) [Do note that in the System Profiler GUI App, you can choose View -> Refresh from the menu to update the list; that may just be easier.]
will get you basic hardware info (useful for asset tracking), and
system_profiler SPHardwareDataType | grep Serial
will give you the machine's serial number.
dns-sd -B _ssh dns-sd -B _rfb dns-sd -B _services._dns-sd._udp
List servers advertising in Bonjour. The last suggestion lists the types of service that you can list. The listing is live, hit Ctrl-C when you've seen enough.
The same command comes in recent Linuxes and in the Bonjour SDK for Windows.
opendiff file1 file2
Runs FileMerge (a graphical
diff that comes with Apple Developer Tools) on
in Leopard and newer, reports which processes open files, whether successfully or not. You can ask it to look at all files being opened across the system, by a specific process, or if any process is opening a given file, with different sorts of timestamps, and to show if errors occur.
Here are some more details:
opensnoop is a dtrace script; there are many others in /usr/bin that look at things like which system calls a process is making, what processes it is creating and what I/O it is doing. Run
apropos DTrace for a list, and look at man pages for details.
I found out about opensnoop when struggling to diagnose why a Comic Life Magiq 1.1 was crashing on OS 10.5.8 for users with network accounts.
I ran (several times, on different accounts, via ssh):
sudo opensnoop -e -n Comic > output.txt
The last file opened by network users was something like this (with a full path):
which reminded me that Safari 5.0 was crashing for network users, and we worked around it by either managing a preference to not cache favicons or by redirecting a file. Apple apparently fixed the issue in Safari 5.0.1, and when I upgraded to Safari 5.0.2 yesterday, it fixed the crash for Comic Life Magiq users.
sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart -restart -agent
Starts the Remote Desktop service (useful if you only have SSH access but want to do something using the GUI on your client Mac). For more options, see: http://support.apple.com/kb/HT2370