Hibernate from Terminal

To hibernate from terminal you must use the pmset command. However, pmset only allows you to set the hibernate mode. It does not immediately put your machine to sleep. An example:

sudo pmset -a hibernatemode 25

There are 4 power management options:

  1. -b  —  Battery
  2. -c  —  Charger
  3. -u  —  UPS
  4. -a  —  All of the above

There are a total of 7 hibernation modes. The first 3 modes are standard. The last 4 modes may be used, though they are NOT recommended (as per the pmset man page):

  1. hibernatemode 0 — The system will not back memory up to persistent storage. The system must wake from the contents of memory; the system will lose context on power loss. This is, historically, plain old sleep. In binary, 0000 0000.
  2. hibernatemode 3 —  by default on supported portables. The system will store a copy of memory to persistent storage (the disk), and will power memory during sleep. The system will wake from memory, unless a power loss forces it to restore from disk image. In binary, 0000 0011.
  3. hibernatemode 25 — The system will store a copy of memory to persistent storage (the disk), and will remove power to memory. The system will restore from disk image. If you want “hibernation” – slower sleeps, slower wakes, and better battery life, you should use this setting. In binary, 0001 1001.
  4. hibernatemode 1 — Enables hibernation; causes OS X to write memory state to hibernation image at sleep time. On wake (without bit 1 set) OS X will resume from the hibernation image. Bit 0 set (without bit 1 set) causes OS X to write memory state and immediately hibernate at sleep time. In binary, 0000 0001 (bit 0).
  5. hibernatemode 2 — Causes OS X to maintain system state in memory and leave system power on until battery level drops below a near empty threshold (This enables quicker wakeup from memory while battery power is available). Upon nearly emptying the battery, OS X shuts off all system power and hibernates; on wake the system will resume from hibernation image, not from memory. In binary, 0000 0010 (bit 1 in conjunction with bit 0).
  6. hibernatemode 8 — Encourages the dynamic pager to page out inactive pages prior to hibernation, for a smaller memory footprint. In binary, 0000 1000 (bit 3).
  7. hibernatemode 16 — Encourages the dynamic pager to page out more aggressively prior to hibernation, for a smaller memory footprint. In binary, 0001 0000 (bit 4).

I’ve listed the binary because the command can be executed using the binary instead, which may be easier to remember for the last four options.

Option 5 is a very practical alternative and may be the way apps such as SmartSleep function (Read about SmartSleep in a previous post). However, when I set my SmartSleep setting to to “smart sleep” and then check my hibernate mode using pmset -g, the mode still reads as “0”. At any rate, the concept is similar, if not the same.

To make hibernate mode setting a bit easier to remember, I’ve added the following aliases to my .profile that I can execute on the command line:

alias hibernate='sudo pmset -a hibernatemode 25'
alias sleep='sudo pmset -a hibernatemode 0'
alias safesleep='sudo pmset -a hibernatemode 3'
alias smartsleep='sudo pmset -a hibernatemode 2'

Now I can easily how my system responds when I close my MacBook lid.

There is one final caveat: if you have an app like SmartSleep installed, it will override any hibernate mode settings you make. In testing this, I noticed how I would set hibernatemode 25 and SmartSleep to “smart sleep,” and then when I woke my machine up hibernatemode was set to “0”. Strange, but true.

Leverage Git Config & Autocomplete Git Commands

Git Logo

I’ve already discussed customizing your shell and command prompt. To me, it is equally important to leverage Git configuration and autocomplete Git commands. You should also check out how to show the current Git branch in your Bash prompt.

Git Config

There are a lot of cool things you can do to customize Git just the way you like it. Most of these ideas are personalized versions of the git config customizations found at the Git website.

To create succinct, efficient commands in Git, create aliases for both the shell and for Git. Add the following code snippet to your .profile or .bash_profile:

alias gst='git status'
alias gco='git checkout'
alias gci='git commit'
alias grb='git rebase'
alias gbr='git branch'
alias gpl='git pull'
alias gpu='git push'
alias gad='git add -A'
alias gmt='git mergetool'
alias bdf='git diff'
alias glg='git log --date-order --all --graph --format="%C(green)%h%Creset %C(yellow)%an%Creset %C(blue bold)%ar%Creset %C(red bold)%d%Creset%s"'
alias glg2='git log --date-order --all --graph --name-status --format="%C(green)%h%Creset %C(yellow)%an%Creset %C(blue bold)%ar%Creset %C(red bold)%d%Creset%s"'

Next add the following code to your ~/.gitconfig file:

st = status
co = checkout
ci = commit
rb = rebase
br = branch
pl = pull
pu = push
ad = add
mt = mergetool
df = diff
lg = log --graph --name-status --oneline

Now reload your shell and you’re good to go. I’d also recommend you configure the following settings:

  • Color UI. Adds color to commands like git status so you can read the output more easily. It’s as simple as git config --global color.ui true.
  • Code Editor. I like to use vim, but Sublime would be a great alternative. git config --global core.editor vim.
  • Diff & Merge Tool. I downloaded the DiffMerge app for my MacBook Pro and the P4Merge for my Windows box. These tools allow me to compare code or resolve code conflicts when I run into them. This is worth the time it takes to set up before hand. Read how at Customizing Git – Git Configuration: External Merge and Diff Tools.

Below is what my .gitconfig file looks like now (Updated 2012-09-28):

        name = John Doe
        email = johndoe@doe.com
        st = status
        co = checkout
        ci = commit
        rb = rebase
        br = branch
        pl = pull
        pu = push
        ad = add
        mt = mergetool
        lg = log --graph --name-status --oneline
        editor = vim
        #autocrlf = true
        ui = true
        tool = kdiff3
        ff = true
[mergetool "kdiff3"]
        path = /usr/local/bin/kdiff3
        #path = C:/Program Files (x86)/KDiff3/kdiff3.exe

        guitool = kdiff3
        path = /usr/local/bin/kdiff3
        #path = C:/Program Files (x86)/KDiff3/kdiff3.exe

Autocomplete Git Commands

To add autocomplete for your Git commands, download the git-completion.bash file. The easiest way I know to do it is by using the following curl command in the shell:

curl https://github.com/git/git/raw/master/contrib/completion/git-completion.bash -OL

The -O options tells curl to output a local file with the same name as the remote file. Thus, the name of the file is extracted from the given URL.

The -L option allows curl to redirect if the appropriate location is indicated with a Location: header and a 3XX response code. curl will redo the request using the new location.

Once you get the the git-completion.bash file, find a place to store it permanently. I put mine with the rest of my shell scripts in ~/bin. Then add the following code snippet to your .profile or .bash_profile file:

source ~/git-completion.bash