osx - terminal.app: how to read the terminal window title

19
2014-04
  • Mario

    I have seen many questions about how to set the tab (or window) name, but how to get it? I have setup terminal to open 8 tabs, each tab having its own name (dev1, dev2, ... dev8) Is there any way for a shell script to identify in which tab it is (read the tab's name?)

  • Answers
  • glenn jackman

    This works on my Fedora box, but I don't have a Mac to verify:

    xprop -id $WINDOWID | grep '^WM_NAME(STRING)' | cut -d\" -f2
    
  • Arjan

    If all else fails, then AppleScript to the rescue:

    title=`osascript -e 'tell application "Terminal" to  get name of front window'`
    echo $title
    

    Beware though when using of front window when using multiple windows. This will print the wrong results when switching to another tab in 5 seconds:

    sleep 5; osascript -e 'tell application "Terminal" to  get name of front window'
    

    (So I hope someone can give you an easier way.)


  • Related Question

    osx - Set the title of the terminal window to the current directory
  • Kare Morstol

    How can I get the Terminal.app in OS X to display the current directory in its window or tab title?

    I'm using the bash shell.


  • Related Answers
  • Darren Hall

    Depends on your shell.

    This article displays multiple methods.

    I personally use zsh which has a convenient precmd() function which is run before each prompt.

        precmd () { print -Pn "\e]2;%n@%M | %~\a" } # title bar prompt
    

    Although the other questions list bash methods, they alias cd. Bash provides an inherent method that chains off just the prompt.

    bash

    bash supplies a variable PROMPT_COMMAND which contains a command to execute before the prompt. This example (inserted in ~/.bashrc) sets the title to "username@hostname: directory":

     PROMPT_COMMAND='echo -ne "\033]0;${USER}@${HOSTNAME}: ${PWD}\007"'
    

    where \033 is the character code for ESC, and \007 for BEL. Note that the quoting is important here: variables are expanded in "...", and not expanded in '...'. So PROMPT_COMMAND is set to an unexpanded value, but the variables inside "..." are expanded when PROMPT_COMMAND is used.

    However, PWD produces the full directory path. If we want to use the '~' shorthand we need to embed the escape string in the prompt, which allows us to take advantage of the following prompt expansions provided by the shell:

    \u          expands to $USERNAME
    \h          expands to hostname up to first '.'
    \w          expands to directory, replacing $HOME with '~'
    \[...\]     embeds a sequence of non-printing characters
    

    Thus, the following produces a prompt of "bash$ ", and an xterm title of "username@hostname: directory" ...

     case $TERM in
         xterm*)
            PS1="\[\033]0;\u@\h: \w\007\]bash\$ "
            ;;
         *)
            PS1="bash\$ "
            ;;
     esac
    

    Note the use of [...], which tells bash to ignore the non-printing control characters when calculating the width of the prompt. Otherwise line editing commands get confused while placing the cursor.

  • Allisone

    Copy & paste into file ~/.profile:
    PROMPT_COMMAND='echo -ne "\033]0; ${PWD##*/}\007"'

    This will set the title of the current terminal tab to the name of the folder you are in (NOT the whole path).
    So...
    Developer/Applications/Utilities/Bluetooth/ becomes => Bluetooth

  • Chris Page

    As of Mac OS X Lion 10.7, Terminal has an explicit escape sequence for setting the working directory, which Terminal displays using the standard window "proxy" icon. This enables you to Command-Click it to see the path, reveal in Finder, or drag it like any other folder. In addition, Terminal can use this to create another terminal at the same directory, and to restore the working directory when quitting/restarting Terminal (when Resume is enabled). It also enables restoring directories for Window Groups.

    It's the same Operating System Command (OSC) escape sequence as for the window and tab titles, but with the first parameter set to 7. The value should be a "file:" URL, which enables percent-encoding special characters so it can handle all valid pathnames. You should also include the hostname so Terminal can determine whether it's a local directory; Terminal will avoid using it as the current working directory if it's from a different host.

    On a related note, Terminal similarly supports setting the "represented file" using the OSC escape sequence with a parameter of 6. If set, the proxy icon will display this instead of the working directory. For example, I have emacs and less configured to reflect the currently displayed file/buffer in the proxy icon. This enables these tty-based programs to be more integrated with the surrounding OS.

    The working directory behaviors are enabled by default for bash (the default shell on Mac OS X). See /etc/bashrc for the relevant code.

    It's also probably worth mentioning that Lion Terminal now supports setting the tab title independently from the window title using the OSC escape sequence.

  • Michael Norrish

    Bash solutions involving PS1 and the PROMPT_COMMAND both fail if the directory has Unicode characters in it (at least on Snow Leopard). The best solution I could come up with was to do the equivalent of

    PS1="\[\033]0;\`pwd | tr -dC '[\000-\177]'\`\007\]\$ "
    

    Unfortunately this doesn't work directly, so instead I defined a shell function to do the tr call:

    termtitlefilter () { tr -dC '[\000-\177]'; }
    PS1="\[\033]0;\`pwd | termtitlefilter\`\007\]\$ "
    

    This works well for Latin accents, which will be in Unicode NFD (the accents will disappear but the underlying Latin character will remain).

    Unfortunately, it will completely fail for things like Chinese.

  • Kare Morstol

    Enter this into your ~/.profile or equivalent file:

    function settitle() { echo -n "]0;$@"; }
    function cd() { command cd "$@"; settitle `pwd -P`; }
    
    export PS1='\W \$ '
    
    settitle `pwd`
    

    The first line contains two special characters that can't be copied/pasted, but you can download the text from here: http://blog.nottoobadsoftware.com/files/setterminaltitle.sh.