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  1. #1

    Member Since
    Mar 20, 2009
    noob shell scripting question
    Hi all,

    Just got this book on shell scripting and thought I'd give it a go.

    Here's my script:

    #! /bin/sh
    # titleterm - tells Terminal to change its title to the specified value
    if [ $# != 1 ]; then
      echo "Usage: $0 title" >&2
      exit 1
      echo -n "\033]0;$1\007"
    exit 0
    My problem is with the "-n" option in the second echo command... if I run echo in the command prompt the "-n" option works as advertised, but in the script, -n is interpreted as the string "-n" and not as an option. I'm guessing it's a syntax issue... any suggestions?


  2. #2

    Member Since
    Mar 15, 2007
    17" MacBook Pro, 2.33GHz C2D, 2GB RAM
    From the man page for echo(1):

    "Some shells may provide a built-in echo command which is similar or identical to this utility. Most notably, the built-in echo in sh(1) does NOT accept the -n option. Consult the builtin(1) manual page."

    You can get the -n option to work if you change to using /bin/bash as the shell rather than /bin/sh (in the first line of your script), or else if you invoke /bin/echo via its explicit path to avoid using the built-in version while continuing to use the standard Bourne shell.

  3. #3

    Member Since
    Mar 20, 2009
    ah I see. Thanks for the pointer!

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