Verify Xcode Command Line Tools Install in Bash Script

Question

I am creating a bash script to setup a development environment. As part of my script I need to install Xcode Command Line Tools and I don't want the script to continue execution until the installation has been completed.

When I run:

xcode-select --install

It prints that an install has been requested or that it has already been installed. I want to be able to wait until the message changes to already being installed.

The relevant part of my script is as follows:

check="$(xcode-\select --install)"
echo "$check"
str="xcode-select: note: install requested for command line developer tools\n"
while [[ "$check" == "$str" ]];
do
    check="$(xcode-\select --install)"
    sleep 1
done

Unfortunately $check is always empty because xcode-select --install does not return anything and instead echoes the message to the terminal.

Is it outputting that message to standard error? Does xcode-select --install 2>&1 help? — Etan Reisner
– Etan Reisner, Commented May 29, 2015 at 15:52
In the "... relevant part of my script ..." you have check="$(xcode-\select --install)", shouldn't that be check="$(xcode-select --install)"? in other words, no backslash between the - and s in xcode-select. — user3439894
– user3439894, Commented May 29, 2015 at 16:03
Without the slash I got errors in the rest of my script because select is a reserved word in bash — Teddy Sterne
– Teddy Sterne, Commented May 29, 2015 at 16:30
Interesting, I'm using OS X too and it does not throw an error for me without the backslash, in a script or from the command line. — user3439894
– user3439894, Commented May 29, 2015 at 17:17

skandebaba · Accepted Answer · 2016-01-26 00:30:08Z

2

I know you have probably already solved this issue, I had a crack at this problem today, and discovered that it prints to stderr and not stdout. This is the code I used to determine whether Xcode is installed or not:

check=$((xcode-\select --install) 2>&1)
echo $check
str="xcode-select: note: install requested for command line developer tools"
while [[ "$check" == "$str" ]];
do
  osascript -e 'tell app "System Events" to display dialog "xcode command-line tools missing." buttons "OK" default button 1 with title "xcode command-line tools"'
  exit;  
done

Hope this helps someone in the future :)

answered Jan 26, 2016 at 0:30

skandebaba

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