Check if Zsh is installed prior to installing Oh My Zsh

Check if Zsh is installed before installing anything else. New-commers, or people who don't read the disclaimers(ex. me) will go straight to stack overflow if chsh -s returns an error.

Check if Zsh is installed prior to installing Oh My Zsh
58d2f933 · Chang Hyun Park · 3d5b3430 · 58d2f933
Commit 58d2f933 authored Aug 12, 2015 by Chang Hyun Park
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install.sh tools/install.sh +7 -0

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--- a/tools/install.sh
+++ b/tools/install.sh
 set -e

+CHECK_ZSH_INSTALLED=$(grep /zsh$ /etc/shells | wc -l)
+if [ ! $CHECK_ZSH_INSTALLED -ge 1 ]; then
+  echo "\033[0;33m Zsh is not installed!\033[0m Please install zsh first!"
+  exit
+fi
+unset CHECK_ZSH_INSTALLED
+
 if [ ! -n "$ZSH" ]; then
  ZSH=~/.oh-my-zsh
 fi