help message

git-svn-id: svn://tug.org/texlive/trunk@11241 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 18 insertions, 3 deletions

diff --git a/Master/tl-portable b/Master/tl-portable
index 47151860a77..feba0264816 100755
--- a/Master/tl-portable
+++ b/Master/tl-portable
@@ -1,8 +1,23 @@
 #! /bin/sh
+# $Id$
 # Copyright 2008 Siep Kroonenberg.
 # You may freely use, modify and/or distribute this file.
 
-#calculate TeXLive root
+if test "x$1" = x--help; then
+  cat <<END_USAGE
+Usage: tl-portable
+Start a new subshell with the environment set so TeX Live
+can be run with minimal impact on the host, that is,
+run more or less directly from DVD or USB.
+
+For more, see the "Maximally portable" section in the TeX Live
+documentation (http://tug.org/texlive).
+END_USAGE
+
+  exit 0
+fi
+
+#calculate TeX Live root
 #it appears that dirname isn't always available
 TEXDIR0=$0
 TEXDIR=${TEXDIR0%/*}
@@ -17,7 +32,7 @@ TEXDIR=`pwd`
 export TEXDIR
 cd $dirsave
 
-# Test whether the TeXLive directory is writable.  We need an actual
+# Test whether the TeX Live directory is writable.  We need an actual
 # write test, because network drives aren't always identified
 # correctly.  We accept negatives at face value.
 
@@ -81,7 +96,7 @@ elif test ! -d $TEXDIR/bin/$platform; then
 fi
 
 if $TEXDIR/install-tl --portable; then :; else
-  echo Initialization of TeXLive failed!
+  echo "$0: Initialization of TeX Live failed!" >&2
   exit 1
 fi