_realcommand: Try greadlink before readlink (Alioth: #313659).

Some systems' readlink does not have -f, but may have the GNU readlink which does installed as greadlink.
scop · May 30, 2012 · 32f2239 · 32f2239
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commit 32f2239
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diff --git a/bash_completion b/bash_completion
@@ -1274,6 +1274,8 @@ _realcommand()
     type -P "$1" > /dev/null && {
         if type -p realpath > /dev/null; then
             realpath "$(type -P "$1")"
+        elif type -p greadlink > /dev/null; then
+            greadlink -f "$(type -P "$1")"
         elif type -p readlink > /dev/null; then
             readlink -f "$(type -P "$1")"
         else

diff --git a/test/lib/library.exp b/test/lib/library.exp
@@ -799,6 +799,8 @@ proc realcommand {cmd} {
     if [string length [set path [auto_execok $cmd]]] {
         if {[string length [auto_execok realpath]]} {
             set result [exec realpath $path]
+        } elseif {[string length [auto_execok greadlink]]} {
+            set result [exec greadlink -f $path]
         } elseif {[string length [auto_execok readlink]]} {
             set result [exec readlink -f $path]
         } else {