Use grep -E instead of egrep (#401)

Author: a1346054

Diff for: FAQ.md

@@ -9,7 +9,7 @@ This will show the window ID in hexadecimal of
 a window with title `My dialog title`:
 
 ```
-wmctrl -l | egrep "My dialog title" | cut -f 1 -d ' '
+wmctrl -l | grep "My dialog title" | cut -f 1 -d ' '
 ```
 
 I got the value of `0x02800003` displayed on my screen, 
@@ -18,7 +18,7 @@ but you will probably have a different value.
 Feeding that hexadecimal value to `xdotool` does activate the window:
 
 ```
-xdotool windowactivate $(wmctrl -l | egrep "My dialog title" | cut -f 1 -d ' ')
+xdotool windowactivate $(wmctrl -l | grep "My dialog title" | cut -f 1 -d ' ')
 ```
 
 ## How to let `xdotool` work with Qt applications?
@@ -31,10 +31,10 @@ If something is wrong, a workaround is to use `wmctrl`
 to obtain the window ID:
 
 ```
-xdotool windowactivate $(wmctrl -l | egrep "My dialog title" | cut -f 1 -d ' ')
+xdotool windowactivate $(wmctrl -l | grep "My dialog title" | cut -f 1 -d ' ')
 ```
 
 Replace 'My dialog title' for the window name you are looking for.
 
 Note that `wmctrl` displays the window ID in hexadecimal. This is no
-problem for `xdotool`!
+problem for `xdotool`!

Diff for: t/ephemeral-x.sh

@@ -168,7 +168,7 @@ if [ ! -z "$WINMGR" -a "$WINMGR" != "none" ] ; then
   for i in 1 2 3 4 5 6 7 8 9 10 ABORT ; do 
     # A good signal that the WM has started is that the WM_STATE property is
     # set or that any NETWM/ICCCM property is set.
-    if xprop -root | egrep -q 'WM_STATE|^_NET' ; then
+    if xprop -root | grep -qE 'WM_STATE|^_NET' ; then
       quiet || echo "$WINMGRNAME looks healthy. Moving on."
       break;
     fi