For the inplace extension, add inplace variable to control whether it's active.

1 files changed, 16 insertions, 2 deletions

diff --git a/awklib/eg/lib/inplace.awk b/awklib/eg/lib/inplace.awk
index d1574654..15a83f58 100644
--- a/awklib/eg/lib/inplace.awk
+++ b/awklib/eg/lib/inplace.awk
@@ -5,15 +5,29 @@
 # Please set INPLACE_SUFFIX to make a backup copy.  For example, you may
 # want to set INPLACE_SUFFIX to .bak on the command line or in a BEGIN rule.
 
+# By default, each filename on the command line will be edited inplace.
+# But you can selectively disable this by adding an inplace=0 argument
+# prior to files that you do not want to process this way.  You can then
+# reenable it later on the commandline by putting inplace=1 before files
+# that you wish to be subject to inplace editing.
+
 # N.B. We call inplace_end() in the BEGINFILE and END rules so that any
 # actions in an ENDFILE rule will be redirected as expected.
 
+BEGIN {
+    inplace = 1		# enabled by default
+}
+
 BEGINFILE {
     if (_inplace_filename != "")
         inplace_end(_inplace_filename, INPLACE_SUFFIX)
-    inplace_begin(_inplace_filename = FILENAME, INPLACE_SUFFIX)
+    if (inplace)
+        inplace_begin(_inplace_filename = FILENAME, INPLACE_SUFFIX)
+    else
+        _inplace_filename = ""
 }
 
 END {
-    inplace_end(FILENAME, INPLACE_SUFFIX)
+    if (_inplace_filename != "")
+        inplace_end(_inplace_filename, INPLACE_SUFFIX)
 }