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changeset 321:c64406cdcee1

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nearly works
author Jeff Hammel <jhammel@mozilla.com>
date Sat, 08 Jun 2013 08:26:37 -0700
parents 5a0009051b13
children 19b5bf66ba4e
files bin/example/self-writing.sh
diffstat 1 files changed, 11 insertions(+), 2 deletions(-) [+]
line wrap: on
line diff
--- a/bin/example/self-writing.sh	Sat Jun 08 07:33:06 2013 -0700
+++ b/bin/example/self-writing.sh	Sat Jun 08 08:26:37 2013 -0700
@@ -1,6 +1,15 @@
 #!/bin/bash
 
 # illustrate self-writing script (example)
+# This one does something hard and replaces dynamic data with sed.
+# Other solutions (magic markers, etc) are possible
 
-path=`readlink $0`
-tmp=`tempfile`
\ No newline at end of file
+path=`readlink -f $0`
+tmp=`tempfile`
+datestamp=`date`
+nonce="This script regenerated at "
+
+# avoiding -i for safety
+sed 's/\(echo \"'"${nonce}"'\).*\"/\1'"${datestamp}"'\"/' ${path} > ${tmp}
+
+echo "This script regenerated at "
\ No newline at end of file