Changes between Version 1 and Version 2 of jazz/10-07-22

Timestamp:

Jul 22, 2010, 4:26:45 PM (14 years ago)

Author:

jazz

Comment:

--

jazz/10-07-22

@@ +1 @@
+= 2010-07-22 =
+
+ * [備忘] 重新改用 root 身份執行的 shell script
 {{{
+#!sh
 [ "`id -u`" != "0" ] && exec sudo su -c "$0" "$@"
 }}}
+ * [備忘] 讓標準輸出(STDOUT)與標準錯誤(STDERR)導入到 log 檔的 bash script 寫法
 {{{
+#!sh
+#! /bin/bash
+
+TARGET="target-file"
+
+# file descriptor 4 prints to STDOUT and to TARGET
+exec 4> >(while read a; do echo $a; echo $a >>$TARGET; done)
+
+# now STDOUT is redirected
+exec >&4
+exec 2>&4
+date
+echo "Date sent to fd4."
+abc
+
 }}}