= 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
# now STDERR is redirected
exec 2>&4
# generate output to STDOUT, it will also write to $TARGET
date
echo "Date sent to fd4."
# generate output to STDERR, it will also write to $TARGET
abc
}}}