我想在一个ksh脚本(使用exec)中创建一个管道,将管道连接到一个T形管,并将输出发送到管道.
当前：
#Redirect EVERYTHING
exec 3>&1 #Save STDOUT as 3
exec 4>&2 #Save STDERR as 4
exec 1>${Log} #Redirect STDOUT to a log
exec 2>&1 #Redirect STDERR to STDOUT
我想做什么(但我没有正确的语法)：
#Redirect EVERYTHING
exec 3>&1 #Save STDOUT as 3
exec 4>&2 #Save STDERR as 4
exec 1>tee -a ${Log} >&3 #Redirect STDOUT to a log
exec 2>&1 #Redirect STDERR to STDOUT
我怎样才能创建这个管道？
这是我使用的解决方案.它在我的Mac上的ksh下工作.它很好地封装在start_logging()和stop_logging()函数中,使生活变得轻松.
原文链接：https://www.f2er.com/bash/383325.html代码在实践中看起来像这样：
# Optional: # Set the name and location of the log file. # OUTPUT_LOG=output.log # default # Set the name and location of the named pipe used. # OUTPUT_PIPE=output.pipe # default start_logging # Default is to append to an existing log file. # start_logging delete_existing_logfile echo "This is on standard out" echo "This is on standard err" >&2 stop_logging
这是整个文件.启动和停止功能以及上面的示例都位于文件的底部.为了更容易使用,只需将启动和停止功能放在他们自己的文件中,然后在需要记录的脚本中将它们提取出来.
#!/bin/sh
# Author: Harvey Chapman <hchapman _AT_ 3gfp.com>
# Description: POSIX shell functions that can be used with tee to simultaneously put
# stderr and stdout to both a file and stdout
#
# Based on:
# Re: How to redirect stderr and stdout to a file plus display at the same time
# http://www.travishartwell.net/blog/2006/08/19_2220
#
# Original example function from Travis Hartwell's blog.
# Note: I've made minor changes to it.
example()
{
OUTPUT_LOG=output.log
OUTPUT_PIPE=output.pipe
# This should really be -p to test that it's a pipe.
if [ ! -e $OUTPUT_PIPE ]; then
mkfifo $OUTPUT_PIPE
fi
# This should really be -f to test that it's a regular file.
if [ -e $OUTPUT_LOG ]; then
rm $OUTPUT_LOG
fi
exec 3>&1 4>&2
tee $OUTPUT_LOG < $OUTPUT_PIPE >&3 &
tpid=$!
exec > $OUTPUT_PIPE 2>&1
echo "This is on standard out"
echo "This is on standard err" >&2
exec 1>&3 3>&- 2>&4 4>&-
wait $tpid
rm $OUTPUT_PIPE
}
# A slightly reduced version of example()
example2()
{
OUTPUT_LOG=output.log
OUTPUT_PIPE=output.pipe
rm -f $OUTPUT_PIPE
mkfifo $OUTPUT_PIPE
rm -f $OUTPUT_LOG
tee $OUTPUT_LOG < $OUTPUT_PIPE &
tpid=$!
exec 3>&1 4>&2 >$OUTPUT_PIPE 2>&1
echo "This is on standard out"
echo "This is on standard err" >&2
exec 1>&3 3>&- 2>&4 4>&-
wait $tpid
rm -f $OUTPUT_PIPE
}
#
# Logging methods based on above. See the example below for how to use them.
#
# Usage: start_logging [delete_existing_logfile]
start_logging()
{
# Check to see if OUTPUT_LOG and OUTPUT_PIPE need to be defined.
if [ -z "$OUTPUT_LOG" ]; then
OUTPUT_LOG=output.log
fi
if [ -z "$OUTPUT_PIPE" ]; then
OUTPUT_PIPE=output.pipe
fi
# Make sure that we're not already logging.
if [ -n "$OUTPUT_PID" ]; then
echo "Logging already started!"
return 1
fi
# Always remove the log and pipe first.
rm -f $OUTPUT_PIPE
# Delete the logfile first if told to.
if [ "$1" = delete_existing_logfile ]; then
rm -f $OUTPUT_LOG
fi
mkfifo $OUTPUT_PIPE
tee -a $OUTPUT_LOG < $OUTPUT_PIPE &
OUTPUT_PID=$!
exec 3>&1 4>&2 >$OUTPUT_PIPE 2>&1
}
stop_logging()
{
# Make sure that we're currently logging.
if [ -z "$OUTPUT_PID" ]; then
echo "Logging not yet started!"
return 1
fi
exec 1>&3 3>&- 2>&4 4>&-
wait $OUTPUT_PID
rm -f $OUTPUT_PIPE
unset OUTPUT_PID
}
example3()
{
start_logging
#start_logging delete_existing_logfile
echo "This is on standard out"
echo "This is on standard err" >&2
stop_logging
}
#example
#example2
example3
