Question

我正在使用Shell脚本来运行我的分析。为了确保能正确执行命令，我将完整的STDOUT / STDERR输出写入文件中

我的脚本如下：

#!/bin/bash

# Here are some pliminary stuff

echo " this goes still to the STDOUT to control the begining of the script"

#### execute all output to log files
# to set a log file, where all echo command will be redirected into.
touch $projectName\_logfile.txt # creating the log file
exec &> $projectName\_logfile.txt # direct all output to the log file

echo "1. These steps should be written to the log file"

# exit 
# exec >&-

echo "2. 2. these steps should be written to the STDOUT again!"

# The script should be able to continue here ...

如您所见，我既尝试使用exit命令，又尝试使用exec关闭文件描述符。但是两者都失败了。

感谢您的帮助，以帮助您了解如何关闭与日志文件的连接并将所有内容重定向回STDOUT / STDERR。

谢谢阿萨

Answer 1

我宁愿这样考虑：

echo "to out 1"
{
  echo "to log 1"
  echo "to log 2"
} &> ./_logfile.txt 
echo "to out 2"

无论如何，如果您仍然需要使用您的方法，那么您需要保存原始文件描述符：

exec 3<&1 # save original stdout to 3
exec 4<&2 # save original stderr to 4

然后还原：

exec 1>&3 # restore original stdout
exec 2>&4 # restore original stderr

您的示例：

#!/bin/env bash

echo " this goes still to the STDOUT to control the begining of the script"

touch ./_logfile.txt # touch the log file
exec 3<&1 # save original stdout to 3
exec 4<&2 # save original stderr to 4
exec &> ./_logfile.txt # direct all out and err to the log file

echo "1. These steps should be written to the log file"

exec 1>&3 # restore original stdout
exec 2>&4 # restore original stderr

echo "2. 2. these steps should be written to the STDOUT again!"

# The script should be able to continue here ...

如何终止shell脚本中的日志记录过程并停止脚本？

1 个答案: