How do I redirect stderr and stdout to file for a Ruby script?
如何将stderr和stdout重定向到Ruby脚本的文件中?
4 个解决方案
#1
58
From within a Ruby script, you can redirect stdout and stderr with the IO#reopen method.
在Ruby脚本中，可以使用IO# restart方法重定向stdout和stderr。
# a.rb
$stdout.reopen("out.txt", "w")
$stderr.reopen("err.txt", "w")
puts 'normal output'
warn 'something to stderr'
$ ls a.rb $ ruby a.rb $ ls a.rb err.txt out.txt $ cat err.txt something to stderr $ cat out.txt normal output
#2
13
Note: reopening of the standard streams to /dev/null is a good old method of helping a process to become a daemon. For example:
注意:重新打开到/dev/null的标准流是帮助进程成为守护进程的一种很好的老方法。例如:
# daemon.rb
$stdout.reopen("/dev/null", "w")
$stderr.reopen("/dev/null", "w")
#3
7
def silence_stdout
$stdout = File.new( '/dev/null', 'w' )
yield
ensure
$stdout = STDOUT
end
#4
5
./yourscript.rb 2>&1 > log.txt
will redirect stdout and stderr to the same file.
将stdout和stderr重定向到同一个文件。
#1
58
From within a Ruby script, you can redirect stdout and stderr with the IO#reopen method.
在Ruby脚本中，可以使用IO# restart方法重定向stdout和stderr。
# a.rb
$stdout.reopen("out.txt", "w")
$stderr.reopen("err.txt", "w")
puts 'normal output'
warn 'something to stderr'
$ ls a.rb $ ruby a.rb $ ls a.rb err.txt out.txt $ cat err.txt something to stderr $ cat out.txt normal output
#2
13
Note: reopening of the standard streams to /dev/null is a good old method of helping a process to become a daemon. For example:
注意:重新打开到/dev/null的标准流是帮助进程成为守护进程的一种很好的老方法。例如:
# daemon.rb
$stdout.reopen("/dev/null", "w")
$stderr.reopen("/dev/null", "w")
#3
7
def silence_stdout
$stdout = File.new( '/dev/null', 'w' )
yield
ensure
$stdout = STDOUT
end
#4
5
./yourscript.rb 2>&1 > log.txt
will redirect stdout and stderr to the same file.
将stdout和stderr重定向到同一个文件。