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I have a process which logs output to log.txt. If I want to see the process's status in real-time, is there a way to echo that output to stdout instead of opening the log in a text editor and constantly reloading?

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3 Answers 3

up vote 7 down vote accepted

For a really simple solution at the Terminal:

% tail -f log_file.log

From the tail mainfile (i.e. man tail):

 -f      The -f option causes tail to not stop when end of file is reached,
         but rather to wait for additional data to be appended to the input.
         The -f option is ignored if the standard input is a pipe, but not if
         it is a FIFO.

 -F      The -F option implies the -f option, but tail will also check to see
         if the file being followed has been renamed or rotated.  The file is
         closed and reopened when tail detects that the filename being read
         from has a new inode number.  The -F option is ignored if reading
         from standard input rather than a file.
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use tail -f to display the end of a file, and "follow" it as it grows.

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Use:

tail -f log.txt

or in a different flavor:

watch tail log.txt
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