How to continuously show command output in bash?

Question

I have a code in my bash script

OUTPUT=""yum update

echo $OUTPUT

echo $OUTPUT >> mylogfile

yum updateis a very long command and without my script it always output something to console, but in my script it starts, for the long time nothing outputs and after a while outputs a lof of data. Is any way in my script to output data as soon as it is available, but not all data in the same time after long waiting?

You are "suffering from buffering". I can't test this, but try redirecting stdout to stderr, which should be unbuffered. yum update >&2 — cdarke
– cdarke, Commented Feb 22, 2013 at 9:44

ckhan · Accepted Answer · 2013-02-22 09:45:53Z

3

Try using tee:

$ yum update | tee mylogfile

will send standard output from yum to both the standard output of shell (your screen) and mylogfile. Add redirections for standard error as needed.

answered Feb 22, 2013 at 9:45

ckhan

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