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Stopping after first line of output

Fresh5 days ago
Mar 15, 20266727 views
Confidence Score0%
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Problem

I try to do the following in a Bash script: run a command (such as ), wait until a specific output arrives, then stop the command, and go on with the script. I tried the following, but it didn't work: I got no output this way. Now, I tried to diagnose the problem. When I simply run , then type some…

Error Output

tail -f log_file | grep some_text | head -n1

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1 Fix

Canonical Fix
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Fix for: Stopping after first line of output

Low Risk

buffers your input. Try . There's an additional problem, will only terminate after it receives a second line which can be a problem if your logfile is low-frequency. See How to read one line from through a pipeline, and then terminate?.

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